The Unity Six is Sunny Starscout, Hitch Trailblazer, Pipp Petals, Zipp Storm, Izzy Moonbow, and Misty Brightdawn. Like the Mane Six, they are the current heroes of the now Equestria.
Sunny Starscout - Twilight Sparkle
HItch Trailblazer- Applejack
Izzy Moonbow - Pinkie Pie
Zipp Storm - Rainbow Dash
Misty Brightdawn - Fluttershy
Pipp Petals - Rarity