My list goes a little like this:
1 - Vanellope Von Schweetz from the movie Wreck-It Ralph. She's basically this cute, sassy little girl; she basically was my favorite throughout the entire film.
2 - Hatsune Miku, the popular vocaloid from Japan. This one is probably one of the most cliché characters, but come on, who doesn't like parading around in pigtails? :P
3 - Rapunzel from the movie Tangled. Enough said for this one, because it's nearly every transgendered's dream to be a princess for a day.
4 - Black Widow from The Avengers. This girl was basically the eye candy for all the guys, and while she did do that for me, she was also a warrior, kind of, and that stuck out to me in a good way.