OB-Wan, that greatest of the them all?
In my opinion he is the greatest of them all, I think his devotion to the Jedi order and Republic is second to none.
He managed to take on Maul, Grevious, Anakin and Vader ( albeit he sacraficed himself) and still came back as a spiritual guide to help Luke.
He has fought in all the major wars ( Naboo, Clone wars ) and contributed towards helping Luke destroy the first Deathstar.
He has also got and incredible balance with the Force, very proactive yet still subtle in his ways.
Do you agree or have I overlooked someone else?