Alison DiLaurentis

Alison DiLaurentis is a main character in the series and the best friend of Hanna, Aria, Spencer, and Emily. She was the queen bee of Rosewood before mysteriously disappearing only to be found three years later (one year later in the television series).

Physical Appearance
In the book, Alison is described as beautiful, with a heart-shaped face framed by long blonde waves and big blue eyes.

Book Series
Alison tries to hypnotize her friends to tell them their deepest secrets, but the girls are hesitant and finally agree. During the hypnotization, Spencer stops the process and gets angry at Alison. Alison storms off after Spencer insults her and disappears, later to be revealed to be killed by Ian, Spencer's sister's boyfriend who Alison was dating on the side. Her friends part. Three years later, Alison's body is discovered while the St. Germains, who bought the Dilaurentis' house, are digging to make room for their tennis court. Before her disappearance, Alison knew all four of the girls' secrets: Aria's father was cheating on her mother, Emily was a closeted lesbian, Spencer kissed her sister's boyfriend, and Hanna is a bulimic. The girls, Hanna, Spencer, Aria, and Emily, initially think that "A" is Alison, but after her body is found, they're confused.It's later reavling that ali had an twin who was impersoning her and Ali mad that her life was ruined killed her sister.

Television Series
In the series, Alison is portrayed by Sasha Pieterse. She mostly appears in the flashback the girls have of her.

Friends
Alison is the ring-leader of her group of friends, which consist of Hanna, Aria, Spencer, and Emily. Alison disliked Mona Vanderwaal, who her friends constantly made fun of. Alison treats Hanna like her lackey and Emily is hinted to be more than a friend.