Also known as: 佐井, サイ(NARUTO), サイ, 山中サイ
Supporting character appearing in Naruto Shippuuden. He replaced Uchiha Sasuke and is now part of Team 7 with Hatake Kakashi, Uzumaki Naruto, Haruno Sakura and Yamato.
He was trained to show no emotions. His drawings can awake and be used for several purposes, for example in fights or for mobility.
Sai's voice actor is Hino Satoshi.