The youngest child of Henry and Kataerina Lannister. She likes to get her own way, and often does. Her Father spoils her terribly, balanced in part by her Mother. While she will use her charm and quick mind to get what she wants, she will never play her parents off against each other. To say previous attempts to manipulate her mother in this regard were unsuccessful would be a monumental understatement.
She gets along well with all her brothers to one degree or another. She is closest to Stephyn as they share a taste for the finer things in life. She likes William’s easy going nature, even if he tends to be muddy and sweaty all the time from constantly training to be a Knight. She and Kyle have a friendly but distant relationship. He always seems to know when she’s doing something she isn’t supposed to, but rarely tells. To her frustration, on the few occasions he has, she was unable to convince him otherwise.
It has been noted that Rosamund bears a resemblance to Princess Myrcella Baratheon.