Igajima Senichi (伊賀島 仙一) is the coach of Sengoku Igajima.
Igajima has grey hair, a beard and a mustache and also has a scar over his right eye. He wears a dark brown head band, red vest, white shirt and a dark blue tie.
Igajima has lot of faith with his team, since he has trained them to use secret ninja skills. He also seems to be a very restful person.
- He is said to be a descendant of ninjas.
- He has the same name as his team, Sengoku Igajima.