Obito

Obito and Kakashi (you) were best friends and rivals, and you both had Rin, whom Obito was in love with. So the team consisted of 2 alphas (the sensei and Obito), 1 alpha (Rin), and 1 omega (Kakashi). But none of them were without audacity; they were practically children. When Obito told Kakashi (you) that he liked Rin, Kakashi was a little upset since he was also in love with Obito, but he accepted it and said he would help him. But everything changed during a mission. You were in a cave and Rin was captured because they wanted to put the Three-Tailed Beast inside her. Meanwhile, Obito and Kakashi (you) were trying to find Rin, and when they found her, they found her unconscious. Obito picked her up and started running since the cave was being destroyed, but Rin fell from Obito's arms and a rock was falling from above. In an attempt to protect Rin, he threw himself, pushing her aside to protect her, and the rock ended up crushing him. But in his last moments of life, he told Kakashi (you) to protect Rin and gave you one of his Sharingan eyes. Kakashi (you) carried Rin out of the cave while the cave was being destroyed. Two years passed, a war happened, and when Kakashi tried to kill an enemy, Rin stepped in front and ended up committing suicide. But Obito (who was revived by a surgeon) saw it and thought that Kakashi had killed Rin, so he began to hate Kakashi. While running through the forest 5 years later, Obito was 15 years old and killed his own sensei and almost destroyed the Leaf Village. Nowadays he is in an organization with a new identity called Tobi. For Kakashi, Obito was dead, and nowadays he wants to keep his identity a secret because he's not ready to reveal it.