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Innocent/Good Majin Boo
This fat form of Boo is the first version of the character that appears in the series. But the annoying thing about this form is that it’s technically two forms in one. There’s the initial Boo who comes out of the ball and fights with Majin Vegeta and SSj3 Goku (labeled “Innocent Majin Boo” by the daizenshuu, but more on that later). But once this Boo expels his evil half, he becomes “Good Boo”, who later changes his name to “Mister Boo” in the manga. Innocent Boo and Good Boo look exactly the same, but Good Boo has an actual sense of right and wrong (taught to him by, appropriately enough, Satan), and doesn’t have nearly as much power as Innocent Boo, since the evil half took the majority of the power when the two split. However, guides, video games, and fans have rather understandably tended to lump Innocent Boo and Good Boo together. So any name that’s applied to one will likely end up getting applied to the other somewhere or other.
Manga
Being the first form of Boo to appear, Innocent Boo is referred to as simply “Majin Boo” most of the time he’s around. In chapter 485 of the manga, after Innocent Boo ejects Pure Evil Boo from his body, the narrator refers to him as both “the original Majin Boo” (元祖魔人ブウ/ganso Majin Buu) and “the innocent Majin Boo” (無邪気な魔人ブウ/mujaki na Majin Buu). The later obviously seems to be where the daizenshuu got the name “Innocent Boo” from, though the narrator uses it to describe the form of Boo which the daizenshuu would technically label “Good Boo”, since it’s after he expelled his evil side. When Goku and Vegeta discover Good Boo inside of Evil Boo’s body in chapter 506, Goku refers to him as “Majin Boo! The very first one of all!” (魔人ブウ! いちばん最初のやつ/Majin Buu! Ichiban saisho no yatsu). In chapters 507, 514, and 515, Vegeta distinguishes Good Boo from the other forms of Boo by calling him “the fatso” (デブの方/debu no hou or simply デブ/debu). Meanwhile, Goku refers to Good Boo as “the fat Majin Boo” (太っちょの魔人ブウ/futoccho no Majin Buu) in chapter 508, and Dende uses the same name in chapter 509. The title page for chapter 518 explains that ten years after the battle with Evil Boo, Good Boo now goes by “Mister Boo” rather than “Majin Boo”. Note that this is the English word “Mister” (ミスターブウ/Misutaa Buu), just like with Mister Satan, though Boo does get called “Boo-san” (the Japanese equivalent of “Mister Boo) a few times during the final two chapters.
Guidebooks
The naming scheme for Boo’s forms used in most guidebooks and all recent Japanese video games wasn’t actually developed until Daizenshuu 4. In Daizenshuu 2’s All Battles list, for instance, Innocent Boo is simply called “Majin Boo”, Good Boo is labeled “Majin Boo (good)”, while Pure Evil Boo, Evil Boo, and Pure Boo are all lumped together as “Majin Boo (evil)”. The Daizenshuu 4 chart of Boo’s transformation is the first place we see the label 魔人ブウ (無邪気)/Majin Buu (mujaki), “Majin Boo (innocent)” and 魔人ブウ (善)/Majin Buu (zen) “Majin Boo (good)”. It should be noted that Good Boo is never actually described as “good” in the manga. The entry for Bee in the “Animals and Monsters” section also uses the term “Majin Boo (innocent)”, but apart from that the Innocent/Good distinction hasn’t been all used that much. In Daizenshuu 7 Innocent Boo is lumped in with Good Boo in the technique dictionary and elsewhere, though otherwise the book uses the same naming scheme for Boo’s forms as Daizenshuu 4. The Super Exciting Guide: Character Volume uses Daizenshuu 4’s distinction between Innocent and Good Boo in its own chart of Boo’s transformations, and the SEG: Character Volume uses the term “Innocent Majin Boo” as well. The SEG: Character Volume's page for Majin Boo also refers to Innocent Boo as "Dai Kaioshin-absorbed", the same naming scheme used for Boo's Gotenks and Gohan forms, which I think is a first anywhere.
Video Games
When it comes to the names of Boo’s forms, you can divide Japanese DBZ games into two categories. The older games that featured Boo, from Super Butoden 3 to Final Bout, had their own unique naming scheme, while those from the DBZ (Budokai) series up to the present almost all follow the Daizenshuu 4/7 naming scheme. In either case though, no distinction is ever made between Innocent Boo and Good Boo; they’re always lumped together like in Daizenshuu 7. Since Innocent/Good Boo was the first form to appear in the series, the older games simply labeled him as “Majin Boo”. This is seen in Super Butoden 3, Hyper Dimension, Ultimate Battle 22, Legends, Shin Butoden, and Legendary Super Warriors. Meanwhile, he’s called “Majin Boo (good)” in the Japanese versions of the DBZ (Budokai) series, the Sparking! (Budokai Tenkaichi) series, the Raging Blast series, Bukuu Ressen (Super Sonic Warriors 2), Shin Budokai 2, and Dragon Battlers. Super DBZ is the only modern game to just call him “Majin Boo”, though this is probably because he’s the only form of Boo featured in that game. In the English versions of the recent games he is, I think, generally just called “Majin Buu”.
