As of currently, Onyx is a black bear with a red tongue, with a greyish green and red markings on her fur across her face, chest, body, legs, and paws with a neat black and red collar with a red bow on her neck.
She has a support animal friend named Luck. She will not go with her owner if Katie wouldn't include Luck too. She protects Katie and Luck from any harm or danger. She is also Katie's most best first pet since she has powers. She loves Katie but not as the same as Buds.