Alison Lauren DiLaurentis, also known as Ali, is also the main antagonist for Pretty Little Liars novels. She is different from her courterpart in the TV series that is just a narcissistic bully, she is the book version, is a cruel serial killer.
Alison DiLaurentis is a cruel bully who lied to anyone who wanted to search, she sought to treat Aria, Emily, Hanna and Spencer specially. Alison was not only a very manipulative and a bully, she also had the title of ''Queen of Bee'' of Rosewood and popular girl, making others very envious. However, secretely without anyone knowing, that Alison was going from Courtney to her twin sister, she also killed her trying to seek Nick Maxwell's help, after which Alisson was arrested.