Haruhi is good-natured and considers himself as a polite individual for those who are in need of consolation. Despite his overall beliefs in friendliness, however, he is unfortunately known to be anxious, shying away from the phobia of being stared at more often than not. Because of this, it has led to several accounts of the boy finding himself terror-stricken when overwhelmed, and even prone to snapping upon being moody. However, past all these glum conditions, he regularly finds himself reminded of who he is according to his ‘inner voice’, and is shown to be resolute in his diligence as a successor. From this sole reminder alone, Katagiri can be seen as strong-willed and tries to not let those who carry a negative impression on him hinder his work. When lost, he becomes rather intuitive and takes the answer that he believes suits best for him or everyone. As eccentric and hardworking as he is though, Haruhi considers himself as just a ‘boy’ who does everything for the Headmaster and carries a lack of self-esteem due to his limitations from his anxiety and goes as far as to doubt himself heavily. However, his inner voice would occasionally (and dully) chime in, and lecture him to focus on his goal of becoming a worthy successor.

This voice would have a meek tone and a very soft mannered way of speaking, rather timid.