Sentoki

is one of the monks-in-training at the Fire Temple. When the Akatsuki members Kakuzu and Hidan attacked the temple, he was away. He returned immediately after, finding the temple in ruins and the Akatsuki members as they were just about to leave. Sentoki subsequently went to Konoha to notify them of the attack and request help.

He is one of only three known survivors of the attack on the Fire Temple.

Trivia

 * Sentoki's name means "a thousand hours" or "a thousand times".