So, this is what I have for them so far.
It's copied and pasted from an art request. *feels to lazy to edit it*

Bubbles is probably going to go poof and be switched.

The main one is called Twinkling Glass. She's an aquamarine pony with an electric blue mane. Semi-length. Like younger Luna, but not that exact hair.
(Unless if you want it to be.)
She has the same exact eyes as Twilight Sparkle. (They'll be significant later on in the story.)
She's very clumsy, boisterous, but not really loud and obnoxious, and not the party person like Pinkie. Sometimes she gets full of herself, but, you know. She has a series of four five-point stars as a cutie mark-- they're pink. (Feel free to change the cutie mark, just make it magic related.)
She is a unicorn.
The one that would be the "Element of Kindness" (if I decided to incorporate these exact elements.) would be Paradise, a solid white pony with a sea green mane. Her cutie mark is a palm tree.
She isn't shy, she's actually really talkative. She is an earth pony. Her eyes are green.
Masquerade-- Masquerade would be the Element of Laughter. She's a very snarky kind of girl, but never exactly truly mean. She can make people smile. Her cutie mark is a little pink masquerade mask. Her mane is a shade between Pinkie and Fluttershy's. Her body is a baby blue. She is a pegasus. Her eyes are pink.
Majesty-- Majesty would be Rarity, of course. She has a purple mane, around the same shade as Rarity's, but has a coat like Twilight's. Her cutie mark is a blue flower. She is a unicorn. Her eyes are blue.
Skydancer-- Skydancer would be Rainbow Dash. She is very humble, though, and doesn't really like to fly. The tips of her tail and mane are rainbow, her hair is kind of messy like Dash's, but the rest of the hair that isn't rainbow is a firey beach blond. Her eyes are a scarlet, and her pelt is an apricot color. Her cutie mark has to do with speed though, which will have a backstory later on. She is a pegasus.
Bubbles-- Bubbles would be the Element of Honesty. Bubbles is a shyer type of pony, but much like Bubbles in the Powerpuff girls, she's considered the baby of the group, and is very energetic. She has a light yellow mane with a light shade of Scootaloo colored skin, maybe lighter. Her cutie mark should be similar to Derpy's. She is an earth pony