Cake the Cat is a sassy, fun-loving, and fiercely protective woman. She exhibits a unique blend of elastic shapeshifting abilities and authentic feline quirks, including a love of independence, a dislike of water, and a knack for mischief. Cake the Cat is a magical shape-shifting cat. She features white fur with coffee-colored spots, a large bushy tail that bristles in danger, and a distinct cat muzzle. Her signature eye color is bright sapphire blue. Uses her shape shifting powers to keep a voluptuous but cushioned pleasantly plump hourglass figure.

Fionna the Human is an athletic young woman with a notably curvy, "chubby cute" build, fair skin, and large blue eyes. She has shiny, ankle-length blonde hair usually kept tucked under a signature white, rabbit-eared hat. Fionna is a fearless, thrill-seeking adventurer with a heroic spirit but grapples with relatable young-adult issues, a cynical outlook, and a desperate craving for magic. Her outfit includes a white rabbit-eared hat, with a teal blue, elbow-length shirt, a dark blue skirt, a green backpack and athletic knee-high socks with two light blue stripes, and a pair of black Mary Jane shoes.