What does a senpai call his student?

kōhai
Senpai refers to the member of higher experience, hierarchy, level, or age in the organization who offers assistance, friendship, and counsel to a new or inexperienced member, known as the kōhai, who must demonstrate gratitude, respect, and occasionally personal loyalty.

Who studies under a sensei?

While ‘seito’ generally refers to anyone who studies under a sensei, ‘gakusei’ refers specifically to people who study at at a school—the ‘gaku’ (学) in ‘gakusei’ (学生) is the same kanji used in ‘gakkou’ (学校), or school.

What is a student to a sensei?

You can refer to yourself using the humble term “kyoshi” which means a teacher. Your students, or “deshi” (I believe “deshi” translates as pupil) would then refer to you as sensei.

What is a student called in karate?

KOHAI (ko-hai): A student junior to oneself.