Background
The fat version of Majin Buu is the result of Ultra Buu's absorption of Grand Supreme Kai, the supreme ruler of all Kais. The merging of the juvenile and immature Kid Buu with the benevolent and innocent Grand Supreme Kai resulted in a childlike carefree being who, despite his behavior, possesses power that far surpasses that of a Super Saiyan 2 and on par with a Super Saiyan 3. Of note, absorbing Grand Supreme Kai granted Majin Buu the ability to speak fluently, although he usually refers to himself in the third person. Buu became calmer and easier to control after absorbing the Grand Supreme Kai.
However, Buu would become disobedient at times, causing his master Bibidi to seal him inside a magic ball to control him and transport him from planet to planet. Bibidi brought the ball to Earth, which was intended to be his next target. The only remaining Supreme Kai, Shin, waited for this chance, and, before Buu's seal was released, he was able to kill Bibidi. The ball, in which Majin Buu is contained, remained sealed, without being destroyed. Shin and Kibito thought it best to not unnecessarily disturb it and moreover, the only one who could release the seal was the now-deceased Bibidi.
Though seemingly gone, the stories of Buu's rampage continued to spread throughout the universe, striking fear into even the likes of King Cold, who told his son Frieza never to cross Buu.
Dragon Ball Z
Majin Buu (in his fat form) is first introduced during the Babidi Saga. He was released from his Sealed Ball by Bibidi's son, Babidi, thanks to the energy collected from Majin Vegeta and Goku as they were fighting. Despite Babidi's involvement in freeing him, Buu for the most part ignored him, although he quickly accepted him as his master when Babidi reminds him that he can seal Buu back into the Sealed Ball. In addition, he gets angered at Dabura's claims of him being a "bumbling idiot" and proceeds to humiliate him in battle. He is then ordered by Babidi to execute Gohan and Shin.
Thinking quickly, Gohan grabs the Supreme Kai's hand and flies away, hoping he can outrun Buu until they can reach a safe spot. However, Buu swiftly appears right in front of Gohan and mocks him. The Majin swats the half-Saiyan out of the air and into the rocks. Shin looks in shock as Buu begins to menacingly approach him. Shin uses a Kiai to defend himself, but the attack barely pushes Buu back. In response, Buu pummels the Supreme Kai as an injured Gohan watch.
Babidi proceeds to mock Shin for the position he is in and decides to kill the Supreme Kai himself. Just before Babidi can deal the final blow, Gohan swiftly kicks Majin Buu in face, much to the wizard's surprise. Unimpressed, Buu gets back on his feet and proceeds to heal the dent in his face. The cowardly wizard quickly retreats and is frustrated at the delay of the Supreme Kai's death. Gohan looks onto Buu in fear, noticing the attack did not leave any lasting damage. Buu becomes annoyed with Gohan and exclaims that he will die now. Gohan is shocked, but quickly gets angry, preparing to punch the pink monster. Buu quickly fires a large sphere of energy that blasts Gohan into the sky, before eventually flying off too far to be visible to a naked eye. With the last of his strength, the weakened Shin uses his psychic powers to destroy the attack and a beaten Gohan falls down into a nearby forest, unconscious and near death. His sudden decrease in energy causes several characters, like Goku and Vegeta, to mistakenly believe that Gohan was killed by Innocent Buu.
Thinking Gohan is dead, Babidi tells Buu to finally finish off the Supreme Kai. A hungry Buu prepares to turn the Supreme Kai into food, but from the rubble, an injured Dabura returns and throws his spear through Buu's back. Babidi gasps in surprise, truly believing Dabura to be dead after Buu struck him. He then yells at Dabura for daring to attack his father's creation. Dabura informs Babidi that Majin Buu's unpredictable nature is it not to be taken lightly and he will eventually betray the wizard and become a true threat. Dabura says they should stop the creature now while they still have a chance, but Babidi ignores the demon's warnings and scolds him for daring to attack Buu to begin with. However, Buu grabs the spear with no concern and simply pulls it out of his stomach like it was nothing. Dabura is horrified by Buu's near immortality, while the creature heals the hole in his stomach. Majin Buu turns to Dabura with an unfriendly smile, happily exclaiming that Dabura shall be eaten. Dabura futilely attacks Majin Buu, but monster uses his Transfiguration Beam to turn the demon king into a cookie and devours him whole.
