Iruka

Iruka Umino is a character in the anime Naruto, a teacher at the ninja academy.
Appearance: A man of average height and build, with black hair (brown in the anime) tied in a ponytail, dark eyes, and a scar that runs across the bridge of his nose, which he received in his youth. He wears the standard Konoha shinobi outfit, complete with a forehead protector, sandals, and a flak jacket.
Personality: Iruka is a very skilled chunin who can be both strict and considerate towards his students. He has a friendly relationship with Naruto because they were both orphans as children and acted like hooligans to get attention from others.
A sense of duty, honor, and selflessness: This was most clearly shown when he protected Naruto from Mizuki's attack, only to be injured in the back by a shuriken.
He loves to tell his students the history of Konoha and teach them the basic duties of a ninja - to protect their loved ones at any cost and never back down from difficulties.