I was just thinking of characters who are able to grow far beyond their original character description and become breakout stars of their campaigns and a blast to have in the party.
My best is probably Teyth'andraskahar, Warforged Factotum. I originally pitched the character for a one-shot as a half joking suggestion with a race and class combination which shouldn't even exist in pathfinder. I somehow convinced the GM to allow it and Tayth became an escaped experiment from an ancient and forgotten civilization. His creators had tried to make a suer-soldier who could do everything and had tried to imprint all human knowledge into him. They believed that their experiment had failed utterly, but they had in fact created a first level factotum. He now wanders the world searching for his purpose. The one shot proved so popular that "The Continuing Adventures of Raegar and Tayth" has had a sequal and the completion of the trilogy is planned.
What are some other stories of characters that have proven to be breakout stars of their campaigns.