|Kanji:||馬場 進司（ばば しんじ）|
|Manga Debut:||Chapter 4|
Baba is a chubby man, with slicked back hair.
Shinji was first seen in the dumps of a back alley, where he was beaten by some men. After Tokorozawa told him about Riku, he quickly tried to scare Riku and make him drop the idea of being a boxer, but ended up liking Riku's abilities and motivation and decided to train him.