Yamato is an extremely bright and cheerful young man, who usually means well. He enjoys building relationships, even with the most unsociable students. Yamato has the talent of Ultimate Inventor, following his father's footsteps, who was the former Ultimate Inventor. He is known for being a highly gifted individual, having a knack for chess and computers. Despite his intellect, he has a shortage of emotional intelligence. Yamato is the heir to the distinguished Kisaragi Foundation. He is 19.