Suggestions by @maxcarter

Hans Conried

as Discord in My Little Pony (1950-1959)

Eleanor Audley

as Princess Luna in My Little Pony (1950-1959)

Katharine Hepburn

as Princess Celestia in My Little Pony (1950-1959)

Marilyn Monroe

as Starlight Glimmer in My Little Pony (1950-1959)

Sheila James Kuehl

as Scootaloo in My Little Pony (1950-1959)

Annette Funicello

as Sweetie Pie in My Little Pony (1950-1959)

Sherry Jackson

as Apple Bloom in My Little Pony (1950-1959)

Lucille Bliss

as Spike in My Little Pony (1950-1959)

Adriana Caselotti

as Fluttershy in My Little Pony (1950-1959)

Ilene Woods

as Rarity in My Little Pony (1950-1959)

Mae Questel

as Pinkie Pie in My Little Pony (1950-1959)

Lucille Ball

as Rainbow Dash in My Little Pony (1950-1959)

Doris Day

as Applejack in My Little Pony (1950-1959)

Doris Day

as Apple Jack in My Little Pony (1950-1959)

Judy Garland

as Twilight Sparkle in My Little Pony (1950-1959)

Daran Norris

as Maxcarter in Who'd Voice will the Mycast Users?

Brian Drummond

as Maxcarter in Who'd Voice will the Mycast Users?

Hank Azaria

as Maxcarter in Who'd Voice will the Mycast Users?

Ben Diskin

as Maxcarter in Who'd Voice will the Mycast Users?

Steve Blum

as Maxcarter in Who'd Voice will the Mycast Users?