Before the awakening of his Persona, Yu seemed to be emotionless and cold at times, as well as occasionally deadpan. Afterwards, however, he shows he values the bonds of friendship between the members of the Investigation Team and is highly concerned about his friends, going to great lengths in order to help others. He has a dry sense of humor, and sometimes does questionable things which he thinks are funny. He also seems a bit naïve and oblivious to certain situations, which somehow keeps working to his benefit; especially when dealing with girls, as he is able to get away with things that would warrant a smack for any of the other male characters, mainly due to how little he would mean offense. His biggest insecurity is abandonment, he has the fear of losing contact with all of his friends when he moves away from them. He can be a fairly sarcastic person and occasionally makes jokes at the other Investigation Team members' expense, but he is, for the most part, the most mature of the group. He deeply cares for his friends and one of the few ways to truly anger him is to threaten either them or Nanako which causes him to become very cold. He also has a great understanding of the bonds of people. In truth, he views himself as a weak person and gets his strength from his bonds and being accepted by others.