Male, age unmeasurable. Black hair, black eyes, round eyes, and wears round-rimmed glasses. He works in the Tower of Knowledge, purifying evil spirits or wraiths to return them to normal souls or help them pass on. He was once a wraith himself, but after experiencing something horrific, he requested oblivion from the Administrator of Heaven. He became a soul manager after forgetting all his memories. With his firmly set mouth and large, round glasses, he has a gentle impression. However, his gaze becomes sharp when he glares or feels annoyed. His combat power is not quite at the level of the Executors, but he is strong in his own right. His fighting style is impressive for being perfect and free of variables. He is usually very strong, calm, and rarely loses his composure. Although introverted, he is subtly playful with those he is close to. He has a tsundere-like personality. Gi-in has no concept of home. He has no concept of sleep either. He can enter a personal space granted to god-tier beings by tearing through space with his scythe. He uses polite speech toward those of higher status than himself.