Astonished by the creature's power, Babidi praises Buu and orders him to eat the Supreme Kai as well. Before Buu can eat Shin, he is distracted when Vegeta arrives and destroys Babidi's Spaceship. Babidi begins to scream at the loss of his spaceship and scolds Vegeta for his actions. Vegeta turns to Buu and begins to question the Majin, calling him a repugnant blob and ordering him to answer if he was the one who killed Gohan. Not understanding what "repugnant" means, Buu asks his master what the meaning of the word is. Hearing Babidi's explanation, Buu turns his view to Vegeta and begins to anger, letting out bursts of steam from the holes in his head. Screaming that he will kill Vegeta, Babidi congratulates Buu's violent temper and orders him to teach Vegeta a lesson for betraying him. As Buu's ki increases even higher, Vegeta powers up as well. Believing that he will die, Vegeta claims that if he has to go to Hell for fighting this battle, he will be bringing Buu and Babidi with him.
The fallen Saiyan puts up a good fight, managing to cause a noticeable amount of damage to Buu, which leads Buu to realize that he would have to be serious against Vegeta, so he uses Angry Explosion which severely damages Vegeta. Buu tells Vegeta that it's over for him and rips out a chunk of his stomach and stretches it out like gum. While Vegeta is confused by this, Buu shoots an explosive blast from his mouth that the prince just barely dodges, and then throws the piece of his stomach out so that it wraps around Vegeta, immobilizing him. The helpless Vegeta is then tortured by the fat creature. Luckily, Vegeta is saved through the intervention of Trunks and Goten. Despite Trunks' attempts to convince his father that by fighting together, they would win, Vegeta knocks both Trunks and Goten out. After sharing one last conversation with Piccolo, Vegeta decides to sacrifice himself in order to defeat Majin Buu for good. He blows himself up in a last-ditch effort to kill the Majin, and the explosion leaves Buu reduced to tiny pieces.
Later, Piccolo returns to the aftermath of the explosion, and prepares to finish off an injured Babidi, only to discover Buu's regeneration is virtually limitless and he returns to life from the broken pieces. Piccolo quickly escapes before Buu can finish healing. Babidi, near death from Piccolo's earlier attempt to kill him orders Buu to heal his body. Buu then reluctantly heals Babidi, after the wizard again threatens him with sealing him back into the Sealed Ball. Together, he and Babidi go on a rampage throughout Earth searching for Goten, Trunks, and Piccolo for their individual parts in almost ruining Babidi's plan and telepathically threatening the people to give up them up. While Buu is content causing mass destruction, he is quietly annoyed with Babidi's constant complaining and insults.
Their rampage is later interrupted by Goku, who intends to halt Majin Buu from destroying West City, as Trunks needs to find the Dragon Radar there. Babidi shows his surprise, believing Vegeta had killed Goku in their battle and thanks him for his part in reviving Majin Buu. Goku compliments Buu on his unmatched power, admitting that both he and Vegeta were wrong to underestimate him. Babidi immediately changes the subject, demanding to know the whereabouts of Piccolo, Trunks and Goten. Goku naturally refuses but offers them both a firm warning: The three in question will show themselves, but only after completing their training to defeat Buu, so they both should wait until then. Buu and Babidi both laugh loudly at the idea. The wizard refuses to listen and once again demands their presence, or else they'll kill more people.
Anticipating this, Goku prepares to stall Buu. Babidi orders his minion to kill him like Vegeta. Buu, however, doesn't listen and laughs to himself. Babidi yells at him and Buu frustratingly complies. Goku takes notice of Babidi's cruel treatment toward his servant and asks Buu why he still obeys the weak wizard and listen to his constant, demeaning insults. Buu himself pauses and begins to ponder on Goku's point. Intimidated, Babidi threatens Buu with sealing him away back in his cocoon prison, but Buu retorts and says Babidi will not do that, because Goku could easily kill him without Buu in the way. Babidi feels threatened by Buu's growing intelligence, however, Buu wishes to kill Goku anyway and obeys Babidi's demand, but only for the enjoyment of killing good guys.
