Keltu is a 19-year-old tall boy, very greedy, a thief, a liar, and a senior bully in Nonte and Fonte's class. He's the only student who wears trousers instead of shorts probably on account of his advanced years. In one comic strip, the reader learns that he has failed the class six times and the governing body of the school wants to get rid of him. He is shown variously as having curly hair and a stubby nose and being a bit taller and stronger than Nonte and Fonte. Often he threatens and coaxes them into doing work for him but invariably gets busted. He also rats on the other students to curry favor with the superintendent and is, in general, quite boastful.