Taishiro Toyomitsu, known professionally as the BMI Hero Fat Gum, holds the rank of Japan's current No. 58 Pro Hero. His extensive collaboration with law enforcement granted him deep insight into criminal networks and forensic procedures. Early in his career, witnessing All Might during an Osaka villain rampage inspired him to maximize his quirk's potential by deliberately increasing his body mass through excessive calorie consumption, directly enhancing his hero work. These police connections later facilitated his involvement in operations like investigating the Villain Factory's Trigger drug network, partnering with undercover agent Monika Kaniyashiki and Eraser Head during raids on pharmaceutical facilities and the Tokyo Sky Egg incident. Standing approximately 250 cm tall in his primary form, Toyomitsu possesses a distinctly round physique featuring a wide mouth and smaller nose. His hero costume includes an orange or yellow zippered hoodie displaying stylized "F" and "G" lettering, metallic boots, gloves, and an eye-covering mask. When unleashing stored kinetic energy offensively, his body sheds fat reserves to reveal a concealed muscular build beneath, though his exact height in this form varies. Personality-wise, Toyomitsu exhibits a generally carefree and approachable demeanor, frequently consuming large quantities of food like takoyaki to fuel his quirk. This affable nature shifts dramatically during crises into intense determination focused on minimizing civilian harm. He displays impatience with protracted strategizing when immediate action could save lives, objecting during Sir Nighteye's planning sessions for Eri's rescue. His mentorship blends practical guidance with emotional support, providing specialized meals for Tamaki Amajiki's quirk maintenance and openly acknowledging Eijiro Kirishima's heroic potential after their shared battle against the Eight Bullets. His transformation-type quirk, Fat Absorption, allows him to absorb physical matter and kinetic energy upon contact. Defensively, he traps assailants within his body fat and shields allies through his immense bulk. Offensively, he stockpiles impact energy from sustained assaults, releasing it in concentrated counterattacks; this process permanently consumes fat reserves and temporarily diminishes his defenses. His Ultimate Move, "Fataxi," transports multiple individuals by enveloping them within his body for protected mobility. Enhanced physical attributes complement his quirk, including significant strength, speed disproportionate to his size, and exceptional stamina. His notable operational involvement includes the Shie Hassaikai raid, accompanying interns Tamaki Amajiki and Eijiro Kirishima. Separated by Mimic's quirk, Toyomitsu and Kirishima confronted Kendo Rappa and Hekiji Tengai. He intentionally absorbed Rappa's barrage to accumulate energy while coaching Kirishima. When Kirishima created an opening, Toyomitsu expended all stored energy in a single punch that shattered Tengai's barrier and defeated both yakuza members, reducing himself to a weakened muscular state. During the Final War, he commanded operations against remaining villains following Operation Troy. Toyomitsu participated in the Gunga Mountain Villa raid, utilizing Fataxi to transport allies like Denki Kaminari and Fumikage Tokoyami. His investigative contributions proved critical during the Shie Hassaikai case, identifying connections between quirk-erasing bullets and criminal organizations after Tamaki was injured by a prototype projectile.