Kenji is Rin's younger brother. He seems to be a bit careless, which is, according to his grandmother's words, is affected by his mother's early death. On the whole, Kenji acts like a typical boy of his age.
Kenji is a fan of video games and knows a lot about RideBacks. In fact, he was the person who gave advice to Rin when she was preparing for the competition with Tamayo Kataoka. However, he hates to tidy his room and is too lazy to do it.
Being curious and eager to look cool, Kenji got involved into BMA.