Ichigen

was a young monk-in-training at the Fire Temple.

Abilities
His young age and unfinished training meant that his skills were still immature. He deeply admired Chiriku and aspired to be like him.

Hidan and Kakuzu Arc
It was Ichigen who warned Chiriku of the intruding Akatsuki members Kakuzu and Hidan.

He is presumed to be dead since he isn't identified as one of the three known monk survivors in the temple attack.