Suggestions by @jdeav

Simon Kinberg

as Producer in My Little Pony: Days Of Future Past

Steven Spielberg

as Director in My Little Pony: Days Of Future Past

Alex Hirsch

as Bill Cipher (Voice) in Journey into Space: A My Little Pony Movie

Ryan Reynolds

as Pikachu in Super Smash Bros 6

Denzel Washington

as Fox in Super Smash Bros 6

Michael Shannon

as Kirby in Super Smash Bros 6

Tom Kenny

as Yoshi in Super Smash Bros 6

Brie Larson

as Samus in Super Smash Bros 6

Thomas Brodie-Sangster

as Link in Super Smash Bros 6

Andy Serkis

as Donkey Kong in Super Smash Bros 6

Charles Martinet

as Mario in Super Smash Bros 6

Kevin Michael Richardson

as Lord Tirek in My little Pony And Gravity Falls

Alex Hirsch

as Bill Cipher in My little Pony And Gravity Falls

Tabitha St. Germain

as Rarity in My little Pony And Gravity Falls

Andrea Libman

as Fluttershy/Pinkie Pie/Cozy Glow in My little Pony And Gravity Falls

Ashleigh Ball

as Rainbow Dash/Applejack/Queen Chrysilas in My little Pony And Gravity Falls

Cathy Weseluck

as Spike in My little Pony And Gravity Falls

Tara Strong

as Twilight Sparkle in My little Pony And Gravity Falls

Kristen Schaal

as Mabel in My little Pony And Gravity Falls

Jason Ritter

as Dipper in My little Pony And Gravity Falls