Bars Robin is a teacher employed at the Babyls Demon School and teaches the class on familiars, he has bright green hair and yellow eyes, short-statured compared to the standard adult demon. He dresses in clothing that is various shades of green.

Robin is extremely childish. He came up with a nickname for Kalego. Although he is strong enough to make Kalego respect his strength. Robin annoys Kalego, thus getting hurt by his senior nearly all the time. Robin is encouraging as well. Despite his extremely childish personality, Robin, like the other teachers, is extremely capable in their own right, as shown when he became the special instructor for Shax Lied and during the Heartbreaker. He was more serious regarding his students, as he showed when he hit Ocho from afar.