Daima Jin, nicknamed Ebisu no Jin, belongs to the Kimengumi group. His family runs a food business portrayed alternately as a cake shop, bakery, or okonomiyaki restaurant in various adaptations. A habitual class sleeper with a bottomless appetite, he transforms into a fiercely protective figure when his food is threatened.

Blessed with remarkable luck and a talent for mimicry—notably impersonating singer Yoshinori Monta—he navigated high school entrance exams in two attempts, outperforming several peers academically. Shusse Kiyoshi, his closest ally in the group, shares an unshakable bond with him.

Regional versions, like the French dub, adapt his name to Jim. While spin-offs and official media maintain his core personality, documented sources do not elaborate on further backstory or evolution beyond these established traits.