Kyo Sohma's father belongs to the Sohma's side.
He's a pushover who would only blame Kyo for the death of his wife. He became deluded by the fact that the Cat must be punished for its deeds, so he desperately wants Kyo to go to the Cat's confinment room for the rest of his life. It's possible that maybe he was abusive to his wife and his behavior resulted in her death. Whatever the true cause of his wife's death may be, he holds Kyo responsible and believes that he should spend the rest of his life locked up.
He looks exactly like his son. While it's not shown whether or not they share the same hair or eye color, they share the same facial features. The manga depicates him with dark hair and dark eyes.
He is the biological father of Kyo Sohma. He always argued with his wife because she loved Kyo very much and was always overprotective of him. She was shunned by members of the Sohma family as well as Kyo. Eventually, the strain of protecting Kyo, being shunned and arguing with her husband was too much for her and she commited suicide by throwing herself in front of an upcoming train. Kyo's father blamed Kyo for her death and abandoned him.
He met up with Kazuma Sohma (Kyo's adoptive father) in volume 9 to discuss the matter of Kyo's confinement after high school. He argued that Kyo should be confined, while Kazuma coldly tells him that he will do anything to keep Kyo from that solitary room.
In volume 22, Kyo confronts his father and tries to reconcile with him, and is violently rejected by the man. His father blamed Kyo for his life being made a misery and his mother for giving birth to him in the first place. He also told Kyo that it was impossible for him to live a normal life after Kyo told him of his plans to live the rest of his life with Tohru. After this confrontation, Kyo tells his father that he'll be back, and throws up afterwards.
It is unknown if he reconciled with his son by the end of the series.
- He does not appear in the anime.