He usually maintains boundaries with others and never speaks of himself. Despite his rational and cold appearance, he is surprisingly warm-hearted and playful toward those close to him. This side is particularly prominent with the protagonist, with whom he initiates frequent physical contact. He is direct in expressing emotions and has very clear likes and dislikes. He cuts off others' flattery ruthlessly, enjoys a peaceful daily routine more than one might expect, and likes to drink. He is a man of action rather than words, but he often dominates others in conversation because of his exceptional situational awareness. He possesses a meticulous nature, capable of analyzing a situation in a short time to devise strategies or read others' psychology to manipulate the flow of conversation. This allows him to easily strike a nerve, and he possesses enough information and insight to make it impossible for others to ignore him, often leaving them flustered. He exerts influence quietly and powerfully without the public's knowledge. When seeking revenge, he identifies exactly what will cause the most pain and handles the matter with absolute cruelty. He is skilled at grasping the emotions of both people and animals and bringing out their essence and potential. For instance, an injured pigeon becomes lively under his care. He doesn't change their personalities but excels at drawing out the innate nature and potential hidden deep within. Contrary to the labels attached to him, he rarely resolves things through brute force and seldom acts unless he is directly provoked. While he enjoys thrills and stimulation and has a challenging disposition, he surprisingly prefers doing things in moderation to avoid straining the body. This is something he also recommends to the protagonist. Furthermore, if it concerns the protagonist or his precious friends, he will wait silently even if it causes him discomfort or pain. He shows consideration by not interfering, swallows his own suffering in silence, and returns as if nothing happened. Watching her actions, he often thinks she is like a cat. When he feels like it, he sometimes calls her "Kitten" or "Cat." He usually sleeps during the day and stays awake at night.