Fandom
English-speaking fans have commonly referred to Innocent and Good Boo as “Fat Boo” since basically forever, which as we’ve seen is a name that has roots in the manga. Curtis Hoffman used the phrase “Fat Buu” in his influential early manga summaries, which probably helped give the term a boost. He also used “Stupid Buu”, which never really took off for some reason. The DB wikai lists “Rolie Buu” as one of this form’s alternate name, though I have no clue who calls him that. Daizenshuu EX’s Transformation Guide somewhat misleadingly treats “Good Boo” as a name which the daizenshuu uses to refer exclusively to Boo prior to the split between his good and evil halves, when as we’ve seen it’s either used for the fat Boo specifically after the good/evil split, or to refer to the fat Boo both before and after the split.
Pure Evil Majin Boo
This skinny version of Boo which Innocent Boo expels out of his body has a lot of the same naming problems seen with Innocent and Good Boo. He’s not always clearly separated from Evil or Pure Boo, and names which people use for him tend to get used to refer to the other two just as often. And yes, the daizenshuu naming scheme for these three forms can be pretty confusing before you get used to it (“Pure Evil”, “Evil”, and “Pure”). But it makes a lot of sense if you think about it. Or maybe it makes sense if you avoid thinking about it. Either way.
Manga
After the Boo/Boo split in chapter 485, the narrator refers to Pure Evil Boo as, well, “a pure evil Majin Boo” (純粋悪の魔人ブウ/junsui-aku no Majin Buu), which is where the daizenshuu get their name for him from. The narrator also simply refers to him as “the evil one” (悪の方/aku no hou) to distinguish him from Good Boo. In chapter 507, Vegeta refers to this form as “the scrawny Majin Boo” (ガリガリの魔人ブウ/gari-gari no Majin Buu). In Viz’s translation of the manga, the descriptions of Pure Evil Boo as being pure evil were changed to him instead being called “pure/concentrated wrath”. Viz may possibly have done this in order to create some clearer distinction between Pure Evil Boo and Pure Boo, since in the original manga they are described in similar, though not exactly identical, terms (Pure Boo gets called “evil itself” rather than “pure evil”).
Guidebooks
Daizenshuu 2 lumps him in together with Evil Boo and Pure Boo, referring to all three as simply “Majin Boo (evil)”. Daizenshuu 4 uses the label “Majin Boo (pure evil)” to separate him from the other evil forms, and this carried over into Daizenshuu 7, DB Forever, and the Super Exciting Guides.
Video Games
Since in the series he serves as little more than a briefly seen intermediate form, Pure Evil Boo has been featured in precious few video games. His first and so far only appearances as a playable character have been in the Sparking! (Budokai Tenkaichi) series, where he is called “Majin Boo (pure evil)” like in the guidebooks. This naming scheme is also retained in the English version of the games. Pure Evil Boo is seen briefly in Buu’s Fury, and the scouter entry for “Super Buu” refers to him as “Evil Buu”.
Fandom
Fans often refer to this form as “Skinny Boo”, “Thin Boo”, or “Grey Boo” (based on his color in the anime). He is also sometimes called “Wrath Boo” due to the way he is described in the Viz manga. People also sometimes call him “Aku Boo”, confusing him with Evil Boo. Curtis Hoffman referred to him both as “Thin Buu” and “Evil Buu” in his manga summaries.
Evil Majin Boo
The muscular form which Pure Evil Boo transforms into after eating Good Boo. Here I’ll just talk about his basic form, and leave his absorptions for the next section.
Manga
The title for chapter 486 is “The Terrifying New Majin Boo” (恐怖の新魔人ブウ/Kyoufu no Shin Majin Buu). In this chapter Piccolo refers to Boo as having become “pure evil”, which is how the narrator also referred to Pure Evil Boo of course. In Viz Piccolo instead refers to this Boo as "pure rage".
