Kai is a tall, large young man with short hair swept over his left eye.  

Initially, the color of his hair was brown, but this seemed to have changed recently to an ash-blond color. Like the rest of his family, he has blue eyes. He has broad shoulders and is the strongest of his siblings. His naturally sharp eyes make him seem like he's always glaring even though he's not. Anime: His hair was a whiter platinum blond
Despite his frightful appearance, Kai is the most kindhearted of his siblings. 