Throughout her appearances, she seems very confident and headstrong. According to Bebe Stevens, Nelly would never let the boys see the list, so it can be assumed she is trustworthy, at least to the other girls. She also seems to be one of their leaders during the Gender War, pitting her directly against the Wieners Out movement. Judging from Butters's injuries, Nelly is able to fight, and she noticeably does not flinch when he tries to attack her. Her ability to fight is strong.