Mash Burnedead was born without magic in a society where magical ability dictates status. Abandoned as an infant for lacking a magic mark, he was found and raised in seclusion by Regro Burnedead. Regro subjected him to intense physical training from early childhood to ensure his survival, including evading assassination attempts by Domina. This lifelong regimen forged extraordinary physical capabilities. Authorities led by police officer Brad Coleman eventually discovered his condition, shattering his peaceful life with Regro. To escape execution and protect his adoptive father, Mash agreed to enroll at Easton Magic Academy, aiming to become a Divine Visionary – a position granting legal authority to overturn laws against non-magical individuals.
He possesses a muscular build, pale skin with a slight tan, black bowl-cut hair, and yellow eyes. Brad Coleman initially placed a fake lightning bolt-shaped magic mark on his left cheek for concealment, later removed. His standard attire is the Easton Magic Academy uniform: white shirt, black trousers, red tie, brown shoes, and black cloak. During training, he wears a black skin-tight under-armor bodysuit with white shorts, often barefoot. Key equipment includes his Iron Wand – an extremely heavy rod he shapes into sports equipment using brute strength – magic wrist weights initially used to restrain his power (which he outgrew), and cream puffs, his favorite food, which he constantly carries.
His personality blends stoicism and kindness, typically showing minimal facial expression regardless of circumstance. He displays innocence, obedience, and blunt honesty, often missing social cues or making unintentionally tactless remarks. Academically, he struggles significantly due to lacking prior formal education and an inability to process complex information, leading to overload. He dislikes studying but demonstrates surprising resourcefulness in combat, employing pragmatic strategies. He strongly values peaceful resolutions but becomes fiercely protective when friends or family are threatened. While viewing his physical training as necessary rather than enjoyable, he maintains rigorous discipline. His motivations evolve from seeking personal safety to aspiring for broader societal change.
His abilities stem from intense conditioning, termed "Muscle Magic" as a parody of spellcasting. Feats include deflecting magical attacks, catching blades with his eyelids, and crushing advanced spells through sheer strength. Specific techniques include Big Bang Dash for extreme speed, Ballista Knuckle for powerful strikes, Hell Fall for aerial slams, Guillotine Kick for immobilized opponents, and Hurricane Rush combining multiple muscle-group attacks. Advanced forms are Unlimited Physical Mode (removing wrist weights for maximum power) and Weakness Mode (achieving flimsy evasion through muscle fiber control). Other abilities encompass sports expertise, carpentry skills demonstrated in infancy, and unique maneuvers like the Special Art Body Substitution Jutsu using clothing as decoys.
He forms significant relationships: Finn Ames becomes his first friend and roommate, often acting as the straight man to his antics. Lemon Irvine develops romantic feelings after he assists her, frequently referring to herself as his future wife. Rivalries develop with Lance Crown, who aims to become a Divine Visionary to save his sister, and Dot Barrett, a hot-tempered classmate. Key adversaries include Abel Walker, Lang Dorm's prejudiced prefect, and members of the dark organization led by Innocent Zero—later revealed as his creator who intended to use his body for immortality. In the final conflict, he defeats Innocent Zero but spares him, offering lifestyle advice instead of fatal punishment, reinforcing his preference for non-lethal resolutions.