
Taishiro Toyomitsu works as the BMI Hero: Fat Gum, ranked eleventh on the national billboard after years spent at fifty-eighth. His Quirk makes his bulk both a wall and a battery, storing whatever force is thrown at him until he spends it on a single answering blow.
Heavy and round, he dwarfs the adults around him, and the small nose set above a very wide mouth reads oddly against the rest of his proportions. Burning the fat away exposes a different man entirely, muscular and normally built, apparently without losing any height.
He works in a zippered yellow hood over dark trousers thinly lined in white, sleeves striped and outlined in orange, his alias spelled across the chest using a clear F, a G, and one F reversed. Gloves in red-orange sit on black knuckles, the boots repeat that red-orange against yellow, kneepads combine metal with grey, and a black mask spans his eyes and brow. Earlier years brought minor variations: initials outlined in white, a heavier zipper, kneepads made wholly of metal, guards worn on the forearms.
Eight years past the war he switches to red against black, a broad F picked out in gold at the centre with a G and an M cut into the prongs. Trousers lighten, gloves turn yellow over black palms, and a little hair now shows above the hood.
He seems never to stop being hungry, and he eats to match. Civilians and colleagues get a warm, playful, unhurried version of him, but seriousness arrives the instant a situation asks for it, and the professionalism underneath has never lapsed.
Fixed on doing right, he turns impulsive and immovable, and lives at stake make him furious, restless and openly scornful of anything slow. Long cooperation with law enforcement has left him unusually literate in the country's underworld.
Potential is something he spots and names aloud. Praising Tamaki's skill only made the boy feel harassed; Eijiro earned the same after standing his ground against a villain. What governs him is people, saving them ahead of everything, plus a real attachment to anyone under his wing, and that is what makes villains endangering others enrage him. Eijiro's condition after the clash with the Eight Bullets shook him badly enough that learning the boy was fine brought him to tears.
He is more formidable than a fifty-eighth-place ranking implies. Fat Absorption lets him arrest criminals by folding them into his own frame, and size has never made him patient about finishing quickly. Standing between allies and an attack is routine, since little of it troubles him, and against power that does breach the padding he converts stored fat into a strike carrying every joule the enemy sank into him.
The ceiling showed when Kendo Rappa and Hekiji Tengai came at him. Kendo launched a hardened Eijiro away with one punch, then poured Strongarm volleys into a distracted Taishiro for the rest of the fight, and a counterpunch died against Hekiji's Barrier. Eijiro's return, absorbing the flurry himself, bought the time Taishiro needed to release everything he had banked into one blow that finished both yakuza. Come the war's end, command of the cleanup against Operation Troy's leftovers fell to him.
The raw figures are absurd. He grips several villain mechs at once and holds them, crushes hard candy barehanded, and once bruised and bloodied a suspect merely by flicking his face over wasted food. Accumulated padding lets him weather Kendo's bullet punches repeatedly, where a single one nearly overwhelmed Unbreakable. He reacts faster than his build suggests, and stayed upright fighting badly wounded long after Eijiro had dropped.
The mind gets overlooked. One look at both Quirks told him the pair were missing from the raid team's roster and that winning would be hard. A second barrage taught him that closing in stripped away his dodge and that no absorption would swallow that force, so attrition was the plan being run on him. He also knew the bickering between the two meant nothing, since a barrier would rise whenever Kendo wanted one. Years beside the Police Force gave him a grasp of procedure well beyond his peers, visible in how he untangled trafficking networks and forensics and secured a Quirk-Destroying Drug prototype for analysis, which made him central to the Nighteye Agency's case.
Fat Absorption fastens anything that touches him and sinks it into his body. The same fat banks kinetic energy for conversion into muscle, paid for with the defence it used to provide. Fataxi is the mild version, carrying anyone smaller inside him as a passenger into or out of a fight.

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Taishiro Toyomitsu, known as Fat Gum, is 29 years old during the Shie Hassaikai raid and the Paranormal Liberation War era, and 37 years old eight years later in the current timeline.
Fat Gum rose from the 58th spot on the hero rankings to No. 11 over the course of the series, working with sidekick Tamaki Amajiki and mentoring students like Eijiro Kirishima and Tetsutetsu Tetsutetsu. He fought Kendo Rappa and Hekiji Tengai of the Eight Bullets, and after the Final War he led the cleanup against the remaining Operation Troy villains.
Fat Gum's Quirk is Fat Absorption, which lets his bulk absorb and store the force of any attack that touches him. He can then release that banked kinetic energy into a single devastating counterattack.
Fat Gum's sidekick is Tamaki Amajiki, and he has mentored work-study trainees Eijiro Kirishima and Tetsutetsu Tetsutetsu. He is quick to recognize potential in young heroes and grows deeply attached to the people under his wing.
Fataxi is a technique built on Fat Gum's Fat Absorption Quirk that lets him carry a smaller ally inside his own body as a passenger, moving them into or out of a fight.
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