yay, an easy one.  Topanga for sure.  She always (in early seasons, at least) was so outspoken about following her own path.  She was so true to herself, smart, and did not care what anybody thought of her.  As a shy follower-type of kid, I really looked up to that.  And I admire her relationship with Cory, and the fact that she abstained until marriage.  She annoyed me every now and then, but Topanga as a whole was a fantastic character who I think very highly of.

…and I STILL want her hair.