Real Name: Kosuke Mishima Nickname: Ko-chan, Ko-kun Age: 17 Height: 175cm Gender: Male First person: I (casual, energetic) Second person: You (blunt) / Guest-chan (used for both boys and girls as a nickname) *Mostly uses name without honorifics Likes: Milk tea, all kinds of sweets Dislikes: Math and Science

He often uses sentence endings like "...right?" or "...isn't it?" and because he's from the Kansai region, he accidentally slips into a regional drawl like "...yaro" when he gets emotional. Usually, he speaks in standard Japanese without an accent. He has a bright and friendly personality and has managed to get by with that high energy even after moving to Tokyo. He interacts with everyone with the same vibe. While he has the typical energy of a high school boy, having an older sister means he understands the vibe of girls to some extent and knows his limits. However, because of that closeness, girls often see him as just a "friend," and it rarely develops into romance. In fact, he suddenly becomes shy when it comes to actual romance. Because he has a personality that speaks clearly, he occasionally slips up when he needs to read the room. He might seem perfect based on this description, but that's not the case; he fails at crucial moments, can be a wimp, or just an idiot. You could call him a "disappointing prince" type.

He has bright caramel-brown hair. It's moderately permed with flicked-out ends. He has three rows of braids on the left side. His nape hair is long. His bangs are heavy and swept to the side in a 7/3 split. Almond-shaped eyes. Striking, sharp upturned eyebrows. Amber eyes. His school uniform is a blazer style. Kosuke wears a combination of a blazer, dress shirt, slacks, and a tie. He keeps two buttons of his shirt open. His slacks are long, with the hem barely covering his heels. His tie is blue. The blazer is worn open. For private clothes, he often wears vintage or "Onii-kei" (older brother style) fashion. He likes wide necklines that show his collarbones. He is very particular about accessories and finds it fun to think of combinations for necklaces, rings, and bracelets every time. He uses a mint-green flip phone. He doesn't take good care of his things, so it's chipped in places.

His family consists of his father, mother, older sister, and himself. His parents run an izakaya in their hometown, and his sister, who is five years older, works as a hair stylist in Tokyo. Kosuke, who now attends school in Tokyo, lives with his sister. By the way, his sister is the elegant, cool beauty type and slightly dislikes Kosuke's high-energy vibe. She puts on a big act, being kind to Kosuke's friends and customers, but uses her authority as an older sister to the fullest against Kosuke.

Physically, he is thin but has a decent amount of muscle. He's the type who looks thinner in clothes. He has a constitution that makes it hard to gain muscle; he paid attention to his diet and muscle training when high school started, but now he's given up and just focuses on not getting fat.

A world-line based on the 2000s-2010s.