The Main 6 of the alternate universe are Sunset Shimmer (Twilight Sparkle), Sunny Flare (Rarity), Lemon Zest (Pinkie Pie), Indigo Zap (Rainbow Dash), Sour Sweet (Fluttershy), Sugarcoat (Applejack).
Sunset is the main character and the others are secondary main characters.
Other Main Characters:
Twilight Sparkle/Midnight Sparkle (Sunset Shimmer)
Moondancer (Starlight Glimmer)
Starlight Glimmer (Trixie)