Board Thread:General Discussion/@comment-29275465-20160826234143/@comment-2175012-20160925164751

Part of the reason as to why Evil Buu doesn't qualify is because he's literally the physical manifestation of Buu's darkside, akin to King Piccolo being Kami's evil taken form. Ergo, their moral agency is questionable.

But, yeah, Evil Buu doesn't do enough on screen.