Mitoku

He is the current head of the Konoha Cryptanalysis Squad who oversees the day-to-day activities of the squad, taking direct orders from the Hokage.

Personality
He is somewhat lackadaisical and is not used to staying up late in the office, as implied by Shikamaru Nara when he was tasked by the Fifth Hokage to deliver Jiraiya's code and his desire to go home immediately after an overnight duty.

Invasion of Pain Arc
He is usually seen working in front of the squad's office computer, and is knowledgeable of all the secret codes Konohagakure uses in the delivery of messages. This explains why he found it unusual that Jiraiya's encrypted message did not correspond to any code in their present holdings when Shiho and Shikaku Nara brought it to him. He then stated that given the circumstances that Jiraiya left the message under that it could not be anything very complex. He then tells them to think of a person that he intended to leave the message for as they would be the best bet for decoding the message.