Alicorn Twi confirmed.
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For the ones that stumbled upon this without knowing what's going on: Purple smart pony is going to get wings later on and become a part of the master Alicorn race.
I don't see the big deal why the community is getting butthurt over it, she's still old Twi just with wings added. Inb4 no background characters even notice or care just like the times they've saved the world.