Ōka highly resembles his youngest son Recca. Like his son, he possesses spiky black hair, although Oka's hair is kept in a long ponytail, with a mess of hair handing over his forehead. His facial features were older, and more mature than that of Recca's, possessing an unshaven face, as well as including a long scar going down his right eye. In battle, he wears a traditional Hokage ninja uniform. He also carries a ninja sword. In the final episode of the anime, Ōka's image is briefly seen as his dragon spirit form, Resshin which Kagero recognizes him from its distinctive hair and appearance.