Unmo Samidare

was a jōnin-level shinobi from Kirigakure.

Background
Unmo was known for his animosity against Konohagakure, and therefore, Root deemed him a potential threat to the village. As such, Sai was dispatched to assassinate Unmo.

Personality
Unmo was known for his strong feelings against Konohagakure.

Appearance
Unmo was a man with round eyes and dark marking around his eyes (in the anime, they were more like wide, snake-like eyes). He wears the standard attire of the Kirigakure shinobi inclusive of the village's standard flak jacket and forehead protector which he wore like a bandanna.

Abilities
Although his abilities remain unknown, Yamato claimed that Unmo wasn't one to be defeated easily.

Trivia

 * Unmo was introduced in Sai's Bingo Book when Yamato was looking at his belongings, with his name on the top-left corner of the page. In the manga, the name was unclear, but was shown in the anime.
 * means "early summer rain".