Super Buu is a mixture in appearance between Good Buu and Evil Buu, retaining Good Buu's skin color, but having a closer facial structure to that of Evil Buu. The jacket, cape, gloves, and black leggings of the previous forms vanish, replaced by two black arm bands with yellow linings and white baggy pants ending in black boots with similar yellow pattern ending in grayish brown shoes. He retains the majin belt of his previous form. Unlike Majin Buu's obesity and Evil Buu's thinness, Super Buu is muscular, and much taller than both of the previous forms of Buu. He is also much more humanoid, having a muscled, well proportioned body, shown often as he is shirtless for most of his appearances. Consequently, he resembles a larger and older version of Kid Buu. In the anime, Super Buu was originally depicted with white pupils like Evil Buu. It was only after Gotenks delivered a free punch to his jaw in the Hyperbolic Time Chamber that they turned red for the duration of the anime. Buu's blood is purple, though it is not seen often, as he is rubbery and can be blown to bits and survive. It is first seen in "A Whole New Gohan", after Gohan arrives and starts pounding Buu. There is also a scene when Super Buu is losing to Vegito so he is "forced" to tear holes between all the dimensions, and clenches his fist so hard it begins to bleed. It is also seen when Vegito kicks him in the face, giving him a nosebleed (to which the unstoppable Saiyan immediately mouthed off about). Furthermore, Super Buu's tongue is blue, while the original Majin Buu's tongue is colored red like that of Humans. He is arguably one of the most powerful forms of Buu around.
Unlike Good Buu, Super Buu does not feel doubt in any of his actions, and is not willing to let people inform him as to why they may be immoral, except when dealing with fat Buu's friends. Super Buu develops qualities of both Good Buu and Evil Buu, with Super Buu retaining Good Buu's short temper, tendency to act nonsensical at certain points, and urges to act violent, while also gaining a little more intelligence, something Evil Buu showed in his battle with Good Buu, as well as his stern, no-nonsense approach to matters. Two instances include Super Buu taking a break to drink soda during his fight with Gotenks, and going crazy for cake while roaming around Earth, causing Old Kai to label him a "buffoon." In contrast, killing Chichi because she got on his nerves. This trait is random though: sometimes Super Buu can detect when he is being lied to or deceived, is able to calculate the number of Humans remaining on Earth just by looking down from Kami's Lookout, and can also fool people into falling for his traps, such as tricking Gotenks into fusion to absorb the latter, and later on having a back up plan to absorb Gohan. However, on other occasions, he falls for simple tricks, is unable to understand lengths of time, and may develop strategies that fail due to their lack of development. Despite his stern disposition, he has shown to be incredibly unstable, laughing madly as he attempted to blow himself up.
Super Buu (Gohan absorbed) stated that his favorite flavor of candy is coffee. In the Ocean group's dub, his favorite flavor of candy is chocolate.
His personality also changes slightly when he absorbs someone, though he retains most of the traits mentioned above. By absorbing Piccolo, he obtained Piccolo's intelligence and speaks with Piccolo's eloquence, while absorbing Gotenks gave him a slightly cocky attitude, though it is balanced by Piccolo's intelligence. Upon absorbing Gohan, he becomes more confident and boastful.
In Budokai 2, after absorbing Frieza he gains Frieza's style of speech, intelligence, and hatred of the Saiyans. By absorbing Cell he gains his speech patterns and intelligence. By absorbing Vegeta, he takes on the Saiyan Prince's personality traits and intelligence. However absorbing both Yamcha and Tien causes him to become less confident and disappointed with his new form.
Super Buu considers himself and his previous Innocent Buu incarnation as the same person, however, he considers his pure form Kid Buu as a separate entity - with Super Buu noting that removing Good Buu from inside him will cause him to cease to exist.