I'd say I relate most to Belle.
When I was younger, I was a HUGE bookworm. I don't have as much time anymore, but I still get lost in books, and usually finish them in a day.
Plus, I really relate to the whole looking for adventure and something more out there. My life's okay, but it's pretty mundane. I'd give anything for some adventure.
Also, she's kinda held back by her family. Like, she loves her dad, but he kinda limits what she can do, when she has to go back for him. I feel like that a lot.
Mostly though, I love how she's independent and not afraid to speak her mind. :]
I also relate to Ariel a little bit. Again, just looking for adventure and following her dreams, no matter how hard it is to acheive them.
JEEZ, I sounded crazy corny!