Which is Which and Who is Who?

Can you guess who these Flat People are?

I'll give you a hint ...
1.) The first little lady loves dancing, drawing, books and sparkle. She's a big sister with a big love for kittens!
2.) The littlest lady in our "group" loves her Bear-Bear and can talk in sentences now! She may be little but she is usually the star of the show.
3.)The third Flat is the only boy most days but doesn't mind because he is the loudest! He loves Batman and balls too!
4.) The second Flat is quite a character! She loves to Cheer and tell knock knock jokes! She is a big sister too and takes her job very seriously.