Sai Yamanaka (山中サイ, Yamanaka Sai) is the Anbu Chief of Konohagakure's Yamanaka clan. Prior to this, he was a Root member. As per standard Root training, Sai was conditioned to remove all emotions and as such, had difficulty connecting with others.Sai grew up in training with Root, which was a very specific subsect of the Anbu, a ninja team that specializes in bringing in rogue ninja, usually by killing them. Root in particular trained its ninjas to not feel any emotions and to take orders.