At a young age Tasuki found his calling as a bandit when Hakurō, the chief bandit of Mount Reikaku, took him under his wing. He began to improve his martial arts abilities in hopes of living up to and carrying on the role of his mentor. He and fellow bandit Kōji eventually master the use of an iron fan in combat. Tasuki first meets Miaka when he kidnaps her in order to regain his rightful place as the leader of Mount Reikaku's bandits. He eventually joins her in order to help the other Celestial Warriors on their quest, reluctantly leaving Kōji as the leader of the bandits of Mount Reikaku.
Straight-forward, simple-minded, and quick to pick a fight, Tasuki also has a strong sense of honor. Though he appears utterly blunt, vulgar, and loud, he is sentimental and easily becomes emotional. He provides a frequent source of comic relief in the series: he enjoys joking around. Tasuki values his friends greatly and will not hesitate to kill those who would try to endanger them or make fun of them in any way. Despite being rough around the edges, Tasuki shares a particularly strong relationship with Chiriko. Tasuki, as the youngest child and only son of a family with five older sisters, an aggressive mother, and timid father, happily accepts the role of an older brother figure to Chiriko, who looks up to him and strives to become a "manly man" like Tasuki. Of all the Suzaku Celestial Warriors, he takes the deaths of his comrades the hardest and openly cries for them. A running joke in the series is that Tasuki is afraid to swim, claiming that it is because he is a "man of the mountains", though on several occasions he is able to instinctively tread water and finds unusual means of compensating for his weakness.
As the youngest and only son in a family with strong females and a weak father, Tasuki claims to hate women. His feelings toward Miaka are apparently brotherly.
At the end of the series, he and Chichiri remain the only living Suzaku Celestial Warriors in "The Universe of the Four Gods".