Circe
I don't think Circe is necessarily a good character, but I believe she has a few redeeming qualities- at least, more redeeming qualities than some of the other people in the Odyssey. Obviously turning men into pigs isn't a great thing to do, but it was nice of her to turn them back. After reading this story, I think that Circe feels that men are dumb, or maybe she legitimately thinks of them as pigs. Odysseus, however, surprises her, and she views him as worthy of her time and gives him a chance. She even completes his requests after he outsmarts her with the help of Hermes. As enchantresses go, I think she's pretty good. Although she turns them to pigs, she does change them back and even lets them leave eventually.