Sansa Stark O Alayne Stone

She is one of the main characters of the saga of Ice and Fire. In the first volumes she is known as Sansa of the house Stark but then she becomes Alayne Stone, the natural daughter of Petyr Baelish.
In the TV series she turns out to be an exasperating character, in the book she proves to be a strong but silent character, much smarter than in the series and less whiny xD