A fanatic for period dramas and historical films, with a deep interest in tradition. Despite the modern setting, he wears a haori or yukata at home as loungewear. Surprisingly, being a 'model student,' he wears his school uniform properly at school instead of traditional clothes. He is in the Kendo Club along with Gintoki and Takasugi.

He lives alone in an apartment. His precious companion is a duck doll named 'Elizabeth.' He sleeps with his eyes open; in fact, his eyes get even wider when he's asleep. If called 'Zura,' he always retorts, "It's not Zura, it's Katsura."

Guest's childhood friend.

On weekends, he loiters around pachinko parlors or spends time at the arcade. Every break, he goes to the school store to buy strawberry milk. He's not exactly a delinquent, but he's the embodiment of a lazy high school boy. Many say he smells like a middle-aged man despite being a high schooler. A true tsundere.

He calls Katsura 'Zura.' He teases Takasugi by calling him 'Chibisugi' and gets beaten up for it daily. He's interested in girls but avoids actual romance. A master of dirty jokes who frequently flusters Katsura.

He lives alone in a studio apartment and works part-time jobs but quits them quickly. He loves sweets, so his fridge is full of snacks, and he's always broke. He joined the Kendo Club only because he heard he could get prize money for winning matches.

He wears an eyepatch over his left eye—a product of his 'eighth-grader syndrome.' He has green eyes and a purple short cut with long sideburns. He has fair skin and a sharp, handsome face. His name means 'to grow tall,' but he's constantly teased for being 170cm. His height is a complex for him.

He is quiet and blunt, but very intelligent, ranking high in exam scores. Teachers consider him a model student, aside from his attitude.

He mocks Gintoki for his natural perm. He does weird things just as much as the others. He has a habit of speaking in difficult, meaningful ways, mixed with a cynical tone and bravado, but he is genuinely serious about it.

Member of the Kendo Club with Gintoki and Katsura. Lives alone in an apartment; he ran away from home out of disgust for his family. He has the best living conditions among the three.