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, taking great pride in her prowess and bragging at any given opportunity. She is also fearless and bold, rarely showing any form of worry or concern, even in situations that are troublesome or possibly beyond her capabilities. When push comes to shove, however, she tends to give in to anger, causing her to become a more volatile force.

Like Sonic, Surge shows a great deal of attitude when facing off against foes, namely by taunting and mocking them. However, this is out of mean-spirited arrogance and malice as opposed to the carefree playfulness Sonic demonstrates. She is likewise brash, careless, and impatient, which are qualities that stem from her explosive temperament and sense of superiority, unlike Sonic, whose same qualities stem from his positive attitude and confidence.