Shoto's personality can be downright spiteful at times, and this ties into his tendency to hold grudges and act in an arrogant manner. ...I'm pretty sure he has a rare genetic condition at birth called heterochromia. Todoroki's eyes are different colors that are around the iris of the eye. It doesn't affect eyesight whatsoever and it doesn't just affect the color of the eyes but also hair, he inherited both his mother and father's hair color.