Who would emerge victorious? All of Toei/Shonen canon for DB.
[spoiler]I know I posted this before
I don't know where it went.[/spoiler]
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So if evil buu killed fat buu with candy beam this means that there are many ways Warhammer 40k can deflect candy beam back at buu and killing him. Not even buu can survive his own candy beam. So the C'tan can just send that beam right back at buu that takes care if your biggest killer in DBZ. Now void dragon go wreck what's left of them.