How we picture characters

[Cheryl]

Someone on HP for Grownups brought up a discussion of Lavendar Brown, 
who is generally pictured in fanfics as a blond Caucasian girl due to 
complete lack of description in canon.  I always pictured her as a 
slender, pale girl with sort of mousy brown hair.  According to the 
movies, she's black.  Who knew?  Fanfics had a huge problem with 
Blaise Zabini - no one knew he was a boy for the longest time and he 
is female in many many fanfics!  My question for you is:  How have the 
movies influenced your view when you read the books?  Snape will now 
and forever be Alan Rickman when I read the books - I use Rickman's 
voice and inflections now when I read.  Harry will always be Dan 
Radcliff.  However, Movie Sirius and Movie Lupin are not even CLOSE to 
how I see them in the books, and we won't even discuss Dumbledore.  
Movie Hermione was dead-on as a child, but now... not so much.  What 
movie characters are closest to your book visions and why?  Does 
ANYONE not think Rickman is the most perfect Snape ever?

Cheryl