Colbey, from The Renshai Chronicles and the Renshai Cycle books.
Has the ability to read minds, is the best swordsman to live, at various times was and is a pirate, general, teacher, adviser, Strategist, Wizard, God. First seen trying to kill himself by walking into every local army he can find. He won, of course. Challanged the world and everything in it, outhought the wisest and oldest, and saved the world at least 3 distinct times.
Ahem. Not that I'd want all that right away. His personality, however, is contagious.
Second choice... Lu-Tze from Discworld. Making the world a better place, one small turtle at a time.