The first member of this race is the original Majin Buu, who was incarnated 5 million years before Age by a wizard named Bibidi.
Body Manipulation - One of the most interesting aspects about Majin is their amorphous, shape-changing bodies that allow them to mold into and effectively dodge attacks, regenerate, absorb opponents, and liquify. Each Majin that appeared in the original manga had a different type a morphing ability: Majin Buu's round, fat body aided his defense and allowed him to inflate and regenerate dismembered parts of his body like a balloon; Evil Buu's ability appeared to be stretching and becoming very lengthy; Super Buu could liquify himself, mentally control detached parts of his body, absorb enemies, and much of everything else Majin Buu and Evil Buu could do. Kid Buu, as well as Majin Buu, showed the ability to split themselves into numerous copies.
Super Buu's absorption allows him to take on the similar facial features, clothing, and the techniques of his most dominantly powerful absorbed victims. Majin Buu is another product of absorption that wears clothing.
Skin color - Traditionally, Majin were one standard color (pink) until the appearence of Evil Buu: a manifestation of Buu's dispelled evil. However, this can be explained by the fact that Evil Buu was dispelled entirely from Majin Buu's body, and was not the traditional type of Majin
Powers
Absorption - Majin Buu fully engulfs and takes an opponent into his body to cause an increase in physical and mental prowess. Majin Buu usually has a severed body part liquefy, or he has a piece of skin fall off of his body. The goo will then sneak up behind the person, and stretch itself to be large enough to accommodate the target. The goo will then leap onto the person. The goo will try to smother as much of the target as it can on the first strike to make the capture easier. If Majin Buu is lucky, the goo will completely cover the target on the first leap. Once the goo is on the person, it will quickly cover up any part of the person that wasn't covered during when it first leaped. Once the target is completely covered, the goo will squeeze and solidify, trapping the person. It is seemingly impossible to escape the goo, no matter what the circumstances (such as Piccolo, who the goo took a long time to cover due to his armor). Majin Buu will then raise his finger up, and the goo will then launch up into the air with the person inside of it. The goo will then fly straight into Majin Buu and cover him. During the transformation, Majin Buu will become liquid himself, meaning that he is basically taking over the the goo and has surrounded the person with his own liquefied body. He then begins to meld back into solid form, making sure the person is in the center of the goo. The person is shrunken and is put inside Majin Buu's body in a pod. Kid Buu absorbed the Southern Supreme and Grand Supreme Kai's many years ago and was transformed into Fat Buu as a result.
Body manipulation + Regeneration = Majin Buu has full control over every aspect of his physical make-up, able to stretch, shape-shift, liquify, and otherwise manipulate his malleable body; useful as both an attack and defense and as a tool in absorption. He can also regenerate his body at a sub-molecular level, allowing him to survive virtually anything; however, he was unable to regenerate from Goku's Spirit Bomb since it destroyed every atom of Buu. His unrivaled regeneration plus his endless resilience and stamina granted him near-immortality; he is shown to be able to survive the blast of a planet exploding (demonstrated when he uses his planet burst to destroy the earth and other planets with him still on them). However, it is shown during the fight between Vegito and Super Buu that even his regeneration has its limits; after repeatedly being blow to bits and pounded into oblivion, Buu had to exert more and more effort to restore himself, at one point failing completely for a moment and leaving a gaping hole in his stomach.
Instant Learning - This ability doesn't actually have a name. It allows Buu to instantly and perfectly perform any skill or ability he saw. This explains how he knew Instantaneous Movement because he saw Kibito Kai perform it. This ability is shared by all versions of Buu. The limit of this ability is unknown, but he has learned such abilities like the Kamehameha, Instantaneous Movement and a skill used by Vegeta (Learned by Fat Buu). He also learnt one of Gotenks ultimate attacks and Vegeta's Galick Gun. It is also possible that he knows Vegeta's Big Bang Attack because he saw Vegeta use it. Or even the Spirit Bomb. But because he is pure evil, he may not be able to perform it. This ability also teaches him how to fight seeing as Vegeta stated that Uub was learning to fight Goku as he was fighting.