Jin Toujou, Basara Toujou's father and once recognized as the strongest hero clan member, works as a photographer. He possesses brown hair, brown eyes, and stands 1.83 meters tall. Five years prior, following an incident where Basara's powers went out of control—resulting in significant casualties and the cleansing of an evil spirit—Jin sacrificed his hero status and title to secure Basara's release from confinement. This decision forced them to relocate away from the hero clan's village.

Jin later remarried, bringing Mio Naruse and Maria Naruse into the family as Basara's stepsisters. He took them in specifically to protect Mio, the daughter of the former Demon Lord Wilbert, who is targeted by the current Demon Lord's faction for her inherited powers. Shortly after the remarriage, Jin departed overseas for work, placing Basara in charge of safeguarding Mio and Maria. Despite his absence, Jin maintains contact, such as informing Basara about the demons' true motives after Mio and Maria initially tried to drive him away.

Jin reemerges during critical moments, confronting the current Demon Lord, Lars, to negotiate or deter threats against Mio after the conclusion of the first season, though the outcome remains undisclosed. He continues operating behind the scenes, engaging in political maneuvering within the demon realm to mitigate conflicts and protect his family, playing a strategic role in the broader conflict between the hero clan and demon factions.