Main Character Problem
the source of the Main Character's motivation; the source of the Main Character's problems
Every character is driven by something--some deep-seeded problem that defines who they are and motivates their every move.
In every Main Character there exists some inequity that is driving him. If the Main Character Changes something in himself at the leap of faith, it is this item, his Problem, which he changes by exchanging it for his Solution. If the Main Character is Steadfast, though, he holds onto his problem, deepening his resolve to keep the same motivations through the end of the story as he had when he began the story.