This is really interesting isn't it?
Atticus Finch is a brilliant one, I find him really hard to top.
I think the only other character who's stayed with me in the same way is Lang Rab /Long Rob in Sunset Song. I was so in love with him, he was my first book-love!
I find something really appealing about Emma from, er, "Emma" too - I think it's her faults that make her quite likeable.
I'll probably spend the next 2 days thinking about this now...