Suggestions by @jdeav

Seth MacFarlane

as Sprunga in My Little Pony: Make Your Marks

J.G. Quintel

as Mordegar in My Little Pony: Make Your Marks

Tara Strong

as Twigar Spurkle in My Little Pony: Make Your Marks

Christine Marie Cabanos

as Mugar in My Little Pony: Make Your Marks

Jason Ritter

as Cupgar in My Little Pony: Make Your Marks

Tara Strong

as Elger in My Little Pony: Make Your Marks

Daniel DiVenere

as Spikegar in My Little Pony: Make Your Marks

Eric Kirchberger

as SCP-999/Shy (Earth-1021) in My Little Pony: Make Your Marks

Thomas Lennon

as SCP-049/Plague (Earth-1021) in My Little Pony: Make Your Marks

Ron Funches

as SCP-173/Sculpt (Earth-1021) in My Little Pony: Make Your Marks

Joe Hanna

as Elder Kettle (Earth-1021) in My Little Pony: Make Your Marks

Miranda Cosgrove

as Ms. Chalice (Earth-1021) in My Little Pony: Make Your Marks

Jack McBrayer

as Mugman (Earth-1021) in My Little Pony: Make Your Marks

LS Mark

as Cuphead (Earth-1021) in My Little Pony: Make Your Marks

The Meatly

as Henry Stein (Earth-1021) in My Little Pony: Make Your Marks

Hailey Lain

as Alice Angel (Earth-1021) in My Little Pony: Make Your Marks

Jeff Goldblum

as Boris (Earth-1021) in My Little Pony: Make Your Marks

James Rallison

as Bendy (Earth-1021) in My Little Pony: Make Your Marks

Erica Lindbeck

as Loona (Earth-92003) in My Little Pony: Make Your Marks

Keith David

as J'onn J'onnz/Martian Manhunter (Earth-1129) in My Little Pony: Make Your Marks