Hibiki Mizushima is the quiet yet hostile Ultimate Classical Musician. Hibiki has a quiet demeanor that appears to be a result of his shyness on the surface, but is actually a result of his refusal to get along with other people. He's very sensitive about his talent, and will immediately soften up if it is complemented; especially if an attractive man is doing the complimenting. However, the moment his talent is insulted, he becomes hostile, insulting people with his sharp tongue and quick wit. Hibiki seems to find humor in insulting others, often snickering at his own jabs.

As the Ultimate Classical Musician, Hibiki is a master of all traditional classical instruments. His parents required him to pick up the piano when he was only three years old, and it only spiraled from there. Because of all the work he put into perfecting his talent, Hibiki is very protective of his ability.

Hibiki has a medium-high voice. His voice sounds as if he has a distant or cold personality, with a bit of hostility and bite to it. However, he can certainly sound almost cute at times. If I had to compare his voice to a canon Danganronpa character, it would be closest to a more hostile and cold Makoto Naegi, but I'd recommend not getting too hooked up on that.