Sorry Principal Celestia, you must be >this< regal to get flow sparkly hair. Anyway I loved this ask. Had to do it!
She’s an earth pony, like how principal cadence is a Pegasus. The eqg counterparts are whatever the ponies were before aescension, and in sil’s headcanon, the royal sisters started as earth ponies
Oh. Huh. *blink*
Then why did Celestia have to remove SciTwi’s wings at one point? Wouldn’t she have just been a unicorn?
She would’ve been, yes! In my headcanon at least, SciTwi is affected by Twilight’s ascension because they’re specially linked by the Element of Magic. So even if Twilight ascended, if Sunset hadn’t brought Equestrian Magic to the mirror world in the first place, SciTwi probably would’ve just been a unicorn (unless the elements still linked in some other way)
It’s also why the eqg!mane 6 are all restricted to being the same species as their counterparts, whereas other ponies have a bit of fluidity, like the Cake Twins swapping unicorn/pegasus traits :3c
Princess Celestia: The birth of an Alicorn is something Equestria has never seen!
Princess Luna: It is beyond even our understanding.
They might predate Equestria. And might need some sex ed. Or at least genetics.