Rose Weasley. She's my favorite character, and product of my 2 favorites in the Golden Trio. Plus, meeting Albus Severus Potter would be pretty awesome :)
Hermione, because she's intelligent, pretty, and quite honestly, I'm a lot like her as is. Although it would be lovely if I could be myself! And, to be honest, I've always wanted to know what it's like to be Voldemort, Draco, and Bellatrix. Is that wrong? Meh. Just curious, haha.