"Hey little guy, it's O.K. if you have to cry!"
—Ollie Bulb, Death screen
Ollie Bulb is a large anthropomorphic onion with blushing cheeks and a round purple nose.
Ollie Bulb is shown to be obstreperous when he cries uncontrollably while fighting Cuphead and Mugman, which means he is either really scared, or just really upset. He might not even be trying to hurt the brothers at all, considering that he only cries, but doesn't try to attack them. He is also the only boss besides Grim Matchstick that does not outright mock the duo or talk about their own strengths or egos in a game over.
BattleAfter Sal Spudder is defeated, Ollie will rise out of the soil in the middle of the area and shakes the dirt off from his nose. Upon looking around the area with a worried expression, he will begin to wail.
Unlike Chauncey Chantenay, players can inadvertently be damaged if they touch him. Ollie Bulb's only attack is to cry out water streams on both sides, which rain down tears randomly across the area. Some of those tears can be parried. In Expert mode, the tears drop quicker and there will be more falling down each time he cries. In Simple mode, Ollie Bulb doesn't appear in the fight.
Upon defeated, Ollie will constantly start pushing his cheeks with both hands with several strips of his onion skin peeled down while sinking to the ground.
In the version 1.2.0, if the player avoids firing at Ollie Bulb upon his arrival, Ollie will look around in fear before realizing the players mean no harm, burrowing away while smiling at the player. This action will cause Radish to emerge in his place in Chauncey Chantenay's phase. Sparing Ollie Bulb will also cause the Progress Bar (if you die) to have a question mark in the center.
- Ollie's attack, and personality is a reference to the fact that onions release chemicals into the air when cut open that can sometimes cause people to tear up.
- Ollie seems to have similarities to Jerome "Curly" Howard of the Three Stooges mostly because of how child-like Ollie Bulb is.
- Prior to the 1.2 update, various sprites and animations were left unused. As of the update, many unused features were added, including Radish after the secret phase.
- This is the only boss that the player can spare.