Guidebooks
As mentioned already, Daizenshuu 2 refers to Pure Evil Boo, Evil Boo, and Pure Boo as just “Majin Boo (evil)”, while Daizenshuu 4 and 7 use the “evil” label to refer specifically to this form of Boo, a tradition which continued into DB Forever and the SEGs. Daizenshuu 6's section on DBZ movie 12 says that the movies' events, while contradicting the series in many ways, would occur roughly before the battle with "Super Boo" reached its climax. Exactly which form "Super Boo" refers to isn't specified, but Daizenshuu 6 came out after the release of the games Ultimate Battle 22 and Shin Butouden, which used the term to refer to Evil Boo (as detailed below). So probably they meant Evil Boo too, but since they refer to the "climax" of the battle, perhaps they are using the term to refer to Pure Boo or as a catch-all phrase indicating all forms of Boo besides Innocent/Good Boo, similar to how Daizenshuu 2 uses "Majin Boo (evil)". At any rate, I'm pretty sure this is the only point where any guidebooks use the term "Super Boo".
Video Games
Evil Boo first appeared as a playable character in Ultimate Battle 22, where he was called "Super Boo" (超ブウ/Suupaa Buu). This name was also used in Shin Butoden and Legends. It is likely from these games that the name "Super Boo" became so strongly associated with the character in English-speaking fandom. So strongly in fact that Funimation made "Super Buu" their official name for this form. The Japanese versions of the recent games, however, have all stuck with the daizenshuu name "Majin Boo (evil)", which is used in Legendary Super Warriors, the DBZ (Budokai) series, the Sparking! (Budokai Tenkaichi) series, the Raging Blast series, and Bukuu Ressen (Super Sonic Warriors 2). But since Funimation uses "Super Buu", the English version of most of these games have used that name instead of "Majin Buu (evil)". The "evil" label is only retained in the English version of Legendary Super Warriors as well as Bukuu Ressen (Super Sonic Warriors 2). The American-made game Buu’s Fury uses the “Super Buu” name.
Fandom
“Super Boo” has probably been the main name by which this form has been known in English-speaking fandom. It is sometimes written as “Chou Boo”, the Japanese equivalent, which is in turn sometimes garbled as “Chao Boo”. Curtis Hoffman referred to him both as “New Buu” (taken from the title of chapter 486) and “Stage Two Buu”. He also started calling him “Ultimate Buu” towards the end of his manga summaries, though it seems that he originally intended this name to only refer to Buu’s form after absorbing Gotenks and the others (more on this below). In more recent years people have started calling him “Shin Boo”, which is essentially the un-translated version of Hoffman’s “New Buu”. Apparently some people call him “Adult Boo” (or so I gather from the DB wikia).
Evil Buu’s Absorptions
Now, technically Innocent Boo and Evil Boo are themselves forms brought about through absorptions, but here I’ll just go over the forms Boo reaches after absorbing Gotenks, Piccolo, and Gohan. His South Kaioshin form will be dealt with after this.
Manga
Boo’s various absorbed forms aren’t really called anything specific in the manga. After absorbing Gotenks and Piccolo in chapter 499, Boo refers to his new self as the “mightiest majin” (最強の魔人/saikyou no majin), but that’s about it. Interestingly Curtis Hoffman’s manga summaries (which were written while the Boo arc was still serializing in Jump) say that when chapter 501 ran in Jump, a sidebar asked whether “Buu + Piccolo + Super Gotenks == Super Bupinks". Unfortunately I’ve been unable to find any other mention of this, but some Japanese fans do refer to that form as “Super Bupinks” (超ブピンクス).
Guidebooks
The guidebooks specify Boo’s absorption-based forms with “Majin Boo (Gotenks-absorbed)” or “Majin Boo (Gohan-absorbed)”, or similar variations. Poor Piccolo always seems to be ignored.
Video Games
Boo’s absorbed forms didn’t really appear in the older video games, but the more recent ones have generally used the same naming scheme as above. Oddly, in Sparking! Neo the fusion potara for unlocking Boo’s Gotenks and Gohan forms are named “Super Boo” and “Super Boo 2”, respectively. However, on the character select screen itself they are identified as “Gotenks-absorbed” and “Gohan-absorbed” like always.
Fandom
As mentioned above, some Japanese fans call Boo’s Gotenks-absorbed form “Super Bupinks”, which may have appeared in Jump at one point. Some Japanese fans also use “Goha-Boo” to refer to Boo’s Gohan-absorbed form. Similarly, English-speaking fans have for a long time referred to these forms as “Bootenks” and “Boohan”. As a take-off of Evil Boo being called “Super Boo”, sometimes his Gotenks/Gohan forms are called “Super Boo 2” and “Super Boo 3” (which leads to odd sub-categories like Piccolo-absorbed Boo being “Super Boo 1.5”). Curtis Hoffman described Gotenks-absorbed Boo as the “Ultimate Majin” in his manga summaries, which is probably intended as a translation of the phrase “mightiest majin”, which does appear in the manga. In the introduction to his summary of volume 41, he describes ‘Ultimate Buu” as being the form Buu reaches after absorbing Gotenks, Piccolo, and finally Gohan. However, in his summary of volume 42 he starts describing regular Evil Boo as “Ultimate Buu” as well. This may be simply because he got used to using that name, or perhaps because he didn’t realize that Evil Boo had regressed to his initial state. When Boo regressed from Gohan-absorbed down to Piccolo-absorbed and then finally back to regular Evil Boo, Hoffman simply describes this as Boo “going into spasms”. Either way, “Ultimate Boo” doesn’t seem to be in much use in the fandom these days.
