Seto Narukami commands the Seto Platoon as a Captain within the Other Suppression Force, ranked Seventh Class Septentrion. A master of electrokinetic combat, he wields dual kodachi to channel paralyzing electrical strikes and debilitating status effects. Renowned for his battlefield prowess, he rejects promotions to remain on the front lines, valuing his subordinates’ safety above personal advancement. Leading five operatives—including Yuito Sumeragi, Nagi Karman, and Kagero Donne—he balances humility with approachable cheer, prioritizing swift aid to allies over hierarchical formalities.

A fountain pen gifted by Karen Travers serves as a cherished keepsake, briefly lost during a Kikuchiba mission before its retrieval by Kasane Randall. His resolve is tested during the Suoh Incident, where he confronts Travers to decipher her motives, and culminates in the Kunad Highway clash. There, he intercepts Nagi Karman’s lethal aerokinesis to shield Yuito and Kasane, sustaining fatal wounds—an act of sacrifice emblematic of his lifelong oath to protect his team, shaped by decades of combat experience.

With over 25 years of service in the 542nd OSF Division (ID: MNS542108), Seto’s age exceeds 41, though standard OSF anti-aging treatments retain his youthful vigor. While his origins remain unrecorded, his legacy endures through unwavering ethical leadership and camaraderie, indelibly shaping those under his command.