Majin Buu Stages

Fat Buu

This is Majin buu after he was released from his shell.
This is the first form we see him be in, but not actually his first form. When he manages to absorb the Grand Supreme Kai in Otherworld, he takes on not just a similar appearance, but a love for sweets, and more pure of heart. Later when Evil Buu is separated from him, Fat Buu becomes pure good and actually joins up with the good guys.

Evil Buu

This is the pure evil side of Fat Buu separated out of his body. He is much stronger than Buu, and actually manages to absorb his good half, and become the all powerful Super Buu.

Super Buu

After Evil Buu eats Fat Buu in cookie form, he transforms into Super Buu. Super Buu gets a power increase and seems to be a lot more intelligent and talkative than his previous forms were.

Super Buu (W/ Piccolo)

When Super Buu absorbs Piccolo, his intelligence rises even further than it had before. He gains all of Piccolo's attacks, too.

Super Buu (W/ Gotenks)

Super Buu cleverly absorbs Gotenks by releasing Buu Goo from his body and surrounding Gotenks with it, thus bringing him into his own body by controlling the goo. He gains some of Gotenks powers as well as a longer head piece.

Super Buu (W/ Gohan)

After absorbing Gohan, Super Buu turns into an even stronger form. At this point, it seems the Potara fusion of Vegeta and Goku is the only thing stopping him.he is the smartest and the most cunning form of buu. his form breaks apart when vegeta pulls out fat buu from his insides.

Kid Buu

After Goku and Vegeta rescued everyone who was inside Buu, he turns into his true form... Kid Buu! This form isn't as talkative as the others, but he packs quite a wallop. He can even learn attacks just by seeing them in person.

Super Kid Buu

In a flashback we see in the series, Super Kid Buu is shown after Kid Buu absorbs South Kaioshin. He kills two other Kaioshin (North and West), East Kaioshin is able to escape before being killed. He doesn't stop there however, he absorbs Dai Kaioshin which is what turned him into Fat Buu.

Uub

After Kid Buu's defeat Goku makes a wish to have him reincarnated as a good person. Uub (Buu spelt backwards) is the result of this wish. We see him fight Goku on the very last episode of DBZ they then go off to Kami's Lookout and train for 10 years.

Majuub

In DBGT Uub fuses with Fat Buu and gains his ability to turns anything into chocolate along with Fat Buu's other moves of course. He fires his turn into chocolate move at Baby Vegeta and lets Baby turn the move back on Majuub turning him into chocolate instead. Little did Baby know Majuub is strong enough to reverse this and starts powering up inside Baby!