South Kaioshin-absorbed
Boo originally transforms into this incredibly muscular form after absorbing the South Kaioshin as Pure Boo. He then briefly (and somewhat inexplicably) returns to this form as part of his regression from Evil Boo back into Pure Boo.
Manga
In chapter 508, the Elder Kaioshin describes this form as the “huge Majin Boo” (でかい魔人ブウ/dekai Majin Buu).
Guidebooks
This form gets pretty much ignored in all of the guidebooks so far. That is, they’ll mention how Boo absorbs the South Kaioshin and all, but they never refer to this form with a specific name, not even “Majin Boo (South Kaioshin-absorbed)”, like they do with his other absorbed forms.
Video Games
And this form has yet to appear in any video game. Hmmm…maybe Raging Blast 2 will be his lucky day.
Fandom
Fans seem to most often call this form “Buff Boo”, though “Mega Boo” and "Ultra Boo" also used sometimes. He is also occasionally called “Chou (Super) Boo”, a name more often used for Evil Boo.
Pure Majin Boo
Boo finally reverts back into this small, childlike form after Goku and Vegeta pull out everyone he had previously absorbed from his body.
Manga
The title of chapter 508 is “The Pure Majin Boo” (純粋の魔人ブウ/Junsui no Majin Buu), which is where the daizenshuu gets its name for this form. Also in this chapter, the Elder Kaioshin describes this form as “the small Majin Boo” (ちいさな魔人ブウ/chiisa na Majin Buu). Vegeta refers to him as the “outrageous Boo” (とんでもない魔人ブウ/tondemonai Buu) in chapter 517, and Goku calls him the “outrageously bad Majin Boo” (とんでも ねえ悪の方の魔人ブウ/tondemonee waru no hou no Majin Buu) in chapter 518.
Guidebooks
You could probably recite this yourself by now, but Daizenshuu 2 lumps Pure Boo in with Pure Evil Boo and Evil Boo, calling them all just “Majin Boo (evil)”, while Daizenshuu 4 and 7 call this form “Majin Boo (pure)” based on the title of chapter 508. This name scheme continues on into DB Forever and the SEGs.
Video Games
Interestingly, the older games Hyper Dimension, Legends, and Final Bout distinguished Pure Boo from the other forms by calling him simply “Boo”, in contrast to “Majin Boo” for Good Boo or “Super Boo” for Evil Boo. In Legendary Super Warriors he is named “Pure Evil”, though the game otherwise uses the daizenshuu names for things. The Japanese versions of the DBZ (Budokai) series, the Sparking! (Budokai Tenkaichi) series, and the Raging Blast series all call him “Majin Boo (pure)”, but the English versions of those games use Funimation’s name for him, “Kid Buu”.
Fandom
Fans who really ought to know better have a habit of referring to Pure Boo as “Chibi Boo”, though this name is used nowhere in the actual series or in other Japanese products. “Chibi” is Japanese slang for “small” or “short”, and it’s been used to describe the kid forms of Goku, Trunks, and other characters in the daizenshuu and other Japanese stuff, so English-speaking fans probably just started applying the “chibi” label to this form of Boo by extension. I suppose this shouldn’t annoy me as much as it does, but thanks to people like Mike saying “Chibi Boo” all the time, lots of people now think it’s the character’s actual Japanese name, which it isn’t. Anyway, since “chibi Goku” or “chibi Trunks” is a name applied to those characters as kids, once people started calling this form of Boo “Chibi Boo” it was probably only a matter of time before they started calling him “Kid Boo” as well. “Kid Buu” was such a widespread name in the English-speaking fandom that Funimation adopted it as their official name for the character. But make no mistake, the name predates the Funi dub. I distinctly remember how back when I was a newbie, the older DB fans speculated about how “Kid Buu” would sound in the dub when Funi got to that point. In his manga summaries, Curtis Hoffman referred to this form as “the REAL Buu” (his translation of chapter 508’s title), “the True Buu”, as well as simply “Little Buu”.
