Pinkie would represent Turodaron, with her love of entertainment and amusement. Others might find her to be very immature and naive.
Fluttershy would represent Sevestrana, that strange land in the far south. She might enjoy building those temples to Svarog and the gods among the jungles and highlands.
Rarity would represent Heronoja, those bizarre doll-people who worship the Moon and run from ice cream. Like the Heronoi, she might be prone to mood swings and panic.
Twilight would represent Tukshara, a land gifted with ancient wisdom and notorious for running a powerful empire. This country was known for being spacefarers after utilising technology plundered from aliens.
Rainbow Dash would represent Marnos, a land of vulgar hooligans, daredevils, drunks, rednecks, and brawlers — a spitting image of America but with Baltic influence and fire mutants? Marnosyns love black cats as symbols of courage against bad luck, that they even used the animals as national symbols.
Applejack would represent the Arnadjanai, a mighty race of lusty, violent nomadic barbarians. You better run from her before she steals your gold and keeps you as a slave-husband/wife!