The Sugar Cube is a Candy Person who appears in many crowds. In "Power Animal," he is at the Northern Lights Rooftop Party, and he attends Couples Only Movie Night with his girlfriend in "Go With Me." In "Too Young," he donates part of his head to make Princess Bubblegum old again. He also makes a cameo as one of the passengers on the train in "Candy Streets." His first speaking appearance is in "A Glitch is a Glitch," in which he tells Finn to stay away from him moments before the glitch dissolves him.
Sugar Cube has four faces (one on each side except the top and bottom) and wears a cowboy hat and boots. His body is a typical sugar cube, and he also has sparkles on each side.
No, get away from me! [...] I saw what happened when you picked up Todd.
- Sugar Cube's girlfriend is a Purple Candy Guava.
- His gender-swapped version appears at the Biennial Gumball Ball.
- Strangely, she does not appear in the opening sequence of "Fionna and Cake"; her male counterpart appears in her place.