This is Mr. Buu AND the first Majin Buu. The first Majin Buu is stronger than Mr. Buu, and Mr. Buu is a nice guy who will only protect his friends.
This is Pure Evil Buu, who Mr. Buu spit out to become a good guy. This one is stronger than Mr. Buu, but weaker than the first Majin Buu.
This is Super Buu, who is Pure Evil Buu after consuming Mr. Buu. He is stronger than all of the previous three.
This is Buutenks, Super Buu who has absorbed Piccolo and SSJ3 Gotenks. He is MUCH more powerful than the previous Buus.
This Buuhan, Super Buu with Piccolo, Kid Trunks, Goten and Ultimate Gohan absorbed. He is the most powerful villain in the history of DBZ, bar none.
This is Kid Buu. He is Buu's basic form. He is stronger than Mr. Buu, Pure Evil Buu, and (maybe) the first Majin Buu, but weaker than the rest.
Now, remember everybody, even if it is Buuhan we're using, Gohan, Trunks, Goten and Piccolo were all incapacitated after being released from Buu, and assuming this fight goes relatively quickly, they're not going to be any help.
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