Most underused attack?

[Southern Gothic]

Which attacks or techniques do you like that shoukd have been used more?

The Big Bang attack comes to mind. It was really only effective against #19. Though I suppose it is just an amped energy ball l0l. He used it against Cooler too, I think, but nothing happened.

And the Kaioken. I would have liked to have really seen it used after Namek, especially by the humans.

USSJ. Even if it sucks, Trunks looked like such a beast.

 

[Fantastische Hure]

Super-Ghost Kamikaze Attack, even-though it might be for the best that it's not coming back, l0l.

Also the "atomic-blast" or something like that, which Majin Vegeta did. The one time he did use it, it looked really kewl.

 

[Zippy]

Pretty much all of Vegeta's techniques which he only uses like 1nce each.
Piccolo's hell zone and light grenade complete wastes, both of em.

 

[SSJ2]

Big Bang. It seemed as though it was a decently amped attack that didn't require a lot of charge time, I'm not sure why Vegeta never used it again.

 

[Papasmurf]

Basically every attack Vegeta used (he literally used that two-handed blast from the Freeza saga that was unnamed in the manga more than any "signature attack"). Piccolo's attacks as well since he basically forgot how to stretch his limbs outside filler and never used Makankosappo after the Saiyan arc (I guess you could just say he didn't get any chances to fight after the Cell arc to justify those other techniques disappearing though).

Kaioken was conveniently forgotten, although I can understand how that happened seeing as it's one of the main culprits of the massive inflation at the end of the Freeza arc alongside overused zenkais.

The Super KHH also comes to mind, seeing as Goku didn't even attempt it against Raditz who was multi-fold Piccolo.