Some nicknames of famous athletes include:
George Gervin (basketball player) = "The Iceman"
Karl Malone (basketball player) = "The Mailman"
Reggie Jackson (baseball player) = "Mr. October"
Walter Payton (football player) = "Sweetness"
William Perry (football player) = "The Refrigerator"
Wayne Gretzky (hockey player) = "The Great One"
Mark Allen (triathlete) = "[The] Zen Master", "The Grip"
O.D. Wilson (powerlifter/strongman) = "Nightmare"
Kirk Karowski (powerlifter) = "Captain Kirk"
Westside Barbell's Dave Tate had an alter-ego, "Zippy", that he would slip into before challenging training sessions. Apparently, he eventually let Zippy go because he would find himself pushing to the point of injury, but the idea is a sound one. Giving/earning yourself a label can help push you through difficult periods. Imagine yourself as "The Technician" and, very likely, you will focus attention on your form and it will improve. Call yourself "The Zen Master" and you might find a greater sense of calm and pain tolerance.
Just for fun, Lee's Useless Super-Hero Generator can set you on the path to glory if you can't come up with ideas.