I would have to say Luke. He started his Jedi training at a late age, some thing the Jedi Order frown upon. What took most Jedi to learn in a life time only took Luke a few years to accomplish. The only Jedi that I know who purposely fell to the dark side and was fully redeemed.
IMO, I always looked at Luke as the Chosen One. Without Luke, Vader never would have killed the Emperor.
Sh‚sotjontŻ ch‚tsatul nu tyŻk.
TyŻkjontŻ ch‚tsatul nu midwan.
MidwanjontŻ ch‚tsatul nu asha.
AshajontŻ kotswinot itsu nuyak.
Wonoksh Qy‚sik nun.