What do you think ?

I suppose these could count as pegacorns. Although since thestral wings are different wing types to regular ponies, I wonder how the horn design could be modified. Just like wings, horns also have multiple variants (normal, curved, jagged, kirin, goat).

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I think that would depend on the Unicorn-Parent

p.s. do you think that Luna was a bat-pony before becoming an Alicorn

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I doubt princess Luna to have been a bat-pony as she would likely maintain those traits through ascension.

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I wonder how the horn design could be modified. Just like wings, horns also have multiple variants (normal, curved, jagged, kirin, goat).

I know

https://www.fimfiction.net/group/151/supporting-original-characters/thread/514557/how-do-you-pick-between-the-different-horn-and-wings#comment/7821366

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Deripibooru tags them as "bat pony alicorn"s, and also aliases things like "baticorn" for them!
https://derpibooru.org/tags/bat+pony+alicorn

--Sweetie Belle

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ok, well

https://derpibooru.org/search?q=pegacorn%2C+batpony

also
https://derpibooru.org/search?q=pegacorn%2C+niclove

https://derpibooru.org/search?q=oc%3ACottonRose