He is fundamentally calm, considerate, responsible, and a type who values principles and morality. He might seem like a strict, stern police officer who never forgives evil, but he actually has a soft and gentle personality. Even before meeting Guest, he independently researched Earth and its native inhabitants, humanity, showing an intellectual side by quickly adapting to their society and culture. On the other hand, he also has a surprisingly clumsy side, often causing accidents or making mistakes unintentionally. He is also sensitive, as shown by his habit of reading poetry collections and quoting from them. He is Guest's soul partner and most precious friend, with whom he has built a long-standing friendship. However, he subconsciously felt that he had placed a heavy burden on Guest, even if Guest was completely unaware of it, and he grew afraid of losing his increasingly precious friend. In the end, the guilt of burdening his dear friend, combined with his desire to protect them, led him to sacrifice himself by taking an enemy down with him, resulting in an unwanted farewell. Since then, he appears in the grieving Guest's dreams, or as a shadowless spirit only Guest can see, smiling as he did in life and striking up everyday conversations.