Aria is the artistic rebel of the liars who moves back to Rosewood with her family after spending a year in Iceland after Alison went missing. She has returned a mature, changed, insightful young woman who slowly reconnects with her old friends.
Undercover as Lovers: Aria and Holden pretended to be dating in front of their parents during season two, so she could see Ezra and he could go to fight club.
You Gotta Have Pink Hair: She had a streaks of pink hair before the series begin, but removes it after returning from Iceland.
(Ashley Benson)"Sometimes telling the truth does more harm than good."
Fool me once, shame on you. And fool my best friend, youíre dead-freaking-meat
Hanna is the "It Girl" of the group. After Alison's disappearance, she distances herself from the other girls and becomes best friends with another unpopular outsider named Mona. They managed to make themselves popular over the summer by becoming gorgeous and skinny. Hanna takes Alison's place as the most popular girl at Rosewood High School in her absence and wins 'Homecoming Queen'. She does everything for her loved ones and is the funny one of the bunch.
Or when A gets between her and Caleb, for that matter, driving her to an almost-obsessive search to unmask him/her in season 3 after Caleb discovers there's a second A, which is likely to get him in danger for knowing too much.
Big Damn Heroine: Charges headlong into a burning house to save Jenna, without even a second's hesitation.
Big Eater: Prior to Alison's disappearance, she was quite an eater; she even sneaked food between meals, at least until Alison discovered her.
Book Dumb Blonde: Yes, two-in-one. Although her grades aren't really bad, she has her dumb moments as well.
Heterosexual Life-Partners: With Mona, after Ali vanishes from the picture. They later grow apart, as Mona was revealed to be in the A Team, but their distance is bridged a little on the season4 premiere. It will probably never be what it was, though.
In-Series Nickname: "Hefty Hanna", by Alison, due to her being fat before Ali went missing. This is later picked up by A, much to her annoyance.
Lovable Alpha Bitch: Well, more like all Alpha and no Bitch (except for being tarred with Allison's "bitch" brush). She's at the top of Rosewood High's Popularity Food Chain, but she's nice to just about everyone.
Ms. Fanservice: Although she did have a few scenes, she hits the ground running on season 4. "Grave New World" in particular; Hanna's Halloween costume accentuated her cleavage a lot more than the rest of the girls, which the viewers indeed noticed.
You know what Ali said that night? About our secrets keeping us close? I think it was the opposite.
A classic overachiever, Spencer is confident, calculating, and could stand up to Alison when no one else could, showing her determination. However, Spencer begins to show a bit of strain when she and her friends begin receiving strange texts from the mysterious "A". She's the smart member of the group.
However, this is due to the fact that Toby betrayed her and is on the A-Team, not because of a simple break-up, so, it is somewhat justified.
The Unfavourite: When Spencer's parents are home they tend to neglect her in favour of Melissa.
(Shay Mitchell)"There's always more to a story than people think."
If lying was a crime we would all be in jail.
Emily is the star of Rosewood's swim team. She struggled with an on and off relationship with Alison, who at times would say things to put Emily at risk of being outed. Initially when Emily came out, her parents, especially her mother, struggled to handle the news, but now they seem to be accepting of her sexuality.
Adaptational Sexuality: In the books she was bisexual and ended up with a guy. In the series she is, except for a lackluster relationship with Ben before she figures herself out and a confused grief-induced kiss with Nathan, shown to be exclusivly attracted to women.
The Alcoholic: In Season 3, because of Maya's death. She eventually grows out of it though.
Ambiguously Brown: Though Emily's father is Asian in the show, implying that she's mixed race.
Bi the Way: AVERTED. Initially she's dating Ben but has feelings for Maya. She then came out of the closet, but Season 3 confirms she was just dealing with grief when she kissed Nathan. Averted by the Powers That Be who state that she is gay.
Took a Level in Badass: In the beginning, "A" considered her to be the weak link, and repeatedly referred to her as such. By season 4, she is in many ways the strongest of the Liars. Mona even lampshades it.
(Sasha Pieterse)"Friends share secrets. That's what keeps us close."
Two can only keep a secret if one of them is dead.
Alison was the "It Girl" and the Queen Bee of Rosewood High School until she mysteriously disappeared. One year after her disappearance, her body is found buried in the backyard of Maya St. Germain's house later confirmed to not be her, which used to be hers. However, she is constantly remembered in flashbacks and has also appeared to the Liars through dreams in the present day.
Asshole Victim: She might have been only 15 when she died though she's not actually dead, but she managed to make so many people hate her that just about every other supporting character in the show had a motive for her murder.
