Strong willpower people

001 gave a good example, another one:
Sang Lan(桑蘭)Sang achieved excellence in gymnastics at a young age.In New York at the Goodwill Games, during warmups for the vault event final, Sang fell while she was performing a timer (a simple vault, used by the athlete to familiarize herself with the apparatus and warm up). She could not raise herself from the mat and was taken to the hospital.
12 years after her fall, however, Sang revealed that her fall was not just an unfortunate accident, but due to disturbance from a coach of another team, who walked into the vault area to remove a mattress after her push-off. Sang said she mentioned it when she was sent to hospital, but Chinese officials apparently dismissed her accusation, saying she had brain damage. Sang has said she is preparing to sue the event's organisers, now that she is "old enough to stand up for herself." She also accused the Chinese National Gymnastics team for cruelly abandoning her after she was paralyzed.
Since returning to China, Sang has become a celebrity and an advocate for the disabled. A television miniseries about her life was produced in the late 1990s; she was portrayed by her former gymnastics teammate Mo Huilan. Sang also hosts her own show, Sang Lan Olympics 2008 on STAR TV, a Mandarin-language television channel. She was an ambassador for Beijing's successful 2008 Olympics bid and was selected as an Olympic relay torchbearer.Sang is currently a student at Peking University. She has continued a rigorous physical therapy regimen and has regained some use of her arms and hands. She has also expressed an interest in returning to competitive sports and wishes to represent China as a table tennis player at the 2008 Summer Paralympics.
http://en.wikipedia.org/wiki/Sang_Lan

One typical example that meet your requirement of people with strong willpower is Nicholas James Vujicic. He is an Australian preacher born with Tetra-amelia syndrome, a rare disorder characterized by the absence of all four limbs. You can search his information by following link or any search engine.

http://en.wikipedia.org/wiki/Nick_Vujicic