When Esme first arrived in Port Charles with her boyfriend, Spencer, she seemed like just a spoiled young rich woman. As time went on, she was revealed to be seriously disturbed. She did a number of terrible crimes to young Trina, Josslyn and Cameron out of jealousy and spite. Later, we found out that Esme murdered her adopted parents and that her biological parents are killers Ryan Chamberlain and Heather Webber. She worked with Ryan for months to put his plans of murder and revenge into action.
Esme lost Spencer because he fell in love with Trina, and he found out that she targeted Trina and his other friends. She then slept with his father, Nikolas, and got pregnant. Not wanting a psycho to raise his son, Nikolas kept her locked away in a tower of Wyndemere. However, she escaped and was rescued. She claimed to have amnesia, which made her a nicer person. She was still put in jail for her crimes, but Ryan and Heather escaped with her. They were captured and Esme had her baby. It’s unclear whether she really has amnesia or not, and whether she can be redeemed. She’s very similar to another character, Nelle, who also caused a lot of havoc in town.