There are a surprising amount of things in mythology and fiction that are like variations of unicorns.
My personal favorite "evil unicorn" variation is the bicorn , bicorns are said to be just as powerful as unicorns but are far more aggressive and have two horns instead of one.
(Which bicorns could pretty easily be translated to mlp their aggression could be translated as the same cultural militarism as Pegasi, maybe the others think of bicorns as evil because of something that happened a long time that caused bicorns to separate from the rest of pony society, and of course this would end up with a culture of ponies distinct from equestria who think fighting fair is for idiots)
Hahaaaa nice! I knew of bicorns actually! Love em. I am planning on naming a pirate ship the bicorn in this fic I'm writing. its kind of strange that in mlp, a lot of unicorns are elitist as hell. Imagine having two horns Having two horns makes you MEAN
It seems to me the big reason unicorns are elitist is because they're the 1% like 99% of the time. (I mean, Kirin aren't elitist ass holes, and they also have spell casting abilities)
And unicorns seemingly tend to have a very scholarly theory based view of magic, especially spell casting. Meanwhile, I fully imagine if a bicorn taught you how to fight using magic they'd tell you to shoot the other guy in the balls after throwing sand in his eyes cause you either fight dirty or your stupid and dead.
It's aaaalways about the classism...
I mean, we see in the show that rarity is always having to deal with the pressure of trying to live up to the classist views of unicorns (and sometimes cracking like the time she gentrified that restaurant).
Basically, unicorns are aristocrats and scholarly wizard aristocrats. So it'd definitely be interesting for bicorns to be a sort of antithesis of this idea , so bicorns would basically be living in a sort of meritocracy , and this, alongside them having a militaristic culture like pegasi basically means they'd be a bunch of spellcasting soldiers who just wouldn't respect people like spoiled rich because spoiled didn't earn where she is in society through her merit.
Which could've resulted in an interesting episode, maybe rarity and someone else (maybe twilight) end up having to solve a friendship problem somewhere, which ends up being the bicorns arguing over whether they should even join equestria or just remain in the shadows