Chekhov's Skill: She learned how to hold her breath for extended amounts of time. Doing so allowed her to survive being buried alive.
The Corrupter: To the other four Liars. She gets Hanna to get into bulimia, for instance, and even assists Aria in trashing Byron's office and framing Meredith for it.
Cooldown Hug: Gives one to Hanna when she walks into her house and finds her finishing an extra meal, which prompts the girl to start crying because she couldn't stop herself from eating more and more.
Dead All Along: Remember when Ali was missing? Oh yeah, she was actually dead. Buried under her parent's gazebo since the night of her alleged "disappearance". Subverted as "Now You See Me, Now You Don't]]
Death Glare: According to her mother, she was an expert at it by age five.
Took a Level in Kindness: In her present day appearances at least. She seems much nicer compared to her flashback appearances.
The present appearances of her are only dreams. It's later confirmed they're not.
(Janel Parrish)"It's easier to forgive an enemy, than it is to forgive a friend."
Iíll shake people down ó I love doing that.
A former loser who was tormented by Alison (yet still diolized her), Mona and Hanna became really close friends after Ali goes missing, and become the top popular girls of Rosewood High. She's witty and can be mean at times, but treats Hanna like a sister and seems to get along with the other Liars as well. The second season finale reveals that she's A, and she's sent to an asylum after being diagnosed as insane. She returns to school after "getting better" in the second half of season 3, but continues working with the second A all along, until she's betrayed in the season finale and almost burnt alive with the Liars. She is promoted to main character status on the fourth season.
Adaptation Expansion: In the original book series, Mona dies when she tries to kill Spencer. While the same scene happens in the Season 2 finale, she manages to survive. Everything from that moment onwards has been created exclusively for the TV series.
Ascended Extra: Her role wasn't that influential on the first season, but she gradually starts gaining more importance as from the second season onwards.
And on season 4, she becomes a main character.
Big Bad: For the first two seasons, though none of us know this until the end of the latter. In Season 3, she becomes The Dragon, while pretending to have reformed, until she's expelled from the A Team in the finale. As of Season 4, she's alligned with the Liars in order to bring down whoever is behind it all ... apparently. It could go either way with this girl.
Bitch in Sheep's Clothing: Zig-Zagged in regards to Hanna: On the one hand, she used her friendship with Hanna to gain inside info on the girls, making her more effective as A. On the other hand, she seems to truly care what happens to Hanna.
Darker and Edgier: As the series progresses, her character becomes much darker than the light-headed girl in the beginning.
Deadpan Snarker: Now that she's been revealed as A, she indulges in this on occasion.
Spencer: "If you so much as touch one hair on their heads, I will make you very sorry!"
Mona: (smirking) "Looks like someone's been skipping her anger management classes."
Deal with the Devil: Invoked. She describes her arrangement with the true A as this. Basically, she became The Dragon and gave control of the A-team over to the true A and in exchange, the true A arranged free passage in and out of Radley for her. Now, whether or not she was telling the truth about that is open to interpretation.
Heel-Face Turn: She's trying to convince Rosewood that she's made one, but "Mona-Mania" confirms that she is definitely still on A's side.
She makes one for real in "A dangerous gAme".
Heterosexual Life-Partners: With Hanna, after Ali vanishes from the picture. They later grow apart, as Mona was revealed to be in the A Team, but their distance is bridged a little on the season 4 premiere. It will probably never be what it was, though.
It Meant Something to Me: Despite having used her position as Hanna's best friend to help her attack the girls as "A", she tells Hanna this in the Season 4 premiere:
Mona: I really did love you... (Beat) and I really was your friend.
Meganekko: In flashbacks. For some reason, after she became popular she stopped using glasses (presumably for popularity). It's possible she got contacts though...
Might As Well Not Be In The Asylum At All: During her stint in the Radley Sanitorium, she continues to act on instructions from the A-team and communicate with them. She even manages to leave for a night in "This Is A Dark Ride."
Took a Level in Jerkass: After Alison's disappearance, she reinvented herself from the quiet, mousy girl she was into a new It Girl, and total bitch. She even adopted Alison's insult for Lucas, "hermie".
"I guess weíre all going to have to just pitch in a little bit more around here."
I made a mistake, all right? And I will be sorry about it for the rest of my life.
Byron is Aria's father and a college professor at Hollis. Shortly after Alison's disappearance, he moves the family to Iceland for a year as a sabbatical. He had an affair with a student prior to the moving, and was discovered by Aria and Alison. It's the first secret A uses against Aria and the Liars, threatening to expose it to Ella.
Also, he divorces Ella in the six months timeskip between seasons two and three.
