Shizuo's younger brother and a gifted actor who performs under the stage name Hanejira Yuuhei. He's been turning heads since his amateur days with what people describe as genuinely unbelievable talent. Off-camera though, he's almost eerily composed—rarely speaks unless he has to, completely flat emotionally. He's admitted this comes from growing up around Shizuo, whose emotional control is basically nonexistent, so Kasuka learned to go the opposite direction.
His hobbies span everything you can imagine: basically all sports, fishing, billiards, darts, horse riding, collecting cars, theater and movies, painting, calligraphy, woodworking, magic tricks, aikido, piloting small planes, flower arrangement—the guy's genuinely well-rounded. He's got a cat he's genuinely attached to (Yuigadokusonmaru), likes homemade curry rice, pudding, and dairy in general. Gum's his thing to avoid though, since he genuinely doesn't know when you're supposed to stop chewing it. He also doesn't vibe with people who judge others purely on gossip.
One of his favorite quotes is from Edgar Allan Poe: "With me poetry has not been a purpose, but a passion."
Worth noting: Izaya's twin sisters, Kururi and Mairu, are fans of his.
Content compiled by AnimeList.moe from publicly available sources.
