Emily,
I definitely agree with your assertion of Stacy and Wallace as Campbellian mentors to Scott throughout his journey. Campbell notes that “what such a figure represents is the benign, protecting power of destiny” (Campbell 71). This notion definitely comes into play during the fight scenes themselves, which either Stacy or Wallace are typically present for. For example, they make comments that prompt Scott’s defeat of Matthew Patel, and Wallace is the one to provide the skateboard that leads to Lucas Lee’s downfall. It is also interesting to note that Campbell identified two common types of “mentors,” which are the “little old crone or old man,” or “the helpful crone and fairy godmother” (Campbell 69, 71). Scott Pilgrim vs. the World puts an almost comic spin on these two types of mentors, as the “old man” is merely a few years older than Scott, but seemingly much wiser, and the “fairy godmother” is a younger sister who has an almost supernatural insight into Scott’s thoughts and actions. The combination of the two provide a modern version of Campbell’s “supernatural aid” that is more appropriate for such a recent film (Campbell 69).