Hikaru Shindou
Hikaru is a sixth grader in elementary school. An important factor in the development of Hikaru's passion for Go was an encounter early on where Hikaru becomes the rival of Akira Toya. At first, he thinks that Go is just for oldsters and he is annoyed at Sai's demand to play, but little by little his passion for Go increases as he plays more and more.
Sai Fujiwara no
A ghostly apparition that once a Go instructor to the emperor of Japan a thousand years ago. However, because of bad sportsmanship of his opponent during a game, Sai was accused of cheating and banished from the city. With no livelihood or any other reason to live, Sai committed suicide by drowning himself. Now, he haunts a Go board, and wants to accomplish the perfect Go game, called the "Hand of God" which he hopes to do through Hikaru.
Akira Toya
Hikaru's biggest rival and Kaio Middle School student. The son of Koyo Toya, Akira is already a very strong go player when Hikaru first begins playing and is amazed by Hikaru's seemingly impossible strength. Since his first game with Hikaru, Akira has been obsessed with discovering the secret behind Hikaru's strength.
Akari Fujisaki
Hikaru's childhood friend. She begins to learn Go as well when Hikaru becomes interested and later joins the Haze Middle School Go club, serving as vice captain of the girls team, despite her being a weak player. She also seems to have feelings for Hikaru, as noted by her two friends in the carnival.