One character would be A Guo who looks like Sasuke Uchiha from the Naruto series only A Guo has blue hair with the same hair style that Sasuke Uchiha has.
Feeling that his outstanding abilities, that caused others to call him a "genius", are more special than theirs, he is initially unwilling to cooperate with Sakura Haruno and Naruto Uzumaki, but later starts seeing them as useful.
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While he was initially cold and singularly driven by his revenge, he becomes more empathetic through his relationships with other characters, notably Naruto Uzumaki, whom he comes to consider as a rival.
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After speaking with his editor about the future of the series, he was advised to create a rival character for the series' protagonist, Naruto Uzumaki, resulting in Sasuke's creation.
Kakashi Hatake is introduced as the leader in charge of Team 7, a new ninja team team including Naruto Uzumaki, Sasuke Uchiha and Sakura Haruno.
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In the story, Kakashi is the leader and teacher of Team 7, consisting of the series' primary characters, Sasuke Uchiha, Sakura Haruno, and Naruto Uzumaki.