Sōichirō Hague is an elderly man bearing short, pale hair and three deep facial scars contrasting his maintained muscular build. He dons glasses and traditional firefighter bunker gear during operations. Once a composed, authoritative captain of Special Fire Force Company 4, his demeanor fractures after an Adolla Link during the Great Disaster of 196 erases lifelong guilt over failed rescues, replacing it with an insatiable hunger to unravel Adolla’s mysteries—even at the cost of his life. A seasoned leader who ascended the Fire Defense Agency ranks, he trained protégés like Pan Ko Paat, preaching calculated self-preservation as vital for effective heroism. His strategic influence extended beyond Company 4: he orchestrated Company 7’s creation by persuading Benimaru Shinmon and Konro Sagamiya to align with Raffles III’s mandate, leveraging their integration into formal firefighting systems. Post-Adolla, clandestine disillusionment with the Holy Sol Temple drives him toward founding a new creed rooted in his visions. This fervor culminates in baiting Shinra Kusakabe into a violent confrontation, sparking Adolla Links with the First Pillar that expose his latent Fifth Pillar potential and attract White-Clad scrutiny. In combat, he wields firefighting equipment as deadly instruments—restraining cables entangle foes, axes strike with veteran precision. Despite advanced age, he matches enhanced opponents like Shinra in agility and endurance, surviving brutal assaults until fatally wounded as Arthur Boyle’s involuntary shield. Assassinated by White-Clad agents in his office, his staged “suicide” features self-binding cables and impaled metal shards. Final psychic echoes alert Shinra to the murder, though authorities bury the truth. Temporal reversal during the second Great Cataclysm resurrects him, erasing the timeline where his death occurred. A doppelgänger mimicking his appearance and combat prowess surfaces later, ruthlessly assaulting Company 4 until Pan Ko Paat dismantles the facsimile, condemning its hollow mimicry of Sōichirō’s integrity. His legacy intertwines with granddaughter Asako Hague of Company 6, reflecting his enduring institutional impact. Even amid ideological metamorphosis, he harbors regret over Company 4’s delayed response to an Infernal crisis, a final testament to his fractured yet persistent dedication to duty.