My Little Pony/Columbia TriStar

Dragon Tales

 * Spike as Max
 * Twilight Sparkle as Emmy
 * Rarity as Enrique
 * Rainbow Dash as Ord
 * Fluttershy as Cassie (Pinkie Pie won't work because Cassie is shy and Pinkie is hyper)
 * Applejack as Zak
 * Pinkie Pie as Wheezie
 * Sunset Shimmer as Spike

Bear in the Big Blue House

 * Twilight Sparkle as Bear
 * Pinkie Pie as Treelo
 * Applejack as Ojo
 * Rainbow Dash as Tutter
 * Fluttershy as Pip
 * Rarity as Pop
 * Vinyl Scratch as Luna
 * Octavia as Shadow
 * Big Macintosh as Ray
 * Jinx as Flutter

Thomas and the Magic Railroad

 * Spike as Thomas
 * Sea Serpent as Henry
 * Chief Thunderhooves as Gordon
 * Cranky Doodle Donkey as James
 * Angel as Percy
 * Big Macintosh as Toby
 * Sonic (from Sonic) as Bertie
 * Owlowiscious as Harold
 * Pound Cake and Pumpkin Cake as Annie and Clarabel
 * Discord as Diesel 10
 * Twilight Sparkle as Lady

Jay Jay the Jet Plane

 * Rainbow Dash as Jay Jay
 * Pinkie Pie as Herky
 * Twilight Sparkle as Tracy
 * Fluttershy as Snuffy
 * Princess Celestia as Brenda Blue

Muppets from Space

 * Applejack as Kermit
 * Rarity as Miss Piggy
 * Pinkie Pie as Fozzie Bear
 * Iron Will as Sam the Eagle
 * Scootaloo as Animal
 * Applebloom as Pepe the King Prawn
 * Trixie as Bobo
 * Rainbow Dash as Clifford
 * Sweetie Belle as Rizzo
 * Discord as Edgar K. Singer
 * Dr. Caballeron as Dr. Phil van Neuter
 * Cheese Sandwich as Johnny Fiama

Open Season

 * Discord as Boog
 * Spike as Elliot
 * Princess Ember as Beth

The Adventures of Milo and Otis

 * Pinkie Pie as Milo
 * Rainbow Dash as Otis