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|Affiliation||4th Special Fire Brigade|
Sōichirō Arg (蒼一郎アーグ, Sōichirō Āgu) is the Battalion Commander of the 4th Special Fire Brigade.
Sōichirō is an elderly looking man with short light coloured hair and three scars across his face. He wears glasses over his squinted eyes, and while on duty, wears bunker gear.
Following the mass outbreak of Spontaneous Human Combustion within Asakusa in Year 196, Sōichirō's 4th Brigade arrived to aid the civilians and to search for any remaining Flame People that might still pose a threat. While his subordinates scoured to the area, Sōichirō approached the exhausted Benimaru Shinmon and Konro. The ageing commander informed the pair of peacekeepers that Raffles III had formally decreed that their group would become the foundation of the 7th Special Fire Brigade. Despite Benimaru's objection and Konro's hesitance, Sōichirō calmly explains the many befits of this change, stating that he saw no reason to refuse for the pair to refuse. As he leaves he leaves, Sōichirō expresses that the powerful duo joining the Special Brigades would put his heart at ease.
Preacher Pursuit arc Edit
Sōichirō, alongside the seven Battalion Commanders and Fire Officers of the Special Fire Brigades, attends a meeting with Raffles III, where Adora Burst and the issues involving the Human Body Ignition Phenomenon is brought up.
Netherworld arc Edit
During a hallucination brought about by the Adora Link, Shinra Kusakabe sees the fire that killed his mother once again. In addition to seeing Leonardo Burns standing by his side, Shinra also sees a more animalistic and freshly scared Sōichirō. Sōichirō's relevance to Shinra's past is currently unknown.