Umeji has short, unkept, dirty blonde hair and yellow eyes. He has a singular long scar trailing down his right eye and several piercings on his left ear. His uniform top is unbuttoned, revealing a bright yellow t-shirt with an image of a skull on fire. He carries a weapon bag, which contains his baseball bat. Like most of his fellow delinquents, he is often described as being "violent" and "rude." He is easily angered and is always ready for a fight. He despises anyone who isn't in his gang.