The de facto leader of our central cast. A unicorn who’s extremely book smart and good at magic, but is a bit new to this “social life” thing. She’s been assigned by her boss, Princess Celestia, to study the “magic of friendship” in Ponyville, which is the excuse for the plots-of-the-week and the Mork Calling Orson bits at the end of each episode.
Twilight’s assistant/friend/baby dragon/personal mail system. Though he’s supposed to be helping Twilight study magic, his job is mostly to provide snark. He’s also one of only two legacy characters in the series, thanks to Hasbro losing the licenses to the old ponies. The other one is...
An earth pony who is proprietor and operator of Sweet Apple Acres, an orchard outside of town. Applejack is stubborn, blunt, and not much given to subtlety, but she’s also honest, reliable, and as faithful a friend as you could ask for.
A pegasus pony who LOVES to fly--preferably fast, and flashy. Rainbow Dash is in charge of keeping Ponyville’s weather under control, and though she’s a bit proud and insensitive at times, she cares deeply for her friends, and would never leave them--except maybe in her dust.
Pinkie Pie is an earth pony who is the living embodiment of a sugar rush. She loves to party, and celebration seems to follow her like a wake behind a ship. If she has an off button, it hasn’t been found yet--but though she can be a bit irritating, she’s always a joy to have around.
Rarity is a unicorn who is all about the fashion. She runs a fashion shop of her own in Ponyville, and is quite the artiste. She’s somewhat posh and a bit of a perfectionist, which can lead to her clashing with the down-to-earth Applejack, but if her friends or town need her, Rarity always pulls through.
Fluttershy is a pegasus pony who is quite literally scared of her own shadow. She’s timid, quiet, and, well, shy, which makes her ideal for her job of working with animals, but despite her own fears she’s always willing to help out, providing that little bit of kindness wherever it’s needed.
Together they get into hi-jinx, laugh, cry, squabble, and save the world once or twice. Just like any other group of friends, huh?