Innocent/Good Majin Boo
This fat form of Boo is the first version of the character that appears in the series. But the annoying thing about this form is that it’s technically two forms in one. There’s the initial Boo who comes out of the ball and fights with Majin Vegeta and SSj3 Goku (labeled “Innocent Majin Boo” by the daizenshuu, but more on that later). But once this Boo expels his evil half, he becomes “Good Boo”, who later changes his name to “Mister Boo” in the manga. Innocent Boo and Good Boo look exactly the same, but Good Boo has an actual sense of right and wrong (taught to him by, appropriately enough, Satan), and doesn’t have nearly as much power as Innocent Boo, since the evil half took the majority of the power when the two split. However, guides, video games, and fans have rather understandably tended to lump Innocent Boo and Good Boo together. So any name that’s applied to one will likely end up getting applied to the other somewhere or other.
Manga
Being the first form of Boo to appear, Innocent Boo is referred to as simply “Majin Boo” most of the time he’s around. In chapter 485 of the manga, after Innocent Boo ejects Pure Evil Boo from his body, the narrator refers to him as both “the original Majin Boo” (元祖魔人ブウ/ganso Majin Buu) and “the innocent Majin Boo” (無邪気な魔人ブウ/mujaki na Majin Buu). The later obviously seems to be where the daizenshuu got the name “Innocent Boo” from, though the narrator uses it to describe the form of Boo which the daizenshuu would technically label “Good Boo”, since it’s after he expelled his evil side. When Goku and Vegeta discover Good Boo inside of Evil Boo’s body in chapter 506, Goku refers to him as “Majin Boo! The very first one of all!” (魔人ブウ! いちばん最初のやつ/Majin Buu! Ichiban saisho no yatsu). In chapters 507, 514, and 515, Vegeta distinguishes Good Boo from the other forms of Boo by calling him “the fatso” (デブの方/debu no hou or simply デブ/debu). Meanwhile, Goku refers to Good Boo as “the fat Majin Boo” (太っちょの魔人ブウ/futoccho no Majin Buu) in chapter 508, and Dende uses the same name in chapter 509. The title page for chapter 518 explains that ten years after the battle with Evil Boo, Good Boo now goes by “Mister Boo” rather than “Majin Boo”. Note that this is the English word “Mister” (ミスターブウ/Misutaa Buu), just like with Mister Satan, though Boo does get called “Boo-san” (the Japanese equivalent of “Mister Boo) a few times during the final two chapters.
Guidebooks
The naming scheme for Boo’s forms used in most guidebooks and all recent Japanese video games wasn’t actually developed until Daizenshuu 4. In Daizenshuu 2’s All Battles list, for instance, Innocent Boo is simply called “Majin Boo”, Good Boo is labeled “Majin Boo (good)”, while Pure Evil Boo, Evil Boo, and Pure Boo are all lumped together as “Majin Boo (evil)”. The Daizenshuu 4 chart of Boo’s transformation is the first place we see the label 魔人ブウ (無邪気)/Majin Buu (mujaki), “Majin Boo (innocent)” and 魔人ブウ (善)/Majin Buu (zen) “Majin Boo (good)”. It should be noted that Good Boo is never actually described as “good” in the manga. The entry for Bee in the “Animals and Monsters” section also uses the term “Majin Boo (innocent)”, but apart from that the Innocent/Good distinction hasn’t been all used that much. In Daizenshuu 7 Innocent Boo is lumped in with Good Boo in the technique dictionary and elsewhere, though otherwise the book uses the same naming scheme for Boo’s forms as Daizenshuu 4. The Super Exciting Guide: Character Volume uses Daizenshuu 4’s distinction between Innocent and Good Boo in its own chart of Boo’s transformations, and the SEG: Character Volume uses the term “Innocent Majin Boo” as well. The SEG: Character Volume's page for Majin Boo also refers to Innocent Boo as "Dai Kaioshin-absorbed", the same naming scheme used for Boo's Gotenks and Gohan forms, which I think is a first anywhere.
Video Games
When it comes to the names of Boo’s forms, you can divide Japanese DBZ games into two categories. The older games that featured Boo, from Super Butoden 3 to Final Bout, had their own unique naming scheme, while those from the DBZ (Budokai) series up to the present almost all follow the Daizenshuu 4/7 naming scheme. In either case though, no distinction is ever made between Innocent Boo and Good Boo; they’re always lumped together like in Daizenshuu 7. Since Innocent/Good Boo was the first form to appear in the series, the older games simply labeled him as “Majin Boo”. This is seen in Super Butoden 3, Hyper Dimension, Ultimate Battle 22, Legends, Shin Butoden, and Legendary Super Warriors. Meanwhile, he’s called “Majin Boo (good)” in the Japanese versions of the DBZ (Budokai) series, the Sparking! (Budokai Tenkaichi) series, the Raging Blast series, Bukuu Ressen (Super Sonic Warriors 2), Shin Budokai 2, and Dragon Battlers. Super DBZ is the only modern game to just call him “Majin Boo”, though this is probably because he’s the only form of Boo featured in that game. In the English versions of the recent games he is, I think, generally just called “Majin Buu”.
