He has a competitive personality when it comes to sports and specially when he's trying to win Serinuma over. She has described him as kind and good-humored. But when he gets alone with Nanashima and Kae, he becomes a kind, affective and smiley person. Igarashi had shown to be jealous whenever there is a romantic scene with Kae and one of his rivals. He isn't fond of the idea when Kae is alone with someone else other than him. Due to Nishina's statement of how he only love Kae for her looks which is why he started to develop feelings toward her, Igarashi disagreed with that statement. However, he began to question his feelings toward Kae more especially after Kae became large again after the Valentine's Day arc. His feelings for Kae were put to the test and wondered more about his attraction to her. However, after spending time with her on the roof, Igarashi realized that regardless of Kae's appearance, Kae is still the same kind hearted beautiful person he fell in love with. This causes him to accept her large physique and fall in love with her once again. People think of him as a kind yet tricky guy, having two "sides".

Please refer to the provided clips for the audition.