BMO's famous signature look is the combination of Macintosh computer with Game Boy Color buttons and Atari 2600 controllers.
Beside all the cat features such as a snout, a fluffy tail, and ears, Cake also has white fur interspersed with coffee colored spots.
Finn the Human costume is a blue T-shirt with denim shorts and rolled-down white socks with a pair of black shoes, and most importantly, he has a two-ears white hat on.
Fionna costume is a blue T-shirt with denim mini skirt and thigh high white socks with a pair of black shoes, and most importantly, she has a feminized two-ears white hat on with her blond hair shown off.
Flame Princess costume is a dark orange gown with an orange jewel on her chest as well as on forehead. She also owns a fire-like hair style to emphasize her element.
Gunter's signature appearance looks quite simple for it merely is a regular penguin. It has a black back and flippers with white belly, yellow beak and feet, and big black eyes.
Ice King costume is long white beard, a gold royal crown, and a long blue robe.
Ice Queen costume is a blue long sleeved princess gown with a pair of blue shoes, a gold necklace, and a tiara.
The audience tend to recognize from Jake the Dog oval body shape, as well as his yellow skin color.
Lumpy Space Princess' signature outfit is that of a floating purple cloud or cotton candy with a big yellow star on her forehead that glows when she floats.
Marshall's signature look is red plaid shirt with denim pants and red sneakers.
Marceline the Vampire queen signature style includes gray tank top, denim pants, red cowboy boots, while her appearance speaks of the vampire: pale skin, fangs, and bite marks.
Princess Bubblegum costume is a long pink hair and wears a long pink princess gown with her signature tiara.