Fujiwara-no-Sai (藤原佐為) - A spirit from the Heian era of Japan and mentor of Hikaru Shindo. Once the Go instructor to the Emperor, Sai continually plays Go, his goal being to one day play the divine move (also known as the Hand of God or Kami No Itte). In the manga and anime, Sai's ghost had possessed the real-life figure Honinbo Shusaku who became a renowned Go player. Sai holds a rivalry towards Kouyou Touya (a.k.a. Toya Meijin) and through Hikaru persuades Toya to have a game with him. His wish is realized when Touya accepts the challenge and plays a game through the Internet. After the legendary match that ends with Sai's triumph, Hikaru discovers another move which would have turned the game around. Witnessing Hikaru's maturity, Sai comes to feel that his one-thousand-year time in the world is going to end without his fulfilling his wish of obtaining the divine move; but he reasons that perhaps he was fated to awaken and teach Hikaru, who might obtain it in the future. A few days after the game with Toya Meijin, Sai suddenly disappears as he feared he would. Hikaru was dozing during their last game, so he could neither terminate his last match with Hikaru nor say goodbye to him. Sai is gone, leaving Hikaru depressed and wanting to quit the game. When Hikaru plays Isumi, Hikaru realizes that he will continue to play Go, for Sai lives on in Hikaru's Go. Extremely effeminate by today's standards (as is appropriate for a high-born Heian man), Sai is often drawn with traditionally feminine features and mannerisms. Yumi Hotta has joked about fans mistakenly calling him a "she" in the "intermission" pages of the manga. Sai's extremely emotional behavior is also proper for a Heian male; he sometimes cries copiously in chibi style (usually in an episode introduction), soaking his long sleeves with tears, which in his own time would be respected as a sign of intelligence and sensitivity. His name Fujiwara suggests that he is related to a noble family of extremely high prestige in the Heian period, the Fujiwara clan. Sai has a high sense of honour, abhorring cheating and bullying. He is voiced by Susumu Chiba.