I thought you might want to see some of the more interesting ones I’ve come across, but if you want one then be quick; they tend to go fast, but can be on the expensive side.
Action Figure Barbecue: The Dawn of 31 Days of Toy Terror: Snakebite from Super Naturals by Tonka
Question about GxK… : r/Monsterverse
The Coolest Custom Action Figures That You Didn't Know Existed - Horror DNA
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Creature Features: Looking Back on Stan Winston's Attempts to Bring Original Monsters to Toy Shelves - Bloody Disgusting
Custom Horror Figures – LB 3D Design
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The Coolest Custom Action Figures That You Didn't Know Existed - Horror DNA
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Vintage 1987 Tonka Super Natural Skull Hologram Action Figure. Evil Warrior Leader