Damjor made his debut in EP167. Before he was a Yo-kai, he was one a human boy who was afraid of catching the ball. While he carried baseball bats, he was flipped backwards to his death. Nate summoned Ashitagirl to cheer him up.
"Damajor" is a wordplay on the English major and dame ja! (だめじゃ！, "it's no use!", "this is hopeless!")