Due to a lack of information, there is not much known about Unmo Samidare as he never appeared as a person in the anime. He appeared in a bingo book that belonged to Sai. When Yamato, Naruto Uzumaki, Sakura, and Sai found out about the hideout of Orochimaru and Sasuke Uchiha, they went there to search, but Sai already went ahead of them so that he could kill Sasuke Uchiha since Danzo Shimura gave him the order.

Sai used to work for Root, which was led by Danzo and it was created to do all the dirty work of Konohagakure. When Yamato saw the bingo book of Sai, he was able to understand the mission of Sai as there was a picture of Unmo Samidare with a cross on his face, which shows that the person was assassinated. Yamoto knew a bit about him, as he was one of the top jonin rank shinobi of Kirigakure who might be planning to attack Konoha village.

Unmo Samidare has a hatred towards Konoha village and he was a threat to them which is why he was in the bingo book.

He is dressed in the usual shinobi outfit of Kirigakure, including the flak jacket and forehead protector that was worn as a bandana. He had round brown eyes.

Unmo Samidare was a jonin rank shinobi from Kirigakure, which makes him one of the most skilled and talented shinobi. He was in Root's bingo book, meaning he must be a danger to Konoha village.

Q. Unmo Samidare was from which village?

A. Unmo Samidare was from Kirigakure (The Village Hidden in the Mist).

Q. Unmo Samidare was killed by whom?

A. It is said that Sai assassinated Unmo Samidare.