Ma-kun features as a recurring minor presence in arcades across the series, invariably accompanied by his girlfriend Raging Girl. Both characters display pronounced tendencies to erupt into visible frustration and throw tantrums following competitive losses in versus matches.

He possesses brown hair and black eyes, aging from 13 during the initial story segment (Part 1) to 14 in the subsequent segment (Part 2). During gameplay, he consistently adopts Nakoruru Ken as his character avatar.

A notable visual trait shows Ma-kun sharing sprite imagery similarities with protagonist Haruo Yaguchi, maintained even during conflict sequences between them. His narrative purpose centers on embodying a distinct competitive arcade gamer dynamic through interactions with Raging Girl and volatile reactions to defeats.