Obi-Wan and Rey
He saved a lot of people with it too, before. His choices were his own; the lightsaber itself can be used for good or evil, depending on its user. I hope it will be used for good in the future. Maybe that way, we can begin redeeming what he did.
He was... confused. Passionate. Very clever. He and his mother were enslaved when we first met them, during his childhood. He was a brilliant pilot and mechanic, even then. I don't think I understood him as well as I should have. I think he had a lot of emotion that he didn't know what to do with. Fear, of losing the people he cared about, like his mother. Fear of not being able to do enough to save them.