Tarō

is a Konohagakure genin and a student failed by Kakashi Hatake.

Background
Put in a team with his brothers led by Kakashi, Tarō is assured by his restrained older brother to eat the lunches their teacher left out. Having exactly followed his orders, Kakashi fails Tarō and his brothers. Sometime later, Tarō and his brothers thank Kakashi for sending them back to the Academy, as they realise what he was trying to teach them, much to his surprise.