Kamatari

is the personal summon of Temari.

Appearance
Kamatari is a giant, white-furred weasel with a dark green eye-patch covering his left eye. He carries a large sickle that is almost as long as himself.

Abilities
He was summoned using Temari's Giant Folding Fan as a medium through the Summoning: Quick Beheading Dance, after which he slices down everything in his path with enough force to decimate an entire forest. After he starts moving, he can't be seen by the unaided human eye. He was summoned holding a giant Kama with other smaller sickles around him and something that resembles a Chinese lantern with the kanji for on it. In the manga, Kamatari gave a battle cry before attacking.

Sasuke Recovery Mission
Temari wanting to finish off her battle with Tayuya, a genjutsu specialist, Kamatari was summoned through the Summoning: Quick Beheading Dance. In a split second, Tayuya is quickly finished off, much to Shikamaru Nara's surprise.

Sunagakure Support Mission
Kamatari once again made an appearance in this filler arc, where he is employed as the integral part of Shikamaru's strategy in an effort to bring Kujaku down.

Fourth Shinobi World War: Confrontation
In the anime, during the Fourth Shinobi World War, he was summoned by Temari to stop Chūkaku from freeing the Third Raikage, and later to destroy Torune's insect clone.

Shikamaru Hiden: A Cloud Drifting in Silent Darkness
Temari summons Kamatari to help her fight the Enlightened Ones.

Naruto Shippūden the Movie
Kamatari was summoned by Temari while fighting off the Ghost Army.

Trivia

 * Kamatari is an obvious reference to the Japanese yōkai ; however, instead of being simply a weasel with razor sharp-claws, it is literally a with a.