Dragon Ball: I Become Buu's Void Devourer

Reborn as Buu, with a devouring System to boot. Buu plus a System? That’s just perfect.

Who knew I’d be controlled by Bibidi from the start, with no freedom at all?

Bibidi: “Damn you, Buu! I’ll seal you away!”

Buu: “You think you can take me? Die! System, devour him!”

[Ding! The target is too weak to devour.]

“System, you’re messing with me!”

With a System that works only now and then, Buu has no choice but to do things himself. Attack head-on? No good! The other guy’s sealing magic is instantaneous. Sneak up from behind? No good! If the other guy dies, the sealing magic activates automatically.

What? Bibidi’s sealing magic can only be used once.

Buu grins. Looks like I’ll have to hand over Buu.

Bibidi: “What? I sealed Fat Buu?”

Grand Supreme Kai (devoured), South Supreme Kai (devoured), North Supreme Kai (devoured).

West Supreme Kai (devour, )... Wait! I can keep this one around.

“What? You want me to become a God of Destruction?”

“No way, no way. You ask why?”

“Hahaha! I am the Demon, the Man, the Buu!”

Ten thousand years later.

“Little Grand Priest, why aren’t you on your knees before this Demon Emperor!”

(Fan fiction. If you know, you know. Any similarities are purely coincidental.)