A member of the six knights and the captain of Saint Ishiyama's boxing club.
He is the Union Boxing Club captain who has ended every match in one blow. Not much is revealed about his past.
Ichiro Shinjo, who is created by Ryohei Tamura, has no information regarding any inspiration used to create him. He first appears in Beelzebub volume 6 and episode 29. His Japanese voice actor is Daisuke Hirakawa.
Ichiro Shinjo has amazing strength and speed, and as a boxing champion, he ends his matches with one blow.