Lifeguard technically qualifies as one of the X-Men by being one of the 'X-Treme' X-Men of the early 2000's. A comic that I loved, but that I guess is fairly indicative of it's time. Heather Cameron was an Australian (like me!) lifeguard, who developed the mutant power to manifest any ability needed to save a life. In practice that mostly meant transforming into golden armor, like Colossus, and growing golden metal wings that allowed her to fly.
