Iruka Umino (うみのイルカ, Umino Iruka) is a chūnin of Konohagakure, who served primarily as an instructor at the Academy until being promoted to Headmaster years later.

Iruka is a man of average height and build. He has black hair (brown in the anime) that he keeps in a ponytail, dark eyes and a scar that runs across the bridge of his nose — which he has had since his youth. He wears the standard Konoha shinobi outfit complete with forehead protector, sandals, and flak jacket. His sleeves are also rolled up about ¼ way. As a child he wore a simple outfit along with mesh-armour underneath it.

In The Last: Naruto the Movie, two years after the Fourth Shinobi World War, Iruka's overall appearance stayed the same. The only noticeable difference is he wears an Uzumaki clan logo armband on his left arm with the new standard flak jacket and high-top sandals. Several years afterwards, Iruka has aged further, with slight creases around his mouth. He also abandons his forehead protector and shinobi attire, and instead dons a grey zipped shirt.