Fandom
English-speaking fans have commonly referred to Innocent and Good Boo as “Fat Boo” since basically forever, which as we’ve seen is a name that has roots in the manga. Curtis Hoffman used the phrase “Fat Buu” in his influential early manga summaries, which probably helped give the term a boost. He also used “Stupid Buu”, which never really took off for some reason. The DB wikai lists “Rolie Buu” as one of this form’s alternate name, though I have no clue who calls him that. Daizenshuu EX’s Transformation Guide somewhat misleadingly treats “Good Boo” as a name which the daizenshuu uses to refer exclusively to Boo prior to the split between his good and evil halves, when as we’ve seen it’s either used for the fat Boo specifically after the good/evil split, or to refer to the fat Boo both before and after the split.
Pure Evil Majin Boo
This skinny version of Boo which Innocent Boo expels out of his body has a lot of the same naming problems seen with Innocent and Good Boo. He’s not always clearly separated from Evil or Pure Boo, and names which people use for him tend to get used to refer to the other two just as often. And yes, the daizenshuu naming scheme for these three forms can be pretty confusing before you get used to it (“Pure Evil”, “Evil”, and “Pure”). But it makes a lot of sense if you think about it. Or maybe it makes sense if you avoid thinking about it. Either way.
Manga
After the Boo/Boo split in chapter 485, the narrator refers to Pure Evil Boo as, well, “a pure evil Majin Boo” (純粋悪の魔人ブウ/junsui-aku no Majin Buu), which is where the daizenshuu get their name for him from. The narrator also simply refers to him as “the evil one” (悪の方/aku no hou) to distinguish him from Good Boo. In chapter 507, Vegeta refers to this form as “the scrawny Majin Boo” (ガリガリの魔人ブウ/gari-gari no Majin Buu). In Viz’s translation of the manga, the descriptions of Pure Evil Boo as being pure evil were changed to him instead being called “pure/concentrated wrath”. Viz may possibly have done this in order to create some clearer distinction between Pure Evil Boo and Pure Boo, since in the original manga they are described in similar, though not exactly identical, terms (Pure Boo gets called “evil itself” rather than “pure evil”).
Guidebooks
Daizenshuu 2 lumps him in together with Evil Boo and Pure Boo, referring to all three as simply “Majin Boo (evil)”. Daizenshuu 4 uses the label “Majin Boo (pure evil)” to separate him from the other evil forms, and this carried over into Daizenshuu 7, DB Forever, and the Super Exciting Guides.
Video Games
Since in the series he serves as little more than a briefly seen intermediate form, Pure Evil Boo has been featured in precious few video games. His first and so far only appearances as a playable character have been in the Sparking! (Budokai Tenkaichi) series, where he is called “Majin Boo (pure evil)” like in the guidebooks. This naming scheme is also retained in the English version of the games. Pure Evil Boo is seen briefly in Buu’s Fury, and the scouter entry for “Super Buu” refers to him as “Evil Buu”.
Fandom
Fans often refer to this form as “Skinny Boo”, “Thin Boo”, or “Grey Boo” (based on his color in the anime). He is also sometimes called “Wrath Boo” due to the way he is described in the Viz manga. People also sometimes call him “Aku Boo”, confusing him with Evil Boo. Curtis Hoffman referred to him both as “Thin Buu” and “Evil Buu” in his manga summaries.
Evil Majin Boo
The muscular form which Pure Evil Boo transforms into after eating Good Boo. Here I’ll just talk about his basic form, and leave his absorptions for the next section.
Manga
The title for chapter 486 is “The Terrifying New Majin Boo” (恐怖の新魔人ブウ/Kyoufu no Shin Majin Buu). In this chapter Piccolo refers to Boo as having become “pure evil”, which is how the narrator also referred to Pure Evil Boo of course. In Viz Piccolo instead refers to this Boo as "pure rage".
