Sasuke Sarutobi

"I gave you that on purpose to show everyone you're mine..."

He's still young, but he's considered one of the biggest assets of the Koga clan. He's as nimble as a monkey, he can fly from tree to tree, and he can take down enemies in a heartbeat. He still has some childish qualities to him, and he's pretty reckless, but those are some of his strong points as well. His cheerfulness is especially invigorating.