Suggestions by @bobbyhavens

Arthur Darvill

as ArthurLight in DC

Jay Lycurgo

as Obsidian in DC

Gaspard Ulliel

as Victor Von Doom in Fancasting Spider-Man villains in MCU

Teo Briones

as Count Vlad Tepes Dracula in Fancasting Spider-Man villains in MCU

Anthony Carrigan

as The Vermin in Fancasting Spider-Man villains in MCU

Taylor Lautner

as Slim in Avatar: The Last Airbender

Erick Avari

as Due in Avatar: The Last Airbender

Robbie Daymond

as Tho in Avatar: The Last Airbender

Kim Joon-hyun

as The Big Bad Hippo in Avatar: The Last Airbender

Benedict Wong

as Yu in Avatar: The Last Airbender

Ken Leung

as Mechanist in Avatar: The Last Airbender

Miyako

as Pipsqueak in Avatar: The Last Airbender

Alex Pettyfer

as Lucifer in Supernatural Reboot

Anthony Hopkins

as Pestilence in Supernatural Reboot

Jack Cutmore-Scott

as The Shadow (Incarnate) in Supernatural Reboot

Abigail Savage

as Madame Queen Zimba in Son of Dracula

Erica Durance

as Sarah in Son of Dracula

Oscar Isaac

as Colonel Caldwell in Son of Dracula

Richard Armitage

as Party Guest in Son of Dracula

Ben Barnes

as Andy in Son of Dracula