Toshiro Tsubaki (椿俊郎 Tsubaki Toshirō) - An older go player who applied for the Go test. He plays against and defeats Hikaru during the test. Tsubaki has a large beard and is very loud; Tsubaki easily intimidates Hikaru. Once Hikaru plays more games, Tsubaki no longer intimidates him and the two become friends. Before playing against Yoshitaka Waya, Tsubaki bears 13 wins and 7 losses. After his loss to Waya, due to his age he will no longer eligible for participating in the pro tournament, asks Hikaru to win in his place. He is nicknamed "Gorilla Man" because of his large size and loud voice.