Ryōga was the leader of Kōga Clan's ganin.
He shares a close resemblance to Tesshin except without the black markings under his eyes.
He is impatient but not as much as his son, but he does care about his son.
Throughout several battles, Ryōga has ordered his son to stand down and back off due to his attitude. In a battle with Ōzaru, Ryōga has his ear torn off by the Iga leader and the two fight to the death. Whilst Ryōga manages to slash Ōzaru with his sword, he is stabbed in the chest by the Iga Ganin and both collapse. Both Ryōga and Ōzaru die from their wounds.