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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.
Despite enjoying slow song karaoke he’s a tough mean fighting machine. He has a gruff strong personality ready to take down any hero who stands in his way.
|93. "We Are Heroes":||Absent||103. "Big Reveal":||Absent|
|94. "KO, Rad, and Enid!":||Absent||104. "Radical Rescue":||Absent|
|95. "Let's Meet Sonic":||Absent||105. "You're a Good Friend, KO":||Mentioned|
|96. "TKO Rules!":||Absent||106. "Let's Get Shadowy":||Absent|
|97. "K.O. vs. Fink":||Absent||107. "Red Action 3: Grudgement Day":||Absent|
|98. "Chip's Damage":||Absent||108. "Carl":||Absent|
|99. "The K.O. Trap":||Absent||109. "Dendy's Video Channel":||Absent|
|100. "Whatever Happened to... Rippy Roo?":||Pictured||110/111. "Let's Fight to the End":||Appears|
|101. "Planet X":||Absent||112. "Thank You for Watching the Show":||Appears|
|102. "Deep Space Vacation":||Absent|
- 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".