Good Buu is the form that fans know and love, while Evil Buu is a terrifying and destructive opponent. Ultimate Buu, formed by absorbing Ultimate Gohan, is the strongest version of Buu ...

Majin Buu is one of the strongest villains in all of Dragon Ball. An ancient, malevolent force of evil that ravaged Universe ...

Thus, Super Buu would be a solid alternative for representing Buu. Variants could include the gray Pure Evil Buu, as well as Super Buu after absorbing Gotenks, and another after absorbing Gohan.