Goku takes his time by showing Majin Buu the Super Saiyan transformations. First, Super Saiyan 1, Super Saiyan 2, and then decides to finally reveal the latest form: Super Saiyan 3 transformation. As Goku manages to overpower Buu when they start their fight, Majin Buu still treats the battle as playing, healing every wound Goku gives him. Goku and Buu both manage to land decent attacks on each other, as Buu uses attacks he has learned from other Z Fighters, including Vegeta. Buu even learns the Kamehameha technique after watching Goku use it only once. As Buu and Goku continue their enormous struggle, Goku fires an attack towards Buu, but Buu manages to deflect it back to the nearby city, completely destroying it. Throughout the fight, whenever Goku manages to get the upper hand on Buu, either by throwing him into the city or evading one of his attacks, Babidi gives Buu a harsh scolding, calling him insulting names. Buu eventually orders Babidi to be quiet, and Goku realizes that despite obeying Babidi's orders, Buu completely hates his master. Goku halts their fight after Trunks successfully finds the Dragon Radar. When Buu asks Goku to fight again, Goku informs Buu that in two days there will be another strong fighter to face Buu and give him a challenge. Majin Buu remembers this throughout his transformations and awaits this fight. Before he leaves, Goku tells Majin Buu to stop taking orders from Babidi, considering their enormous difference in strength and power.
Right after Goku leaves, Babidi insults Buu for not finishing him off, calling him names, which pushes Buu over the edge. Majin Buu turns on Babidi, strangling him to ensure he can't say the incantation for the Sealing Spell, before murdering him by decapitating him with a punch. After this, he cheers in joy and dances to celebrate his freedom. Not knowing what to do now that Babidi is dead, Buu proceeds to continue his murderous rampage, this time out of fun, where he destroys city after city. During his rampage, Buu meets a girl he is interested in, but after she is unwilling to accept him, he turns her into candy and eats her. Later, Buu meets a blind boy named Tommy. Upset that Tommy does not run away scared, Buu heals the boy. However, the boy still treats Buu with kindness. In return, Buu brings a carton of milk (in fact, an old man he turned into a carton of milk) for Tommy.
A day later, he is challenged by Gotenks and quickly defeats him. He then builds a house made out of humans and animals he turned into clay, where he meets Mr. Satan who attempts numerous times to kill Buu through poison, explosives and even physical assault, all of which fail so miserably that Buu does not even realize that they are assassination attempts. Mr. Satan eventually gives up and begins performing maid services for Buu such as cooking for him and giving him baths. During this time, Gotenks returns as a Super Saiyan to challenge Buu to a rematch, however, the arrogant fusion wasted too much time prior to his arrival, and quickly defuses into Goten and Trunks, who hastily retreat.
While he is living with Mr. Satan, Buu finds a hurt dog by the side of the road and brings it to Mr. Satan, perplexed at why it was not running away from him. Mr. Satan tells him that the dog is hurt, so in response, Buu heals him with his magic. The dog, who he names Bee, becomes the first creature to show affection to Buu and the first creature Buu shows genuine love for, such as licking him. This causes Mr. Satan to stop trying to kill Buu and instead try to find out why he murders people. Buu tells him that he just does it because Bibidi and Babidi told him to destroy. Mr. Satan tells him that killing people is actually wrong, which surprisingly shocks Buu, who then promises never to do any harm again.
After taming Buu, it seemed that the world is saved by Mr. Satan. All is well until the two gunmen Van Zant and Smitty arrive with the goal of taking on Buu and shoot Bee as he is playing with Buu. This causes Buu to become more enraged than he has ever been, but this anger is quelled by Mr. Satan's disposing of the two gunmen and taking Bee back to Buu to be healed. The situation seems fixed as Buu rebuilds his house in the shape of Bee and Mr. Satan resumes his maid tasks. Buu now seems fully changed, playing with Bee and even asking Mr. Satan to sit and eat with him. Mr. Satan even destroys the fake pictures of Buu defeated that he had taken. This lasts until the gunman who shot Bee returns and shoots Mr. Satan in the chest. Buu is able to heal him but the pain of losing his best friend is so great that he struggles to control his anger. Buu weakly tells him to run far away with the puppy, or they'll die. Mr. Satan doesn't understand, and Buu yells at him to hurry. Mr. Satan runs off with the Bee, as an angry Buu releases steam that forms into a giant cloud overhead. Finally, Buu loses control of his anger, and splits into Good Buu and Evil Buu.
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