"You don't have a name for it? So, what, you're pre-spaceflight?"
"I'm not sure. That depends on exactly where space starts. But not with spaceships or anything like that."
"Do you know whereabouts your homeworld is?"
She nods. "In a parallel universe." She looks at me. "Am I going to have to explain this every time?"
Personally, I kind of figured that Equestrian ponies are basically fey or fairies. I mean, they live in an alternate universe, they have magic (even the ones that don't cast spells), and they pretty much explicitly act like the stewards of their world doing everything from changing the seasons, moving the clouds, telling the animals when to move and hibernate, and controlling the celestial bodies to allow night and day to happen.
If the DC universe has two planets full of New Gods running around and awakening someone into godhood is as easy as pointing a Father Box at them, it shouldn't be too much of a stretch to call Shimmer "A magical creature from another dimension. Back home, her kind used to act as stewards for their planet's ecosystem until they hit the industrial revolution and automated most of it. She stepped through a one-way portal, got turned into a human, and now she's studying the magic we have here."
I mean, I'm a fan of MLP, but even
I can see it getting pretty awkward for a magical being from another dimension showing up on Earth and introducing itself with the same name we use for nonsapient beasts of burden. Especially since ponies from Earth and Equestrian ponies are so vastly different physiologically. Again, it would be like a bunch of humans running around calling themselves orangutans, even when it's
very clear that they don't have long arms adapted to swinging through trees and and can't hold stuff with their feet.
~People are hanging around Metropolis when the sky darkens and a bunch of alien ships show up.~
General Zod: People of Earth! I am General Zod, supreme leader of... the Bunnies!
Grayven: *spits out his coffee*
General Zod: Yes.... that's right! Tremble in fear! My people have been star-hopping through the galaxy for years ever since our home planet of Rabbitupiter
imploded under mysterious circumstances.
Flash: What was that?
Superman: *blinks in confusion and then pulls out a tablet showing a picture of the glyphs for his rocket telling the history of his people. He squints at one symbol, turns the page upside-down, and his eyes widen in shock as his mind gets blown.*
General Zod: But this is the perfect planet to rebuild our empire and this city looks like the perfect site for New Bunnieopolis! *places a flag with a giant carrot on it* Surrender to us now, or prepare to have your hopes crushed under the lucky feet of your new Bunny overlords!
Kryptonian Soldiers: *holding plasma rifles and hopping around through the streets, causing earthquakes* Hippity-hoppity! Hippity-Hoppity!
Batman: I wasn't prepared for this.