The official name for this one is Clumsy Guy, but everyone I know calls him Guy with Crutches. It’s not often that we see injured Minifigures. They can take a lot before they get hurt, so this one must have one big story to tell.
Clumsy Guy from the LEGO Minifigures series 15 appears in these sets:
71011 Minifigure, Series 15 (Complete Series of 16 Complete Minifigure Sets) (2016)