Wow, this girls gone far!!! I mean look at this:

Season 1 on cheerios: popular, mean, self-centered
Season 1 pregnant: self-concious, scared, quiet

Season 2: just trying to get back on top, nicer but still a bit mean, really just scared of a future

Season 3 punk: no explination nessesary
Season 3 trying to get beth, that time: unsure where she stood, nothing left to lose, scared of what will happen, easily annoyed
Season 3 beffore the accident like in micheal, heart and on my way: confident, nice, making plans, determined, mature
season 3 now: scared, trying to be brave, upset

These things don't even describe how much Quinn has changed over the years but she is just so unsure or fully confident there's nit really right in the middle for her....

And Quinn

I LOVE santana sooo much, but she hasn't changed really! She was a cheereo, she is a cheereo! She was sassy, she is sassy. She reminds me of me!

~Santana

^Well she has become more of a main charechter and came out.

Her character is so bipolar by the writers' faults. One day she's nice, next she's mean. One day she's happy, next she's paralyzed.

come one, almost every character has changed alot but still has elements the same as their character in season 1 and still resembles their older selves to a decent extent while he went from a homophobic meathead bully to a kind, sensitive, guy that accepts his own and others sexuality.

The whole glee club has changed pretty drastically. It's hard to pick just one. But looking at Puck in the pilot where he locked him in the portly-potty to where he is now. Tossing Kurt and other kids into dumpsters. To being calling Kurt his boy and where he is now. Sure he still chases girls and even that has changed now(he'd never try to get with any of the glee clubs girlfriends).

like duh! He changed from bully who hates gays to a gay who gets bullied

everybody has changed but Quinn is definitely who has changed the most

and then Dave, Santana, Kurt and Emma

Season 1 - 3: Quinn!

Season 1 - 4: Tina definitely!