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Dashie also has a truly enormous ego. "I prefer to think of them as everypony's trophies but with my name permanently etched onto them."

Discord is not a dragon but his own kind of beast, and is one of a series of antagonists - typically seasons start and end with some major threat, and the rest of the episodes are more ordinary in nature, especially in the earlier seasons. He's now a mostly-reformed character. He's still incredibly annoying (both to the other ponies and to the viewer).

Ponies are either unicorns (whose horns do telekinesis and maybe some other magic - Twilight, Rarity), pegasi (can fly - Dashie, Fluttershy), or earth ponies (neither - Applejack, Pinkie Pie) - save that the ruling caste, Princesses Celestia, Luna, and Cadence are "alicorns" with wings and horns, and Twilight recently turned into one and is now a princess.

There's some male supporting characters but essentially the Celestian Regime is a matriarchy.

ceb and I have an extensive dissertation on how it's actually a failed Soviet state and Ponyville is a Potemkin village, but this may not be necessary to understand it from the point of view of tinies.