Overprotective Dad: Particularly after learning of Aria and Ezra, going as far as to telling Aria to change her outfits for school because he's concerned about "who she could be dressing for" (and Ezra didn't even work at the school anymore at the time).
Red Herring: After his blackmail at the hands of Alison was revealed, he's treated as the main suspect both in canon and fanon. While it hasn't been 100% proven, Aria and the fanbase seems convinced he isn't the murderer.
"People aren't dolls. You can't just play with them and put them back in the box."
I haven't been on a date since George Clooney has been on E.R.
Aria's mother and Byron's wife (later ex-wife), who later becomes a substitute teacher in Rosewood High (and a full-time teacher after Ezra gives up the position). Ella believes in treating her children as friends, not as property. She has mentioned that she doesn't want to push into Aria's private life, and she thinks that Aria should be allowed to keep secrets.
Open Minded Parent: She is much more open than Byron, and has stated that she treats her children more like friends, not an authoritarian figure.
The best example is probably how she was more open to Ezra and Aria's relationship than Byron. She was shocked and mad, of course, but later (thanks to some Character Development of her own) comes to accept them, unlike Byron who gets Ezra fired instead.
Save Our Students: The reason why she completes Emily's test for her, despite it compromising her job.
Secret Relationship: After learning about his affair and leaving her house, Byron and her reconnect and start secretly seeing each other again.
Shipper on Deck: For Caleb/Aria, after seeing them talking really close. She also mistook a conversation between Spencer and Ezra as the two of them being in a secret relationship.
Ella has pretty much been founding the crack ships in the series by now.
If A knows, I'm thinking B and C and everybody else knows.
A new resident of Rosewood who is hired as literature teacher in Rosewood High at the beginning of the series. Ezra meets Aria in a bar shortly before classes begin and the two connect and make out, only to meet each other later as student and teacher in Rosewood.
"Bad boys got nothing on mean girls. Guys have a fight, thereís a punch itís over. Girls donít fight fair. They gang up, keep secrets, plot. They can cut you down with a look."
Itís kinda hot, knowing you think Iím capable of murder.
Noel is a popular jock and a student in Rosewood High. He has feelings for Aria and briefly dates her, ending things when he discovers that Aria is seeing Ezra. Noel attempts to blackmail Ezra with this information, but ends up getting framed by A (for apparently stealing mid-term exams) and gaining a suspension. In the second season, he returns when said suspension ends, and begins a romantic relationship with Mona.
All Love Is Unrequited: Calling it "love" would probably be taking it too far, but nevertheless he fits regarding his relationship with Aria.
"Sometimes what people believe is best for you is not really what's best for you."
I'm not gonna spend the rest of my life sitting in front of a TV.
Holden is a childhood friend of Aria's who hasn't seen her in a very long time. He has been living in Portugal with his family and returns to Rosewood halfway through season two. He's very sweet and caring towards Aria, but just as a friend. He loves martial arts and secretly practices it, despite having a heart condition that could cause his death if he's not to careful about it.
Undercover as Lovers: Aria and Holden pretended to be dating in front of their parents during season two, so she could see Ezra and he could go to a fight club.
"Listen, sweetie. I'm not in high school. You don't have a say in this."
You are in this class to discuss American history, not mine, got it?
Meredith is a former student at Hollis who had an affair with Aria's father prior to Alison's disappearance. She wished for Byron to leave his wife and be with her, but instead he broke the affair after Aria and Alison trashed his office, pretending to be Meredith and left for Iceland. In the third season, she becomes the history teacher of Rosewood High.
"t's all romance and sacrifice in your little Paris garret. Except you determine what's sacrificed, not him."
Everyone has motives.
Ezra's estranged mother, with who he parted ways when he came to Rosewood. She tracks him down in the third season, and is initially introduced as nice, but later we find out she's not as pleasant as she seemed to be. Dianne does not approve Ezra's relationship with Aria, and has warned her not to bring her son down after he's kicked out of Hollis.
Manipulative Bitch: Shown in how she bribed Maggie into getting an abortion, moved her out of town and had her raise her grandson in secret, keeping it from Ezra.
Missing Mom: Played with. Ezra hasn't seen her in seven years prior to season 3, but that was just because he didn't want to see her.
My Beloved Smother: Not only to Ezra, but to his brother Wesley as well. She expects highly from both of them, and since she does not like to be disappointed (as she has been with Ezra) she enforces her behaviour on Wes, supressing his true feelings and desires.
"When they find the maniac who did this to you, I will kill him. After I kill him, I will sue him."
It's only a felony if they find out.
