Joe's coach.
Danpei is Joe's serious,cautious and responsible mentor,who gets him started in his boxing career.He is fond of sake, being overly cheerful when drunk.He is also very polite when talking to people that hold higher ranks than himself.
Prior to meeting Joe, it is implied that Danpei used to be a boxer himself.However, after loosing one of his eyes, he gave up on his own boxing career.However, because he couldn't forget the sport, he became a coach.But due to his violent, strict,passionate and even desperate approach in training his boxers(who couldn't take it and abandoned him for better gyms) he became jobless and eventually a homeless alcoholic.
After meeting Joe, he vows to stop being an alcoholic for the sake of making the former champion,only drinking in special ocasions.