I've been thinking about this for a while. We have one page for Buu, but it is pretty clear that there are different forms of Buu with different personalities.
We had Majin Buu (the fat one) who separated from Evil Buu. They battled and Evil Buu triumphed, absorbing Buu to become Super Buu. All the beings absorbed by Super Buu were later released to unleash the original Buu - Kid Buu (who also battled Fat Buu, that would later become Mr. Buu later after Kid Buu's defeat).
I think this should be treated as we treat the fusions - with separate pages. There should be Majin Buu (Mr. Buu), Evil Buu, Super Buu and Kid Buu pages in my opinion.