Susan was a minor character in Divergent. It is shown that she and Caleb Prior have a minor crush on each other. She stayed in Abnegation, however, her ultimate fate is unknown at the end of the book.
Susan appears in Insurgent, where it is revealed that she chose to remain in Abnegation and survived the events at the end of Divergent. She goes to Amity with several other characters and helps them. Later, her relationship with Caleb is developed further. After she and the other characters escaped from the Amity land back to the city, she rejoins with the rest of Abnegation. Susan also helps the remaining Abnegation, and stays with the Factionless instead of going onto Candor.
She appears briefly, talking to her brother, Robert.
Susan has blonde hair and a mole right above her left eyebrow. She has a square jaw. She is said to resemble Tris Prior.
Robert Black is Susan's brother who was raised in Abnegation, but later switched to Amity, as he was seen on the Amity trucks later in Divergent. At the beginning of the book, Divergent, Robert and Tris exchange glances when Caleb flirts with Susan in an Abnegation way.