For me it doesn't matter so much what type of character she is, but that she's a strong character with a definite personality. Nothing worse than a girl with a complete lack of personality...
I've always tended to prefer smaller feet for some reason. UK size 4 seems to be the optimum size for me! But then again, feet of all sizes are beautiful to me too. It's weird how size preferences can occur though!
I think I must have started fantasizing at the age of about 11/12, usually about tickling celebrities' and crushes' feet.
I remember grabbing my teenage baby sitter's feet and tickling them for no apparent reason. I think that's when I realized I had a fetish...