Umeji 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, most commonly authority figures, and yells at them from just being in his point of view. He doesn't think much of school, and would intentionally come to school late. Osoro Shidesu, the leader of the delinquent gang, is absent from school. This student is Osoro's right hand man, and has been trusted.