Suggestions by @vikingwendigo

Symbiotes

as Alien in Fictional monsters by species

Squigly

as Zombie/Revenant/Lich in Fictional monsters by species

Stitch's Cousins vs. Leroy Army

as Alien in Fictional monsters by species

Orbulon

as Alien in Fictional monsters by species

Eda Clawthorne

as Harpy in Fictional monsters by species

Micheal Jackson

as Werecat in Fictional monsters by species

Bill Murray

as Church in The Worst Horror Movie

Nosferatu

as Count Orlock in The Worst Horror Movie

Double (Skullgirls)

as The Nun in The Worst Horror Movie

Sharknado

as Bruce in The Worst Horror Movie

Miss Kitty (Monkeybone)

as Church in The Worst Horror Movie

Gorefield

as Church in The Worst Horror Movie

Purugly

as Church in The Worst Horror Movie

Alolan Raichu

as The REAL Main Villain in The Worst Christmas Movie

Golden (Huntrix song)

as Annoying Soundtrack in The Worst Christmas Movie

Big Billy / Williams Williams (PowerPuff Girls)

as World's Weirdest Cameo in The Worst Christmas Movie

Buck Cluck

as The Father in The Worst Christmas Movie

Baby Waluigi

as The Main Character in The Worst Christmas Movie

Maverick Trevillian

as Satan's Henchman in The Worst Christmas Movie

Gary Glitter

as The Controversial Figure in The Worst Christmas Movie