Three legged, one leg with a hoof, one leg with a foot, and one leg with a birds foot. Three arms, one with a hand, one with a flipper, and one with a paw. Four eyes, one humanoid, one snakelike, one feline, one birdlike. About as tall as a Halfling. With hair, or without. Has male genitalia, or female, or both, or none. Body is a sphere, or a cone, or a rectangle. It has three ears, one humanoid, one catlike, one doglike. It doesn't have a mouth, but rather communicates through using sounds from its three noses. One nose is humanoid, one resembles a small elephants trunk, the third a pigs snout. It's natural colouring is Stewart Tartan.
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Or whatever the DM decides.