Guidebooks
As mentioned already, Daizenshuu 2 refers to Pure Evil Boo, Evil Boo, and Pure Boo as just “Majin Boo (evil)”, while Daizenshuu 4 and 7 use the “evil” label to refer specifically to this form of Boo, a tradition which continued into DB Forever and the SEGs. Daizenshuu 6's section on DBZ movie 12 says that the movies' events, while contradicting the series in many ways, would occur roughly before the battle with "Super Boo" reached its climax. Exactly which form "Super Boo" refers to isn't specified, but Daizenshuu 6 came out after the release of the games Ultimate Battle 22 and Shin Butouden, which used the term to refer to Evil Boo (as detailed below). So probably they meant Evil Boo too, but since they refer to the "climax" of the battle, perhaps they are using the term to refer to Pure Boo or as a catch-all phrase indicating all forms of Boo besides Innocent/Good Boo, similar to how Daizenshuu 2 uses "Majin Boo (evil)". At any rate, I'm pretty sure this is the only point where any guidebooks use the term "Super Boo".
Video Games
Evil Boo first appeared as a playable character in Ultimate Battle 22, where he was called "Super Boo" (超ブウ/Suupaa Buu). This name was also used in Shin Butoden and Legends. It is likely from these games that the name "Super Boo" became so strongly associated with the character in English-speaking fandom. So strongly in fact that Funimation made "Super Buu" their official name for this form. The Japanese versions of the recent games, however, have all stuck with the daizenshuu name "Majin Boo (evil)", which is used in Legendary Super Warriors, the DBZ (Budokai) series, the Sparking! (Budokai Tenkaichi) series, the Raging Blast series, and Bukuu Ressen (Super Sonic Warriors 2). But since Funimation uses "Super Buu", the English version of most of these games have used that name instead of "Majin Buu (evil)". The "evil" label is only retained in the English version of Legendary Super Warriors as well as Bukuu Ressen (Super Sonic Warriors 2). The American-made game Buu’s Fury uses the “Super Buu” name.
Fandom
“Super Boo” has probably been the main name by which this form has been known in English-speaking fandom. It is sometimes written as “Chou Boo”, the Japanese equivalent, which is in turn sometimes garbled as “Chao Boo”. Curtis Hoffman referred to him both as “New Buu” (taken from the title of chapter 486) and “Stage Two Buu”. He also started calling him “Ultimate Buu” towards the end of his manga summaries, though it seems that he originally intended this name to only refer to Buu’s form after absorbing Gotenks and the others (more on this below). In more recent years people have started calling him “Shin Boo”, which is essentially the un-translated version of Hoffman’s “New Buu”. Apparently some people call him “Adult Boo” (or so I gather from the DB wikia).
Evil Buu’s Absorptions
Now, technically Innocent Boo and Evil Boo are themselves forms brought about through absorptions, but here I’ll just go over the forms Boo reaches after absorbing Gotenks, Piccolo, and Gohan. His South Kaioshin form will be dealt with after this.
Manga
Boo’s various absorbed forms aren’t really called anything specific in the manga. After absorbing Gotenks and Piccolo in chapter 499, Boo refers to his new self as the “mightiest majin” (最強の魔人/saikyou no majin), but that’s about it. Interestingly Curtis Hoffman’s manga summaries (which were written while the Boo arc was still serializing in Jump) say that when chapter 501 ran in Jump, a sidebar asked whether “Buu + Piccolo + Super Gotenks == Super Bupinks". Unfortunately I’ve been unable to find any other mention of this, but some Japanese fans do refer to that form as “Super Bupinks” (超ブピンクス).
Guidebooks
The guidebooks specify Boo’s absorption-based forms with “Majin Boo (Gotenks-absorbed)” or “Majin Boo (Gohan-absorbed)”, or similar variations. Poor Piccolo always seems to be ignored.
Video Games
Boo’s absorbed forms didn’t really appear in the older video games, but the more recent ones have generally used the same naming scheme as above. Oddly, in Sparking! Neo the fusion potara for unlocking Boo’s Gotenks and Gohan forms are named “Super Boo” and “Super Boo 2”, respectively. However, on the character select screen itself they are identified as “Gotenks-absorbed” and “Gohan-absorbed” like always.
Fandom
As mentioned above, some Japanese fans call Boo’s Gotenks-absorbed form “Super Bupinks”, which may have appeared in Jump at one point. Some Japanese fans also use “Goha-Boo” to refer to Boo’s Gohan-absorbed form. Similarly, English-speaking fans have for a long time referred to these forms as “Bootenks” and “Boohan”. As a take-off of Evil Boo being called “Super Boo”, sometimes his Gotenks/Gohan forms are called “Super Boo 2” and “Super Boo 3” (which leads to odd sub-categories like Piccolo-absorbed Boo being “Super Boo 1.5”). Curtis Hoffman described Gotenks-absorbed Boo as the “Ultimate Majin” in his manga summaries, which is probably intended as a translation of the phrase “mightiest majin”, which does appear in the manga. In the introduction to his summary of volume 41, he describes ‘Ultimate Buu” as being the form Buu reaches after absorbing Gotenks, Piccolo, and finally Gohan. However, in his summary of volume 42 he starts describing regular Evil Boo as “Ultimate Buu” as well. This may be simply because he got used to using that name, or perhaps because he didn’t realize that Evil Boo had regressed to his initial state. When Boo regressed from Gohan-absorbed down to Piccolo-absorbed and then finally back to regular Evil Boo, Hoffman simply describes this as Boo “going into spasms”. Either way, “Ultimate Boo” doesn’t seem to be in much use in the fandom these days.
