Sojiro is serious and a bit cold to the protagonist in the beginning, begrudgingly taking him in as a favor to a friend. Like many characters in the beginning of the story, he is cautious of him due to his probation, even stating that he will do very little if the protagonist gets himself into trouble. He is a rather cynical person, warning the protagonist that he should be careful who his friends are and chastising him for getting involved in the affairs of others, even if he was trying to do the right thing. However, Sojiro seems to have a soft spot for cats, as he instantly changed his mind about throwing Morgana out of the house, after hearing him meow, claiming that he was just too damn cute. He also made him something to eat right away, despite claiming that feeding him was the protagonist's responsibility.