Suggestions by @batboy1999

John Cleese

as MacFroogle/ Narrator/Seagull/Rat in The Ballad of Nessie (2001)

Fran Brill

as Nessie in The Ballad of Nessie (2001)

Kathryn Mullen

as Nessie in The Ballad of Nessie (2001)

Tress MacNeille

as Nessie in The Ballad of Nessie (2001)

Caine (The Amazing Digital Circus)

as Stefán Karl Stefánsson (R.I.P.) in What characters would you like to hear voice actors voice?

Ace Ventura

as Stefán Karl Stefánsson (R.I.P.) in What characters would you like to hear voice actors voice?

Stanley Ipkiss/The Mask

as Stefán Karl Stefánsson (R.I.P.) in What characters would you like to hear voice actors voice?

Seth Green

as Fuller McCallister in Home Alone (1980)

Nessie (Disney)

as Ellie Kemper in Characters you want famous actors to voice act.

Martha Lorraine

as Ellie Kemper in Characters you want famous actors to voice act.

Gadget Hackwrench

as Ellie Kemper in Characters you want famous actors to voice act.

Kida Nedakh

as Zoe Saldana in Characters you want famous actors to voice act.

FAKE

as Zoe Saldana in Characters you want famous actors to voice act.

Snoopy

as Jim Carrey in Characters you want famous actors to voice act.

FAKE

as Nicole Oliver in What characters would you like to hear voice actors voice?

Alan Menken

as Composer in An American Tail (1996)

Robin Williams

as Henri le Pigeon in An American Tail (1996)

Simon Wells

as Director in An American Tail (1996)

Phil Nibbelink

as Director in An American Tail (1996)

Paul Kandel

as Henri le Pigeon in An American Tail (1996)