This is taking place in an alternate Ponyville known as Keldaripolis in the story.

The characters are Anthropomorphic Ponies, and Ponies first and foremost.

Little to no adjustments to the Pony is done in order for the bipedal stance.

The types have the horns and wings respectively, just as Ponies in Ponyville Canonically have.

Note that I picked up a few details from actual and historical Ponies, rather than inventing fancy specializations.

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