Surge is an anthropomorphic tenrec of average height, being about as tall as Sonic the Hedgehog. She possesses mostly bright green fur with a patch of black fur on her face and eyelids and angular blue-green eyes. She has a peach muzzle with a medium-long black nose, upturned sideburns on each side of her head, Surge possesses Sonic's indomitable and free spirit, albeit in a twisted and sinister way. She is a roguish speedster with an arrogant, cocky, and hot-tempered disposition.