South Kaioshin-absorbed
Boo originally transforms into this incredibly muscular form after absorbing the South Kaioshin as Pure Boo. He then briefly (and somewhat inexplicably) returns to this form as part of his regression from Evil Boo back into Pure Boo.
Manga
In chapter 508, the Elder Kaioshin describes this form as the “huge Majin Boo” (でかい魔人ブウ/dekai Majin Buu).
Guidebooks
This form gets pretty much ignored in all of the guidebooks so far. That is, they’ll mention how Boo absorbs the South Kaioshin and all, but they never refer to this form with a specific name, not even “Majin Boo (South Kaioshin-absorbed)”, like they do with his other absorbed forms.
Video Games
And this form has yet to appear in any video game. Hmmm…maybe Raging Blast 2 will be his lucky day.
Fandom
Fans seem to most often call this form “Buff Boo”, though “Mega Boo” and "Ultra Boo" also used sometimes. He is also occasionally called “Chou (Super) Boo”, a name more often used for Evil Boo.
Pure Majin Boo
Boo finally reverts back into this small, childlike form after Goku and Vegeta pull out everyone he had previously absorbed from his body.
Manga
The title of chapter 508 is “The Pure Majin Boo” (純粋の魔人ブウ/Junsui no Majin Buu), which is where the daizenshuu gets its name for this form. Also in this chapter, the Elder Kaioshin describes this form as “the small Majin Boo” (ちいさな魔人ブウ/chiisa na Majin Buu). Vegeta refers to him as the “outrageous Boo” (とんでもない魔人ブウ/tondemonai Buu) in chapter 517, and Goku calls him the “outrageously bad Majin Boo” (とんでも ねえ悪の方の魔人ブウ/tondemonee waru no hou no Majin Buu) in chapter 518.
Guidebooks
You could probably recite this yourself by now, but Daizenshuu 2 lumps Pure Boo in with Pure Evil Boo and Evil Boo, calling them all just “Majin Boo (evil)”, while Daizenshuu 4 and 7 call this form “Majin Boo (pure)” based on the title of chapter 508. This name scheme continues on into DB Forever and the SEGs.
Video Games
Interestingly, the older games Hyper Dimension, Legends, and Final Bout distinguished Pure Boo from the other forms by calling him simply “Boo”, in contrast to “Majin Boo” for Good Boo or “Super Boo” for Evil Boo. In Legendary Super Warriors he is named “Pure Evil”, though the game otherwise uses the daizenshuu names for things. The Japanese versions of the DBZ (Budokai) series, the Sparking! (Budokai Tenkaichi) series, and the Raging Blast series all call him “Majin Boo (pure)”, but the English versions of those games use Funimation’s name for him, “Kid Buu”.
Fandom
Fans who really ought to know better have a habit of referring to Pure Boo as “Chibi Boo”, though this name is used nowhere in the actual series or in other Japanese products. “Chibi” is Japanese slang for “small” or “short”, and it’s been used to describe the kid forms of Goku, Trunks, and other characters in the daizenshuu and other Japanese stuff, so English-speaking fans probably just started applying the “chibi” label to this form of Boo by extension. I suppose this shouldn’t annoy me as much as it does, but thanks to people like Mike saying “Chibi Boo” all the time, lots of people now think it’s the character’s actual Japanese name, which it isn’t. Anyway, since “chibi Goku” or “chibi Trunks” is a name applied to those characters as kids, once people started calling this form of Boo “Chibi Boo” it was probably only a matter of time before they started calling him “Kid Boo” as well. “Kid Buu” was such a widespread name in the English-speaking fandom that Funimation adopted it as their official name for the character. But make no mistake, the name predates the Funi dub. I distinctly remember how back when I was a newbie, the older DB fans speculated about how “Kid Buu” would sound in the dub when Funi got to that point. In his manga summaries, Curtis Hoffman referred to this form as “the REAL Buu” (his translation of chapter 508’s title), “the True Buu”, as well as simply “Little Buu”.