Which character started as an awful stereotype, then got humanized?

Sometimes, you meet a character and he or she is a total one-dimensional caricature. Maybe it's the embodiment of an ethnic stereotype, or a gender one. Or maybe a stereotypical nerd, or jock. And then, over time, a miracle happens: he or she becomes a living, breathing person. Who's your favorite stereotype who became a real boy or girl?

Please include a picture or clip of the character in question. And please mention the name of the show/book/comic/movie series, and what the turning point in this person's evolution was in your view. Thanks!

Top image: Plastic Mickey from Doctor Who, "Rose." Which basically sums up Early Mickey.