Birthday: November 11, 1992 (manga), 1994 (anime)

Gender: Male

Blood Type: AB

Age 16 (chapters 1-86), 17 (chapters 87-present)

Height: 170 cm

Weight: 56 kg

School: Kaimei High School

Class: 2-F (chapters 1-209), 3-C (chapters 210-present)

Likes: Illustrated encyclopedias, making designed t-shirts

Dislikes: Those who cause disorder

Affiliation: Student Council

He is the former vice-president and current president of Kaimei High School's Student Council. He is generally referred to by his last name, Tsubaki, only.

He has a strict personality when it comes to people abiding to the rules. He is also strong when fighting especially in close combat, but only displays such brutality when needed. He takes great responsibility for his actions, has a great sense of justice, and is shown to dislike foul play. Though he has a stiff attitude, he is also shown to be very caring especially towards his friends. Like his Bossun, he has inherited the will to help people. This was triggered when somebody saved him from being hassled by upperclassmen. His stiff composure can be interrupted when others teased him and when he competes with Bossun.