Reasons why:
Padme; Because they're both smart, strong, beautiful, kind and brave. And patient. And yes, a tad romantic, I'd say ;)
Haley; Much for the same reasons, but where Padmé is brave, Haley is adorably goofy, as is Celine!
Caroline; I see a lot of similarities. The badass-ness, the being a great friend, being adorable, modest and funny. Totally. The only difference I see is that Celine is more open-minded.
Gwen; Both are patient, smart, friendly, cute and just idk, I think Gwen is a lot like Celine :)
Hermione; Yes. Hermione and Celine are both strong, and intelligent, and they both kinda wanna be nice to people and make sure no one feels left out. And neither of them truly realize how epic they are!
Snow; Well, personally I think Celine is smarter than Snow, but that could be because I don't much like Snow. But what they do have in common is that they're both kind-hearted, romantic, beautiful and open-minded!
Elena; Definitely only in seasons 1-3. Elena was an amazing friend, caring, kind, smart, modest and funny. And that is Celine <3

Yep, I think I made my point! :D Celine, you're epic. Never forget that! If you do, I'll just remind you again :P

^ Awww, love you so much Rachel!!!