Body Manipulation – Majin Buu has has complete control over the movements and functions of his muscles, bones, veins, etc. being able to move with remarkable grace, athletic and acrobatic skill. He can control his flesh and blood to move at command, which allows him to take control over his motions, augment himself. He has full control over every aspect of his physical make-up, allowing for immense flexibility and agility, and limited shape-shifting.
Instant Learning – Buu can gather and assimilate any kind of knowledge and understand it fully and instantaneously, 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 Good Buu). Even in death, this ability is retained by Kid Buu's reincarnate Uub, as Vegeta stated that Uub was learning to fight Goku as he was fighting.
Regeneration – He can regenerate his body at a sub-molecular level, allowing him to survive anything; however. His regeneration plus his endless resilience and stamina granted him 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 while still on them). However, it is shown during the fight between Vegito and Super Buu that even the 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. Kid Buu's regeneration is used to illustrate the Super Regeneration on a card in Dragon Ball Z: Battle of Z.
Unknown, unfathomable power – Buu possess an odd ki signature that makes it hard to tell how strong Buu really is. Whether Buu's power level is incredible, or not that much is unknown even by Majin Buu.
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 was not 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 goo and has surrounded the person with his own liquefied body. He then begins to meld back into a 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 many years ago and was transformed into the fat Majin Buu as a result.
Ki Blast – The most basic form of energy wave. This was the first attack Kid Buu used in the series. Although a basic attack, when used by Kid Buu it still had enough power to destroy a planet the size of the Earth.
Mystic Attack – The ability to extend his arms or legs. Kid Buu uses this to attack Vegeta, enlarging his fist and then Vegeta to choking him. He also uses the Mystic Attack in video games, and is notably shown using it to grab Gotenks by the neck in the opening of Dragon Ball Z: Budokai 3.
Mystic Shoot - Kid Buu's signature attack in the Raging Blast series.
Electric Shock – Kid Buu creates electricity on his body and then channels it through his arms to shock his opponent. Used in combination with the Mystic Attack to torture Vegeta.
Mystic Ball Attack – Buu curls himself up into a ball with his legs above his back and his feet below his chin and flies around using himself as a weapon to crash into enemies. Kid Buu used this technique against Super Saiyan 3 Goku only in the anime, and in video games.
Vanishing Beam – A technique used many times by Majin Buu and is his signature technique. It is usually an average-sized, pink or purple beam fired from the palm. It also has enough power to destroy a planet the size of Earth.
Gack! – Kid Buu fires a powerful energy blast from his mouth. He first used it in his Huge Buu form against the Eastern Supreme Kai, who was saved from it by the Grand Supreme Kai. He later used it in his original form against Goku and Vegeta.
Antenna Beam – A technique where Kid Buu fires an energy wave of unknown properties from his antenna. Kid Buu attempts to use the attack on Super Saiyan 3 Goku, though Goku just manages to dodge out of the way of the attack.
Kamehameha – A technique copied when Goku used it. Kid Buu uses the attack on Goku during their battle on the sacred planet of the Kais.
Mad Kill Spike – Buu fires many ki waves at at the opponent. Kid Buu has his own unique version during which he splits into hundreds of Kid Buus that fire Continuous Energy Bullet, creating a monsoon of energy waves. Named in the Budokai series, where Kid Buu uses Continuous Energy Bullets without splitting.
Pearl Flash – An attack used by Kid Buu against Good Buu in which he surrounds himself in energy and rushes forward like a rocket. This attack vaporized Good Buu's neck and up, but he regenerated.
Planet Burst – A massive energy sphere created by Kid Buu by collecting energy in his right palm, more than enough to destroy a planet the size of Earth, and stated by Goku to have enough power to destroy Earth ten times over in a single shot. It was used to not only destroy Earth, but many other planets, as Kid Buu sought out the place where Goku and Vegeta were hiding. This technique is called Vanishing Ball in the Budokai series, and was named Planet Burst in the Budokai Tenkaichi series. In the Budokai series, Kid Buu uses a version called Warp Kamehameha where he fires a Kamehameha push the ball to the opponent. It is also called Death Ball, only in the first Dragon Ball Z: Budokai Tenkaichi.
Shocking Ball – Kid Buu uses a smaller version of the Planet Burst on Grand Kai's planet against Pikkon, Olibu, Krillin, Yamcha, and many other fighters. Named in the Raging Blast games, where it appears as on of Kid Buu's Super Attacks.
Double Blast – A barrage of ki blasts used to torture Goku when he was unable to throw the Spirit Bomb since Kid Buu was holding Vegeta hostage. Named in the Dragon Ball Z Collectible Card Game.
Crazy Smash – Kid Buu kicks the opponent up in the air, then he kicks and punches them down again, and finally Kid Buu kicks his opponent in the back when he is down. Used in the Budokai series.
Massacre of the Billions and Millions of Bountiful Mini Bitty Malliciously Baneful Majin Buus – Kid Buu splits into many Kid Buus and they all fire energy waves. Used against Goku, and later Vegeta. Named in the Dragon Ball Z Collectible Card Game.
Instantaneous Movement – Kid Buu teleports himself to a location of his choosing. Kid Buu learned this technique by watching Kibito Kai perform it. In the anime, this technique is called "Instant Transmission". It is one of his Blast 1 in the Budokai Tenkaichi series.
Sleep – Despite having seemingly endless stamina, Kid Buu does need to rest from time to time. Evidence of that was shown when he fell asleep while Goku and Vegeta played Rock-Paper-Scissors to see who would fight him first. This is probably due to his galactic destruction spree before he managed to track down his targets. Another scene of him taking a break is while he was beating on Good Buu. He stopped, sat down, and exhaled an exhausted sigh before he continued his beating. It is one of his Blast 1 in the Budokai Tenkaichi series.
Unnamed Black Orb technique – An unnamed technique which Kid Buu uses in the opening of Budokai Tenkaichi, Kid Buu raises his arm into the air, shooting multiple beams which hit Cell, the Cell Jrs., Piccolo, Ultimate Gohan, and Frieza, and then Kid Buu create a massive black orb and charges at the opponent. Goku defeats him with a Kamehameha, breaking through the orb.
Paralyzing Gaze – Buu narrows his eyes and stares at his foe, and due to his raw power the foe is rendered almost completely immobile. Only works on foes who are much weaker than he is.
Cloning – Buu is capable of creating at least twelve clones of himself in order to aid him in battle against an opponent.