I Brienne! Brienne of Tarth: "Galladon drowned when I was four and he was eight, though, and Alysanne and Arianne died still in the cradle. I am the only child the gods let him keep. The freakish one, not fit to be a son or daughter.
I like how Brienne tries to convince herself of this throughout the books even as she recounts how deeply she has been wounded by words and speaks some of the most powerful words in the series, literally convincing Jaime not to die.