My favorite ficitional character would be Miles Naismith Vorkosigan.
He is born damaged by a chemical attack on his mother. He never will reach normal adult height, and suffers from extremely brittle bones. Although born into the "Vor" aristocracy, he doesn't fit the mold of this warrior caste, and he is the constant target of scorn from his countrymen. It is commonly believed that his rise in power and position is only due to nepotism...but actually he is a fiendishly clever secret agent working for the Department of Internal Security. <3