Magenta (sp?) is the leader of the RRA here, he's the son of Commander Red. Also, I'm not sure how Android 21 is presented exactly, but I think she's named in her human form as Gero's wife or something as an Easter Egg.
A lot of this is typical DBS bollocks, but frankly I'm not minding most of what I'm reading. Sure, there's goofy power ups and a revival of Cell, but I'd rather use all this cheese on new and younger characters and let Goku and Vegeta take a backseat. The series is in desperate need of fresh air. DBS has run the Goku/Vegeta Lethal Weapon style relationship with Mel Gibson and Danny Glover into the ground. Power up the kids, give Piccolo something to do again, and bring Cell back just enough to help Gohan ascend. I'm willing to give all of it a shot.
Also, from what I understand, this isn't THE Cell. He's A Cell. He's got the same body but I don't think he's got the memories of Cell Saga Cell.
We'll see. I'm interested to see how the return of Cell weighs in compared to Freeza. Whether the quick one and done fight is easier to swallow that Freeza being allowed to return as basically a B-tier member of the cast.