Shimon Hijiri

is an "elite chūnin" from Konohagakure that serves as a member of the Konoha Intelligence and Interrogation Unit alongside Ibiki Morino and Inoichi Yamanaka.

Chūnin Exam Arc
He is a proctor for the written portion of the Chūnin Exams.

Trap Master Arc
Shimon was later sent by Tsunade along with many other chūnin to investigate a possible attack on Konoha. It was later revealed that the whole incident had been set up by Gennō.

Invasion of Pain Arc
He, Mozuku, and Tonbo Tobitake assist Inoichi Yamanaka in reading the mind of Yūdachi. When the invasion of Pain starts, they help distract the Animal Path to give Inoichi a chance to analyse what he has learned.

Trivia

 * His eyes are obstructed by his bangs in the manga. In his anime début however they were visible; though in recent appearances his eyes are obstructed as in the manga.
 * Shimon briefly appeared in episode 21 in a meeting prior to his début along with Mozuku and Tonbo even though they were not present in the previous episode.