The second of the four Hokuto brothers, Toki is a pacifist who seeks to use Hokuto Shinken as a healing art, Toki's self-made technique of Hokuto Ujo Ken, Hokuto Ujo Ken "North Star Humane Fist") is an art adept at both healing and destroying. When he kills someone with his style, his adversaries actually die while feeling great euphoria and pleasure instead of horrifying pain. According to Ken, Toki had the most elegant style of the four brothers and was favored successor to the Hokuto Shinken style.

Toki, along with Raoh and Kenshiro, is from the Land of Asura, where he has two additional blood siblings named Kaioh and Sayaka. Toki and Raoh are actual blood brothers; Raoh and Toki were orphaned when they were children and adopted by Ryuken, who was seeking a student to train. Originally, Ryuken only trained Raoh, while Toki watched on. When a hunter killed Toki's pet dog Koko, Toki demonstrates his fighting ability by pummeling the hunter relentlessly. Realizing that Toki has learned to fight by merely watching his brother, Ryuken began training Toki as well. At that point, Raoh made Toki promised that if he ever followed the wrong path, Toki will try to stop him.