Personally, I'm a big fan of Studio Ghibli. There are some strong and willful girls from those movies that would provide for an interesting spanking scene or two.
Chihiro and Kiki are my two prime spanking targets. They're strong characters who are also kind of reckless and whiny at times.
Then again, some one like San from Princess Mononoke would probably kill anyone who tried to spank her.
And then there are the girls from My Neighbor Totoro, who are so cute they
have to be spanked
-Lawrence