Hanna's single mother, who works at a bank in Rosewood. She's a kind, wise woman and has a very good relationship with her daughter Hanna and her friends. Her ex-husband Tom, Hanna's father, left her and Rosewood prior to the beginning of the series. She also has a complicated relationship with the police, particularly with agent Wilden.
Out of Focus: When the second half of season three begins, Ashley is not seen, and Hanna is living with her grandmother instead. She shows up a couple of episodes later, but an explanation for her being missing is not provided.
"Knowing the right questions is better than having all the right answers."
The rich girls steal, the pretty girls lie, the smart girls play dumb, and the dumb girls spend their days trying to be all of the above.
Caleb is a street-smart new kid at Rosewood High, who has a checkered past and illegally hacked into computers for money when he first moved to Rosewood. He is found by Hanna and Aria living at the school because of troubles at his adoptive parents' house, which prompts Hanna to invite him to stay at her house, secretly, without letting Ashley know (although she eventually accepts him).
Genre Savvy: In "The Lady Killer", he adquires a gun and points out to the girls that they should realize the kind of people they were dealing with, the same people that killed Maya, and they shouldn't be taken lightly.
"Icebergs turn over. They just roll over and turn up all that buried junk. You don't want to get too close when that happens."
Girls like her don't approach guys like me unless they have deep seated self esteem issues and a serious drinking problem.
Lucas is a member of the yearbook committee who was tormented by Alison in the past. He becomes good friends with Hanna after the two work together on the yearbook and the prom and eventually develops a crush on her, but steps aside when she begins dating Caleb Rivers. On the third season, he makes a Face-Heel Turn and his character grows darker as the series continues.
Just Friends: With Hanna. It was used to hurt him and Hanna in a school dance episode, with A forcing Hanna to dance with him, which causes her boyfriend Sean to break up with her and to hurt Lucas as well.
"Your mom may be hot, Hanna, but sheís not hot enough to make that go away."
The evidence doesn't lie.
A police detective who arrests Hanna for shoplifting on the Pilot episode. Ashley begins a sexual relationship with him in return for him dropping all charges against Hanna. He is later put in charge of the investigation on Alison's murder.
Ambiguous Allegiance: Is he on the side of the law or his own? Or is he assisting A? It's hard to guess at times.
Dirty Cop: Darren uses some questionable methods while he is investigating the murder of Alison although he doesn't do anything that is actually illegal. After Hanna gets arrested for shoplifting her mom starts a relationship with Darren to keep Hanna from getting in trouble. Thankfully she kicks him out of the house eventually. He usually targets Hanna for interrogation and harassed Emily in one episode.
"Training a horse, it's an art. You have to bend its will until it knows you are its master. That's how you are gonna feel when I'm done with you. Welcome to the family, sis."
If someone messes with you, you should get to choose their punishment.
Hanna's soon-to-be step-sister. Kate is the daughter of Isabel Randall, Tom Marin's fiancee, who comes to live at Rosewood with him later on. She seems to be poised and well-brought-up, but eventually reveals her desire to make Hanna's life miserable.
I have a few other choice words I would reserve for Ian, but if I start listing them, Iíll never fall asleep.
Peter Hastings is the wealthy father of Spencer and Melissa Hastings. He is a successful attorney and is all about winning and being the best. He is the picture perfect husband and father who controls a seemingly picture perfect family.
Adaptation Dye-Job: Like in the case of his daughters, his book counterpart has blonde hair.
Your Cheating Heart: He had an affair with Jessica DiLaurentis many years ago, as well as a son with her. All while still being married to Veronica.
"Our family doesn't handle imperfection very well."
Like it or not, this is your family.
Veronica is Melissa and Spencer's mother. She is a well-educated woman and a caring mother for both girls (although, like her husband, tends to favor Melissa). She is a workaholic and is often out of the house. However, behind the perfect facade, she has her own flaws.
"I don't feel like I need to be the best and the first anymore. All those things that used to matter just... don't seem that important."
I've seen some stuff that makes you and your friends look pretty bad..
Melissa is Spencer Hastings' seemingly perfect older sister. Melissa has everything her sister has ever wanted. She was accepted to the Wharton School of Business with nothing but praise from her parents. What she doesn't already have, she's not afraid to take, such as the barn. The thing is, her boyfriends seem to be attracted to her younger sister instead.
"None of us are perfect, we all come with baggage."
One does not come unfortified to the house of Hastings.
Wren Kingston is the fiancťe of Melissa Hastings, who became attracted to Melissa's younger sister, Spencer, which causes the two of them to break up after she finds them making out. He is a physician who works in a hospital. He currently has a rotation at Rosewood Community Hospital, and also currently volunteers at Radley Sanitarium.
