“Sojiro is cold and strict to the protagonist upon first meeting him, 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 and threatens to kick him out if he violates his probation. 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, as the protagonist continues to live with him, Sojiro slowly builds trust in him, allowing him to go outside at night, first around the area then anywhere around Tokyo and even beginning to teach him to make Leblanc's signature coffee and curry. He also begins to joke around with the protagonist more, seeing that the protagonist is not the delinquent that his probation makes him seem like.” - Persona 5 Wiki

Voice Example

https://www.youtube.com/watch?v=ZIlNhvSVaI8