My Hero Academia

Sekijiro is a tall, muscular man with short pale gray hair, small, thin eyes, and a wide mouth. His hero costume is a dark red suit with a low U-shaped collar, black Y-shaped trim, white boots, vambraces, and red gloves. He wears a three-piece metallic belt around his waist and an orange mask over his eyes. His appearance is characterized by his muscular build, light tanned skin, and a thin wire.

Sekijiro, despite appearing strict, is a caring teacher who values his students' growth and safety. He often uses Class 1-A as a rival but also motivates his own class. Sekijiro is aware of All Might's true form and regrets not doing more for it. He cares for fellow teachers and is quick to react when danger strikes. He has a good relationship with Hound Dog and has been friends for a long time.

Sekijiro and Class 1-B attend a training camp and are instructed to extend their Quirks to gain attention. They learn that Quirks grow stronger over time and join Class 1-A. Three days later, Shota Aizawa visits the facility and finds Sekijiro teaching Neito Monoma. They are contacted by Mandalay, who plans to kidnap Katsuki Bakugo. Shota orders Sekijiro to protect the students, and some escape. Mandalay grants permission for students to use their Quirks to defend themselves, but only the woods students can fight.