Ghandi would be the most powerful GL user ever. This man sat there and told his followers to get bludgeoned to shit, and didn't do anything about it. That is some badass willpower.
Hitler would be a tough mofo too, coming from a poor family, he used just his charisma and willpower to take over Germany, and completely revamp it from a piss poor country to a world wide super power. Then again, he was as crazy as a bat, so he'd probably end up like parallax.
Anyone with a lot of willpower would rule hardcore with a GL ring.
real life person?..... how about that guy that did the McDonald's documentary.... "Super-size Me"... if he can force himself to eat nothing but McDonald's he must have pretty decent willpower...... Decathlete's have a crapload of willpower.... plus the physical fitness would help too
William Wallace from that Documentary "Braveheart".... 馃槃