Sasuke Uchiha
Kakashi Hatake is introduced as the Jonin (elite ninja) leader in charge of Team 7, a new ninja team including Naruto Uzumaki, Sasuke Uchiha and Sakura Haruno. He first appears as a carefree character and tends to lose track of time, being frequently late to his appointments as a result. However, when testing his students, Kakashi reveals himself as a strong opponent to the point of fighting while reading series of erotic novels. Kakashi is renowned throughout the "Naruto" world for the use of his Sharingan, which he received from his teammate Obito Uchiha, and is revered as the ninja who has copied over a thousand jutsus, earning him the moniker . The Sharingan grants him the ability to mimic the movements and jutsu of others. Although most of Kakashi's abilities were acquired with his Sharingan, he also invented the and its variation, a collection of lightning chakra in one's hand that uses the Sharingan's visual ability to lock onto a target. When first forming Team 7, Kakashi does not take them as his students until instilling in them the concept of teamwork even if they have to break the rules he gave them. Kakashi continues to further this philosophy for the duration of Part I upon Sasuke Uchiha but is unable to get through to him before the latter's defection from Konoha. Kakashi also reluctantly participates in various challenges by his childhood friend Might Guy who considers Kakashi his rival.