Urushi (summon)

is a ninken and a personal summon of Kakashi Hatake.

Appearance
Urushi has white and light-brown fur, along with long spiky tufts of hair on his head. His eyes greatly resemble traditional Japanese angry eyes. Being one of Kakashi's ninken, he wears the standard blue vest with the heno-heno-moheji seal and a Konoha forehead protector around his neck.

Land of Waves Arc
Kakashi called on Urushi and the ninken pack to track and capture the missing-nin Zabuza Momochi. They managed to bite onto the missing-nin and pin him in place. This allowed Kakashi to use Lightning Cutter without fear of a counter attack.

Sasuke Retrieval Arc
Later, Urushi and his fellow ninken were summoned by Kakashi to track down Naruto Uzumaki and his team who had gone off in pursuit of Sasuke Uchiha.

Ultimate Weapon Arc
He along with the other ninken were summoned by Kakashi to investigate the Takumi Village.

Kazekage Rescue Arc
At the start of Part II, Urushi and the ninken pack were called upon to track down the Akatsuki member Sasori using a small piece of his clothing.

Itachi Pursuit Arc
Some weeks later, Kakashi summoned the pack to help track down Itachi Uchiha. He and Ūhei were partnered with Sai.

Five Kage Summit Arc
In the anime, Urushi was seen along with Akino, Shiba, Bisuke and Ūhei being deployed by Kakashi each carrying scrolls with intel for the other hidden villages.

Trivia

 * Urushi's fur was initially depicted as being white. It was later changed to light-brown, though in the manga, it has a more blond colour.