Kakashi Hatake (はたけカカシ, Hatake Kakashi) is a shinobi of Konohagakure‘s Hatake clan. After receiving a Sharingan from his team-mate, Obito Uchiha, Kakashi gained recognition as Copy Ninja Kakashi (コピー忍者のカカシ, Kopī Ninja no Kakashi) and Kakashi of the Sharingan (写輪眼のカカシ, Sharingan no Kakashi). His prodigious talent, skill, and Sharingan prowess have made him one of the village’s most capable ninja, and as such, both highly renowned and feared throughout the ninja world. Later made the leader of Team 7, Kakashi used his years of experience to train his students as skilled shinobi in their own rights. In the aftermath of the Fourth Shinobi World War, Kakashi takes up office as the Sixth Hokage (六代目火影, Rokudaime Hokage, Literally meaning: Sixth Fire Shadow).
Kakashi typically has a relaxed and almost bored attitude, not prone to getting too worked up about anything or by anyone. He tries to avoid serious commitments or responsibilities, doing only as little as is necessary and being ever-modest about his skills and capabilities. He is habitually tardy, showing up when it suits him, using excuses that convince nobody, and later leaving for equally poor reasons. Though Kakashi wants others to believe this is how he always acts, he only does so for matters that aren’t of particular importance; Kakashi will always step up for the sake of his friends or Konoha, even if that means showing up on time. His aloof detachment remains intact even on such occasions, however, but this has the benefit of making him more rational than others might be in the same situation.
When he first meets his students on Team 7, Kakashi claims to have many hobbies, none of which he chooses to share at the time. He is known to be an avid fan of the Icha Icha series of novels; he always has one of the books with him and regularly reads it, even while talking to others. Naruto Uzumaki identifies Icha Icha as one of Kakashi’s few weaknesses, which he is able to take advantage of during a bell test by threatening to spoil the ending of the newest book in the series, forcing Kakashi to shut his eyes and ears and thereby leave himself vulnerable. Although most people he knows are aware of how much he likes Icha Icha, Kakashi is seemingly uncomfortable sharing the books with others, growing embarrassed by the presumably adult content when he is forced to read passages aloud.
In truth, Kakashi is alone for most of his spare time, spending hours visiting Rin Nohara‘s grave or the Memorial Stone where Obito Uchiha‘s name is engraved. He tells them about his life, recent events in Konoha, and others they knew, but mostly he shares his regrets that they cannot be with him or that their deaths were his fault. In the anime, after Rin died, Kakashi went through a period of post-traumatic stress disorder, having nightmares about her death and growing depressed whenever others mentioned her. Over time, Kakashi comes to accept that Rin chose to die, so his guilt instead becomes about his broken promise to Obito to keep Rin safe. This fact causes Obito’s death to weigh more heavily on him, compounding the regret he feels about what his personality was even hours before Obito died: selfish, condescending, and far too concerned about following the rules. Kakashi feels that, had he cared about teamwork and friendship in the same way that Obito did, Obito’s death might have been avoided.