Cubchoo resembles a baby polar bear. The top half of its body is covered in light-blue fur, while its lower half is white. It has black oval-shaped eyes, round ears, small, stubby paws and feet, and a round white tail. Cubchoo's muzzle is a deeper shade of blue, and it has a large, round black nose with a thick droplet of partially frozen mucus dripping down like an icicle.
Cubchoo's nose is always running; when it sniffs the snot back up into its nose the mucus provides it with the energy it needs to use its Ice-type attacks in battle. When this Pokémon is sick, its mucus becomes watery, causing the power of its moves to decrease.