Here is the COMPLETED cast of My Little Pony: Friendship is Magic Big Bro Showdown!

Princess Twilight Sparkle: otiscat123
Spike: Lol Pugz
Pinkie Pie: MapleRabs VA
Applejack: Kayti Sparklewriter
Rainbow Dash: SKY PAW 122
Apple Bloom: Soccer Star
Sweetie Belle: otiscat123
Rarity: ShootingStar Pony
Big Macintosh: Rob Doss (Seatiebelt)
Shining Armor: Performance Major
Fluttershy: Kayti Sparklewriter
Announcer: MapleRabs as Pinkie Pie
Background Ponies: Amy Pines
-Derpy: Kayti Sparklewriter