Hanna Marin

Hanna is the “It” girl of the group, quick to take Alison’s place as the most popular girl at Rosewood High School. When she was still part of Alison’s posse, she was teased mercilessly by Alison for being overweight. She later met up with an unpopular outsider named Mona, and together the two managed to make themselves skinny and gorgeous over the summer after Alison’s disappearance. Despite her popularity, Hanna is generous, caring and the most trusting and gullible of the Liars. She is known for being bold, fashionable, sarcastic and loving. Hanna seems to be the first to know about her friend’s secrets and relationships, and was the first to be “visited” by Alison.
http://www.wetpaint.com/pretty-little-liars/hanna-marin

Aria Montgomery

The “artsy girl” of the group, Aria moved back to Rosewood with her mother Ella, father Byron, and younger brother Mike after a year of living in Iceland following Alison’s disappearance.  She has returned a changed and mature young woman, slowly reconnecting with her old high school friends.  Upon her return she embarked on a long-term, complicated relationship with Ezra, whom she finds out is her new English teacher, Mr. Fitz, after a brief hook-up in a bar bathroom. She has had the least amount of harassment from “A”, possibly because she and Alison had a neutral relationship. Aria is fascinated with earthen and gothic styles, has an alternative fashion sense and of the four Liars, is the darkest, with the most secrets.

http://www.wetpaint.com/pretty-little-liars/aria-montgomery

Emily Fields

 
The talented star swimmer of Rosewood High School’s swim team, Emily had a complicated past relationship with former best friend Alison before she died. Although she struggled initially in coming out, her parents and mother especially have been accepting, and her relationship with Maya helped her to initially accept her sexuality. She and Paige had a brief relationship when Paige was still “in the closet”. Out of all the Liars, Emily’s parents have the most stable relationship, neither having cheated on the other before. She is the most sensitive of the girls and shows a great deal of compassion and empathy to people who are suspicious or outcasts. She was the second Liar to be “visited” by Alison, and came face-to-face with “A” in season two. 

http://www.wetpaint.com/pretty-little-liars/emily-fields

Pretty Little Liars

The program is about four friends who meet one year after her friend has disappeared. But then the four friends begin to be blackmailed by someone who calls himself A.