Koyasu Shinsui is the Ultimate Composer, and acts in a very gentlemanly and polite way, claiming it's proper to do so because that's the way his parents taught him. His voice is noticeably melodic, as if he's almost on the verge of singing whenever he speaks. He values himself on how creative he can be with his music, and is extremely dedicated when it comes to composing, sometimes going entire nights without sleep. For a long time, he had worked under the alias of K. Tokai, making his music grow in infamy as people tried to discover who the composer could possibly be. His alias became known worldwide for their phenomenal scores, and he eventually decided to put the mystery to rest, coming out as the person behind the name shortly after being scouted to Hope’s Peak.
Koyasu's voice is an interesting one, as he's very melodic even with his normal speaking voice. I won't be making characters sing, but if anyone could, it's him. He's meant to be as polite and charming as possible, and because of this, he should come off as a true gentleman.