The Characters in the Play are in alphabetical order. I'll List the Cast and see what TV show and movie they came from:
Vlad (Horton Hears a Who (2008)) as Vlad (Jim's minion)
Pinkie Pie (Young) (My Little Pony) as Young Carmen
Pinkie's Family (My Little Pony) as Carmen's Deceaded Family
Rainbow Dash (Equiestria Girls) as Kala
Dolores and Morries Nooly (The Guest) as Dolores and Morries Nooly (Kala's parents)
The CMC in their Play Costumes (My Little Pony) as Empress Anna (Scootaloo), Princess Yum Yum (Adoptive sister of Carmen) (Apple Bloom), and Queen Elsa (Sweetie Belle)
Morton (Horton Hears a Who (2008)) as Young Tantor
Alpha, Gamma and Beta (Up) as Alpha, Gamma and Beta
Pinkie Pie (My Little Pony) as Carmen
Pinkie Pie as General Flash and Fluttershy as Admiral Fairy Flight (My Little Pony) as General Flash and Admiral Fairy Flight
Nigel (Rio) as Jim
Magic Mirror (Snow White) as Magic Mirror
Ratigan (The Great Mouse Detective) as Tantor
Mushu (Mulan) as Shang
Voice Cast[]
Adult Carmen - Anne Hathaway
Young Carmen - Andrea Libman (uncredited)
Shang - Billy Connolly
Jim - Micheal York
Vlad - Will Arnett
Adult Tantor - will.i.am
Young Tantor - Hayley Joel Osmost
Dolores Nooly - Glenn Close
Morries Nooly - John Goodman
General Flash and Admiral Fairy Flight - Andrea Libman