Kojiro Yuki is the husband of Aki Yuki, the older brother of Akemi Yuki and the father of Brayden, Jaden and Reina Yuki. Kojiro has has the signature brown hair, and light golden-brown eyes.
Due to work, Kojiro wasn't around much during his children's childhood, making his sister look after them. Despite not showing it, Kojiro does care for his family and his excuse for not being around is maintaining enough for the house and family. Kojiro is almost always working, much to Akemi's annoyance.