Goku's Spirit Bomb is treated as his ultimate move, but in the main timeline, it's seen more failures than successes.

Goku and Vegeta's flaws are what make them who they are, but they're also putting the entire Demon Realm in danger.

skinny and intelligent Buu capable of complex speech and rationality, even before absorbing Piccolo, Goten and Trunks (as Gotenks), Gohan and countless others before Goku and Vegeta intervened.