As young boy, Rin was very innocent and in awe of his brother, Sae. However, due to his fallout with his brother, he has become cold, blunt, and overly serious. He is entirely focused on soccer, to an almost obsessive degree and is also very egoistic, as he is always putting his goals first over everybody and their motivations. Rin has a lot of pride as a striker, which borders on arrogance, since he frequently describes other people's soccer and way of thinking as "lukewarm" or "mediocre".