So I'm thinking about how creepy Twilight Sparkle can get here:
Way back in s1 ep1 she's a loner who blows people off while obsessing over doomsday prophecy.
Then she casually either copies or already has a spell only otherwise possessed by an enraged dark god,
whom she coolly charges at with every obvious intention of goring.
Later, she turns mice into horses- we never find out why, exactly, but this seems to freak
out her friends.
She'll happily invade someone's mind to mush memories into them (totally justified, i know...but just
the fact that she can do that...yikes). Then she turns pony to stone/banishes from material plane.
Oh yeah, and then she like mind controls a whole town in a fit of insanity.
Her possessiveness towards her brother comes off more than a little creepy too.
Like, in a no wonder her sister-in-law insisted on moving far far away kind of way.
Then she's like:Dark magic, see once, copy without difficulty.
Like, why is that so easy for her?
And now we've got her practicing a potentially dangerous polymorph spell outside to work on her aim,
followed by her casually annihilating dozens of ponies, or at least pony like intelligences on the grounds that they are a nuisance.
Ragnarok Sparkle?