Who is Obito Uchiha of Kakashi Gaiden?

Who is Obito Uchiha of Kakashi Gaiden?
Best friend to Kakashi and the one who gave him his Sharigan eye.Obito Uchiha was the teammate of Kakashi Hatake and Rin under Minato Namikaze. He was frequently late for missions as a result of what he claimed were random good deeds he'd carry out along the way.Obito often spoke without thinking, a trait that Minato considered a flaw, but was very impassioned and persuasive in doing so. He also seemed to have had a crush on Rin. During the Kakashi Gaiden arc, Rin is kidnapped by enemy ninja.When Kakashi is unwilling to go and help her, Obito states that those who do not save their teammates are trash. Obito goes to save Rin by himself, though Kakashi, touched by his words, soon joins him.During their attempt to save Rin, Kakashi lost his left eye as a result of taking an enemy ninja's attack for Obito. To protect Kakashi in return, Obito managed to awaken his Sharingan and killed their assailant.Soon after saving Rin, Obito is crushed in a rockslide when he pushes Kakashi out of the way. With their surroundings continuing to cave in on them and Obito unable to move, Obito gives Kakashi his remaining Sharingan eye as a gift.Kakashi and Rin are forced to leave him as the cave collapses, and Obito uses his last moments to wish he could have spent more time with Rin and the rest of his team.