Sasuke Uchiha

As a child, Sasuke was very kind and kind to his family and respectful of his clan and teachers. He was very proud to be Fugaku's son and Itachi's brother, having a strong desire to emulate them, desiring his father's approval and recognition.[12] This changed after the Uchiha clan massacre, which turned Sasuke into a cold, cynical and arrogant young man, becoming a self-styled avenger dedicated to killing Itachi and restoring the Uchiha clan.[13]

During his time at the Academy, Sasuke was a loner, spending more time alone honing his skills than socializing with the other students, ignoring the many girls who were attracted to him in favor of solitude. When first introduced to Team Kakashi, Sasuke has shown great indifference towards others, feeling that his abilities are superior to those of his teammates, seeing them as nothing more than an obstacle to him and his own advancement. Despite this, having worked with Team Kakashi, Sasuke has grown to care more for his team and has begun to see them as family of sorts, becoming willing to risk his life to save those close to him on several occasions. Sasuke also had a competitive streak, sometimes accepting Naruto's challenges just to show that he was the superior of the two. According to Kakashi, Sasuke has both a superiority and an inferiority complex, as he is unwilling to acknowledge when someone is stronger than him, but becomes obsessed when he believes they are. Sasuke set aside his rivalry towards Naruto when he was assured that he was the best, however, this changed after he noticed Naruto's rapid growth after the latter defeated Gaara. After a short battle with Itachi, whom he defeated Sasuke without much effort, he concluded that his time in Konoha surrounded by his friends had made him weak and that Orochimaru and his Cursed Seal of Heaven would give him the power to exact his revenge. . Regardless, Sasuke didn't quite stoop to the level Itachi believed he would, choosing not to kill Naruto, his best friend, to gain the Mangekyō Sharingan, choosing to gain power through his own path.

After his training under Orochimaru's tutelage in Otogakure for two and a half years, Sasuke has become a cold and calculating person, completely dedicated in his only desire to kill Itachi, considering that his own life didn't matter to him. By severing the bonds he believed bound him, Sasuke was apparently willing to kill Naruto just to prove a point with how much he had changed. Due to his newfound abilities, he has retained his habit of underestimating his opponents, rushing into combat without a clear understanding of their capabilities and suffering for it, though he acknowledges his mistakes from time to time. Sasuke had also developed a strong sense of pride towards his clan; such as his evident disdain for non-Uchiha possessing the Sharingan.[14] Despite this, Sasuke was not above forming bonds with those around him, forming a new team, which he came to see in a similar light to Team Kakashi and doing everything possible to protect them.