Reason 1: Rock Lee never gives up. The odds are definitely stacked against him, being someone who couldn't use ninjutsu or or genjutsu like all of his classmates. Everyone told him he should quit, and at the academy, he was barely able to keep up. Then, when he was on Gai's team, Neji kept telling him he was not worth his time. He was injured so badly for a while they thought he would never fight again. Nothing stopped him from getting up and trying again until he made it to the top.