Sai (サイ, Sai) is an ANBU-level shinobi of Konohagakure and is from the disbanded faction: Root. He later became one of the main supporting characters of the series, and is a member of Team Kakashi, having replaced Sasuke Uchiha.
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"A smile is the best way to deal with difficult situations. Even if it’s a fake one. Used properly, you can fool anyone with them. The New Team Kakashi Sets Out – Naruto: Shippūden