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I can't really think of anything offhand, except for maybe the Dead Men of Dunharrow, since originally they refused to aid Gondor and then they realized that the only way to end their curse was to help Gondor out in the war. However, I don't think this is really repentance, just a means to finally get to rest.
Since I can't think of any example of true repentance, I'm just going to say that even though Grima didn't truly repent, per se, he and most others who have been corrupted had the potential to repent. I think that his killing of Saruman showed that he wasn't entirely evil, as has been suggested by a few.
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