How about James "Rube" Parnham - guy was a monster in the International League - 22 wins in 1918, 28 wins in 1919, and 33 wins in 1923. Was a total nutcase, disappearing between starts, auto accidents and constantly being suspended. Was called "dumbest man off the field – and the smartest on." I'd say he earned his "Rube"!
Circa 1919 press photo:
rube_parnham.jpg