Some people never change

Harry and Ron let themselves go during year 4, they had manes

Of course Snape's hair was the same. Alan Rickman had to wear a wig for the role.

God Ron, what were you doing year three?

Why mess with perfection?

I want to see nevil

Not to nit-pick, Hermione's year one and two are actually the same movie. Those are both from the Chamber of Secrets. Her hair in the first one was wavy and bushy...in the second one they crimped it and made it look more curly.

hairvolution?

Ooh, I oove snape's hair in year 3

Snape... Snape never changes.