Nerugui

Nerugui is a male ferret appearing in Naruto the Movie 2: Legend of the Stone of Gelel.

Background
Nerugui is a longtime companion of Kahiko and his clan. He apparently does not take to people unless they are from the clan being especially connected to the royal bloodline.

Plot overview
He was first seen when Naruto, Sakura and Shikamaru were on a mission of finding him. They have a hard time capturing him and bringing him back to Kahiko due to Naruto's ignorance and when they are attacked by Haido's knights, including Temujin. After Naruto and Temujin fall off a cliff during their fight, Nerugui is returned to Kahiko and his clan but decides to stick around with Temujin more than Kahiko.

The reason he has lived so long is that he has a small piece of the Stone of Gelel in his mouth. He attacks Haido but is struck down. He later leaves with Temujin to the new land.