Given a multiverse full of infinite possible realities, it stands to reason that at least one version of Twilight Sparkle would end up as a magical anthro-cat schoolgirl ninja. That's just *physics*, y'all.
"Burninating the countryside... burninating the peasants... burninating all the peoples... and their thatched-roof COTTAGES! THATCHED-ROOF COTTAGES!! And the Trogdor comes in the NIIIIGHT!!!"