Sonic Boom is fast. Good luck telling what she looks like when she is in motion. She also typically wears a silvery suit and helmet when moving at speed.

When she stops her motion and removes her helmet, she has a feline appearance. Short, light tan hair covers her face and the front of her torso, and she has a short, black mane of hair that narrows to a point near her shoulders. Her canine teeth are larger and pointier than a human's, and her amber eyes look like that of a large cat's. The hair on the rest of her body is a little longer than the front of her torso (generally a couple inches) and is caramel in coloration. Her nose is short and upturned, and is jet-black in color. Short whiskers extend from her face on either side of her nose.