Renko is a very serious boy, to the point he becomes annoying. He take studies and work way too seriously, and hardly never get some time for himself. He seems contemptuous and is a real moaner: everything you do might be the chance to criticize you for him, and especially if you are too different from him. Renko is not very open minded. He's mostly an introvert and spends most of his time alone. Despite all of this, he's actually caring and not so mean if you get to know him.