I have thought and pondered about this all week and the only name I can come up with is.... he who should not be named. And, it's not actually HIM...it's the Tom Riddle that might have been. But, saying that, even with Tom, he showed no sense of wanting to be redeemed. He shares many of the stereotypes about serial killers/psychopaths:
~tortured and killed animals
And, the more I type, the more I'm thinking that Voldemort could not be redeemed....unless it was early early in his life, but then, we wouldn't have a Harry Potter series to enjoy.
What about you?