Red Hood (Jason Todd)
Starfire (New 52)
Captain Marvel (formerly Ms. Marvel; Carol Danvers)
Round 1: Randon encounter. Everyone has standard gear (no plot device gear). The fight takes place on in and around an abandoned factory. No "jobber" aura around any character :)
Round 2: Same rules and location but both sides get 3 days to prep. No help from outside sources or people.