Allen Kay, a researcher forcibly enlisted by the terrorist group Humarise to advance their goal of exterminating Quirk users, bears a disheveled appearance with dark brown hair, piercing gray eyes, and an eye patch concealing a scarred right eye. Clad in a white shirt, brown pants, and practical shoes, his unassuming facade masks a perilous mission. Kidnapped under threats to his family, Allen was coerced into engineering Trigger Bombs—devices designed to release Ideo Trigger gas, which fatally destabilizes Quirks. His colleague Eddie Soul covertly crafted a deactivation key to counter the bombs, but Humarise executed Eddie upon uncovering his defiance. Allen seized the key and fled, determined to expose the organization’s genocidal plot. Disguised as a Humarise operative during his escape, he concealed the key within a puzzle box inside a briefcase. Pursued by the archer Beros, he crashed during a high-speed chase, losing the briefcase, which was inadvertently swapped with one belonging to courier Rody Soul. Severely injured, Allen was hospitalized under police guard, rendered mute by his critical condition. A recorded message hidden in the briefcase exposed Humarise’s scheme: the bombs served as decoys to ambush global heroes, while Eddie’s sacrifice in creating the key—and his identity as Rody’s wrongly presumed absentee father—was revealed. The plea within the message urged the finder to activate the kill code, sparking a race to dismantle the bombs. Allen’s resolve to atone for his coerced role catalyzed the protagonists’ efforts, his defiance against insurmountable odds underscoring a desperate bid to avert worldwide catastrophe.