"I chew 'em up and spit 'em out."
—Sargent Gumbo Gumbull, Death Screen
He is a devious-looking anthropomorphic gumball machine sported scampering red legs with brown shoes. He has a red nose, a glass head, green eyebrows, a green body with a blue switcher, and a blue cap that resembles a hat.
Sargent Gumbo Gumbull's death screen suggests that he has a habit of talking tough.
Sargent Gumbo Gumbull will be selected randomly by Baroness Von Bon Bon for the first phase of the boss battle. Upon summoned, he runs around the arena and shoots gumballs up in the air as they rain down on the players. In Simple mode, he scrambles across the entire arena but won't fire gumballs. In Expert mode, the gumballs rain down faster.
When defeated, his head will shatter apart and his body will scramble away to the left of the stage.
- Sargent Gumbo Gumbull vaguely resembles the character Benson from the Cartoon Network series Regular Show, minus the lack of arms, and color scheme.
- Like the rest of Baroness' subjects, Sargent Gumbo Gumbull's name is not canon but rather a pet name given by the animator Tina Nawrocki in her Twitter post when asked by a fan.
- If Sargent Gumbo Gumbull is facing to the right when defeated, he will scramble to the end of the screen, then turn back to the left and retreat.