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Big Bull Demon is a cyborg demon with a buff body and light blue skin, along with blue and black robotic parts. He has a drill for one of his hands and has a brain capsule on his head, similar to the one Darrell has. The compartment has three spikes that pop out of it, one on the top, and two on the sides, which create his ears to flop down. His lower jaw seems to be robotic and is very long, holding very sharp teeth.
- "You Have to Care"
- "Villains' Night Out"
- "Mystery Science Fair 201X" (cameo)
- "Plaza Shorts" ("Action News")
- "Let's Not Be Skeletons"
- This character is an OC created by the character designer, Julia Srednicki, who named it, "Cyborg Demon Soldier Overlord." But they decided to change his name to "Big Bull Demon", as shown in "Villains' Night Out."