Sasuke Sarutobi is a member of the Koga Ninja, and head of Sanada's ninja squad. He can manipulate animals.
He is very loyal towards Yukimura , and he has a lot of self respect in being a warrior, and will not forgive anyone who would tarnish Sanada's name. He does not like the Iga Ninjas, more notably Saizo Kirigakure. But in the same time he acknowledges Saizo as a strong ninja and trusts him.
He appears before Saizo and Isanami, and both Saizo and Sasuke start a fight within the forest, here they express their hate for one another. Soon after, Isanami stops them, demanding that she visits someone named Yukimura Sanada. Later, he appears with Yukimura when Saizo and Isanami are attacked by a group of ninja, Yukimura used them both as bait to attract them. Sasuke is seen looking in amazement at Isanami's strange power as Saizo and Isanami argue about him not wanting to go along with her. They force him to stay with her after and he brings breakfast for Saizo the morning after. However, Saizo is encounters a group of Koga ninja, causing him to spill his breakfast everywhere. Sasuke takes Isanami to have breakfast with him, while Saizo stays.