Originally a top player from abroad, Tokugawa is a member of the first court who had previously been humiliated in a match against Byoudouin. After that loss, he trained on the mountain and was helped by both Oni and Irie in order to get revenge against Byoudouin. His glare is apparently capable of dealing temporary Yips in the same manner as Yukimura's tennis. His tennis somehow incorporates the Divine Path of Asura, allowing him to increase the speed of his shots or make them bounce unpredictably. He also has a double-edge sword technique known as the Black Hole, which allows him to literally create a small rip in space-time to stop the ball, which from then he can almost always return a winning shot. Strangely, this power seems only seems to stop the momentum of an incoming shot and doesn't negate any pre-existing spin. Tokugawa can keep up this technique for only a half-hour at most, as any further use would make him cough up blood among other medical complications. Tokugawa also naturally possesses some level of clairvoyance, allowing him to "sense" (rather than predict) where and how his opponents will hit to next without the use of data, referred to as premonition. This ability would later evolve even further into the Sixth Sense after he plays doubles with Yukimura, allowing both of them to see into the future with complete accuracy on their opponent's next move. Although focused, he's a very polite person, and concerned for the welfare of others. He insists that he plays honorably regardless of how much of a disadvantage that would put him at, much to Byoudouin's chagrin. He later takes Ryoga's place on the first string after the latter drops out to return to America with Ryoma.