That sounds like the main character Roger from the animated show Big O. I'd look take a look at him. He's a character that wanted to forget and is fine without his memories. It's strongly implied that he was a very different person before he lost his memories. Watch the episode "Big O - Roger the Wanderer". Roger in the Black-suit is the main post-memory loss self and the ragged tan coat Roger is the pre-memory loss self. See it on YouTube here: Part 1, Part 2, Part 3. Funny enough, re-watching the episode again it heavily implies that all of the characters are changed because of their own memory loss.