Tamaki is a tall young man with rather pale skin. His ears are longer than most, their tips pointy and somewhat elf-like. He has messy, indigo hair, which sticks out behind his head, and thin, tired-looking eyes, partially covered by his bangs despite the fact that they're supposed to be split as to not impair his vision. His shoulders are usually hunched, and he avoids making eye-contact with people.
When wearing his school uniform, Tamaki wears his outfit in a slovenly way. His tie isn't tightened all the way and his shirt isn't completely tucked in as it should be, making it seem as if he doesn't put much effort into his appearance.
Tamaki's hero costume consists of a black bodysuit decorated with gold plating around the arms and shoulders. He dons a white tunic as well as a matching cape and hood that features more gold plating on the top of the hood. The cape connects to a scarf-like collar that features a silver mask on the front. He also sports a purple mask over his face as well as a matching carrier vest with red straps. He wears a mask over his eyes and has no shoes, which gives him more freedom when he’s using his Quirk.
Tamaki is extremely shy, aloof, depressed, "intimidating" and introverted, especially around audiences. He gets nervous very easily when talking to other people. If his anxiety gets the best of him, Tamaki will often face away and lean into a wall to hide his face from others. This also happens whenever Tamaki has a bad feeling or feels insulted.
While his physical abilities and Quirk are outstanding, Tamaki is very socially awkward and lacks confidence in his own powers. He apparently feels overwhelmed by the pressure to be perfect and this has damaged his self-esteem. Tamaki is quick to point out when others are being too optimistic in his pessimistic opinion and is unable to recognize his own achievements. His pessimism is a direct contrast to Fat Gum's optimism. Even after being complimented by Fat Gum, Tamaki often takes his mentor's praise for taunting.
Despite his timid heart, Tamaki is fully capable of showing flashes of bravery. Even though he's always been a shy and reserved boy, Tamaki was able to hone his skills and climb the ranks into one of U.A.'s Big 3. Mirio Togata is a big inspiration for Tamaki, and their cooperation throughout their lives has lead Tamaki to establish his own set of stern beliefs which he will uphold and vocalize.
Tamaki does not believe anyone should undermine another person's hard work. He noticed Class 1-A could not recognize how much work Mirio put into honing his own power, and even showed his face to comment on it.  Mirio often gives Tamaki the inspiration to act even when he's feeling anxious. Inspired by Mirio's bravery during the yakuza raid, Suneater shows a bright flash of bravery, stepping up to the challenge of facing three villains alone so that the others can complete the mission.
While fighting against the villains, Tamaki pushed himself to his limit so that he could uphold the expectations set on him by Fat Gum, Mirio, and others who believe in him. Tamaki voiced his disapproval of the way Toya Setsuno, Yu Hojo, and Soramitsu Tabe consider themselves expendable to Overhaul, but he appears to understand the bond between allies very well.
Overall Abilities: Tamaki is one of U.A. High School's most powerful students alongside Mirio Togata and Nejire Hado, who are all collectively known as The Big 3. Tamaki has been stated to have skills and abilities that far outclass that of most Pro Heroes.
Tamaki has mastered his Quirk, Manifest, through vigorous training. He possesses the ability to manipulate feature selection, size manipulation, and simultaneous manifestations. This gives Tamaki's fighting style incredible variation and unpredictability. Tamaki makes sure to eat plenty of Takoyaki and Clams every day because they're great for both offense and defense. He often uses tentacle fingers to bind his opponents and defends himself using a clamshell husk. Tamaki has a variety of other powerful combinations as well, including using chicken talon strengthened with octopus muscles, or tentacle fingers reinforced by crab shells. Fat Gum believes Tamaki's abilities are above his own and an entire team of heroes that included Pro Heroes Eraser Head and Rock Lock.
Tamaki has proven his strength on multiple occasions. He was able to effortlessly neutralize dangerous villains before having his Quirk temporarily erased. Tamaki was even capable of defeating Toya Setsuno, Yu Hojo, and Soramitsu Tabe of the Eight Expendables in a three on one fight by pushing himself to the limit.
Tactical Intellect: Tamaki demonstrates incredible tactical judgments during fights. He acted quickly to disarm three villains at once in order to tip the favor to the heroes. When he was overwhelmed by three of the Shie Hassaikai, he managed to counter all three of their Quirks and used their advantage against them in order to win.
Tamaki's Quirk is only limited by what's still in his system. Tamaki must use his food before it digests, and its potency depends on how much of it he eats. He must replenish his system every day and needs to decide on what foods to eat before training or getting into a fight.
- Chimera Kraken (キメラ・クラーケン Kimera Kurāken?): Tamaki's arms change into a pair of four incredibly large tentacles coated in barnacles, which he uses to thrash in a large area, hitting multiple opponents.