I think maybe Meggie from
Inkheart, I'd give anything to visit Eleanor's house/library, go through every last one of her adventures no matter how harrowing, and besides, she can read herself AND her favorite characters in or out of any book at any time!
Or maybe Violet Baudelaire, from
The Series of Unfortunate Events. Yes, her life sucked, but she met the world's most wonderfully eccentric people, lived in a steampunk era (yay steampunk!), and I love her costumes. I'd love to be able to invent things like she does, too.
But really... I think I'd most absolutely love to be Anne from
Anne of Green Gables. But... wait... hey, that's right, I WAS her!! And I'd ever so gladly do it all over again. <3