Rarity is a white fashonista unicorn. She makes clothes for a living, and also does it for favours for her friends. She lives at carousel boutique by herself, though her younger sister Sweetie belle often comes to stay or visit. While she may only be living in a small boutique in Ponyville, that doesn't mean she doesn't have important clients: She's made dresses for many important occasions and ponies, like the Canterlot wedding, Sapphire shores and many more. Spike (the baby dragon) is a not-so secret admirer of Rarity, and is always eager to help her out in any way he can. She also has a white persian cat named Opalscence.

Her cutie mark is three blue diamonds.

She represents the element of Generosity

Pinkie pie is the pink earth pony who lives in Ponyville with mr. and mrs. Cake in Sugarcube corner, where she helps with baking the goods. She's bubbily, bouncy and fun, as well as the party planner for almost all of Ponyville's parties. Pinkie was the first of the mane 6 to meet Twilight Sparkle when she came to Ponyville, and planned her "Welcome to Ponyville" party in Twilight's library. She also has a pet alligator named Gummy, that she is often seen playing with. Pinkie pie represents the element of laughter.
Her cutie mark is 2 blue balloons and 1 yellow
 

Fluttershy is a yellow pegasus with a kind and timid heart. She loves caring for all kinds of critters, and is far more comfortable in their presence than around other ponies. She may be timid, but she's faced dragons (which she has a great fear of), manticores, bears and other dangerous animals and mythilogical creatures.

Fluttershy lives in a small cottage surrounded by a small stream on the outskirts of Ponyville and close to the Everfree forest. She cares for her sick animals their, letting them stay while they recover. Out of all of her animals, the most prominent one that she cares for the most is a white bunny named Angel.

Her cutie mark is three butterfiles.

She represents the element of kindness.

Spike is Twilight Sparkles faithful dragon assistant. She hatched him from his egg when she was a filly and has cared for him ever since. While he can be sarcastic, lazy, and laughing at the wrong moments, he's also loal to his Dragon code (from "Spike At Your Service") and of course, the mare who raised him: Twilight. But that doesn't stop him from having a massive (and not so secret) crush on Rarity, helping her out in every way possible.

Sunset shimmer is Celestia's former student, before Twilight. When she didn't get what she wanted, she grew evil and wicked and traveled through the portal to the alternate universe. There, she's a school bully and keeps her title as "The princess of the fall formal" every year, until Twilight takes it from her.

Sunset shimmer is an orang unicorn, and her cutie mark is a yellow and orange sun.

Adagio Dazzle is the leader of the band "The Dazzlings" in Equestria Girls: Rainbow Rocks. She, along with Aria Blaze and Sonata Dusk,were sirens which had the power to charm ponies with their music: But, to gain this, they fed on the negativitey and distrust of others.

They were soon banished by Starswhirl The Bearded to another world, where Caterlot High is situated. Here, taking the form of humans, they fed on the negativity via a red jewel around their neck.

Out of the 3, Adagio is the more manipulative and "bossy" of the band. She is constantly fed up with both Sonata and Aria's antics.

Adagio (in music terms) means "slow".

Sonata Dusk is a back up singer in the band "The Dazzlings" in Equestria Girls: Rainbow Rocks. She and Adagio Dazzle and Aria Blaze are mythical creatures called Sirens, which had the power to charm ponies with their music: But, to do this, they had to feed off of the negativity of ponies around them.

Starswhirl the Bearded quickly managed to banish them to another world, which just so happened to be where Canterlot High is situated: Here, the sirens took the form of 3 teenage girls and fed off of the negativity in Canterlot High.

Out of the 3, Sonata is more quirky and lovable, and constantly getting into arguments with Aria.

In music terms, the word Sonata means is a compisition for an instrumental solist, usually with a piano accompaniment.

Aria Blaze is a back up singer in the band "The Dazzlings" in Equestria Girls: Rainbow Rocks. She, along with Adagio Dazzle and Sonata Dusk, are mythical creatures called sirens that charmed ponies with their music: But they had to feed off of the negativity of others to gain this power.

They were quickly banished my Starswhirl the Bearded to another world where he believed they would not be able to use their magic: This world was where Canterlot High was. Here, taking the form as teenage girls, they fed using a red jewel around their necks.

Out of the 3, Aria is shown as negative and constantly whining about Sonata or the world they had been banished to.

Aria is a long, accompanied song for a solo voice in music terms.