Nice Guy: In the first episode, when the Hastings parents show their clear favoritism for Melissa, Wren is genuinely nice to Spencer and reassures her. This is put in doubt on season 3, after Spencer hears some rumors at Radley that seem to indicate the contrary.
"You know what they say about quicksand, Spence. The more you struggle, the faster you sink. And you're sinking fast."
You know, you can't avoid me. I live in your backyard.
Melissa's ex boyfriend, who she later starts dating after breaking up with Wren. He had a brief relationship with Spencer before he broke with Melissa the first time, while she was still 15, something only Ali knew about. He is appointed the field hockey team's coach in early season 1.
"Different is good. I like different... this town has too much of the same."
I've got friends in all the wrong places, and misery loves company.
Toby is a troubled young man from Rosewood who lives near Emily's house. He's a shy, quiet boy who was framed by Ali for the prank that made Jenna Marshall lose her sight, and spent some time in juvie because of that. He quickly becomes the lead suspect in Alison's murder investigation, and is regarded as an evildoer by almost all Rosewood. He begins a romantic relationship with Spencer by the end of season 1.
Adaptation Expansion: He has a bigger role in the tv series, where he remains very much alive, unlike the book series.
All Girls Want Bad Boys: According to the people of Rosewood, at least, this fits her relationship with Spencer. And then we learn that he's on The A Team, which gives a whole new meaning to this.
Almost Kiss: With Alison in a flashback shown on the season 4 premiere episode; they're interrupted by his mother right before their lips touch.
Blackmail: The second A forces him to drop Mona's RV on the open in the season 4 premiere.
Undercover as Lovers: In "The Remains of the A" he accompanies Hanna to a dance as her date to "scare off a creep that wanted to date her", although it's actually due to a lie Hanna told Ashley and it was the first thing that came to her mind.
"I don't need a special flashlight to know what people around here are hiding. This school is filled with phonies and liars. They're everywhere."
I'm fascinated by the nature of evil.
Toby Cavanaugh's blind step-sister. She's a sly, smart young woman who had a very complicated rivalry with Alison after she turns down Ali's offer to join her group briefly after moving into town. The Liars accidentally caused her blindness in a prank intended for Toby that went horribly wrong. She does not approve of Toby's relationship with Spencer, but eventually Toby pushes her aside to be with Spencer.
Ambiguous Allegiance: It's pretty tough to tell what side of this whole mess Jenna lands on. Some fans have theorized that she's working with A, while others have suggested that she's actually A's enemy and will later work as an ally to the main characters. Really, it's anyone's guess.
Adaptation Expansion: Her role on the tv series is much larger than in the books. Plus, she's still alive, while her book counterpart isn't at this point.
Heel-Face Turn: Well... maybe. In "If These Dolls Could Talk", she claims that she no longer hates The Liars, having been moved by Hanna saving her life. However, she doesn't act much differently towards them.
Obfuscating Disability: As of "If These Dolls Could Talk", Jenna has recovered her eyesight and has been pretending to be blind. When confronted by the four main characters, she claimed she was doing it to protect herself from the person who tried to burn her alive in "Eye Of The Beholder".
She drops the act in "That Girl Is Poison" though.
Put on a Bus: After "This is a Dark Ride" she is not seen again. It is later mentioned that she changed schools.
The Bus Came Back: She does return, finally, in "A DAngerous GAme". An explanation for her absense is not provided, though.
"Emily, I still don't understand, but I love you. You're my child, and nobody hurts my child."
Don't take on a tragedy that has nothing to do with you.
Pam is Emily's mother. She is usually very supportive of Emily's decisions, except when it came to Emily's sexuality early on in the series. At first she disapproved of Emily's sexuality but she eventually came to terms with it, and accepted Emily for who she is.
"I admit I like to live life in the grey area, but the way I feel about you is crystal clear..."
So I'm corrupting you. You okay with that?
A new resident of Rosewood whose family has just moved into the house that used to belong to the DiLaurentis family. She and Emily began to bond, and the two soon began to develop romantic feelings for each other.
Adaptation Expansion: Her character was given much more relevance than her book counterpart, which was more of a supporting character.
Paige is a talented swimmer and a member of the Rosewood High School's swim team. In the absence of Emily Fields, Paige had become the top dog of the swim team and was aiming to become the swim team captain. When Emily came back, she felt threatened. She was up against Emily for the Anchor Leg and tried to sabotage Emily via intimidation. However, soon after, Paige comes out as a lesbian to Emily, her long time crush.
Action Girl: She can definitely hold her own in a fight. She was able to save Spencer from the person in the Queen of Hearts costume by beating said person up.
Armoured Closet Gay: Was this when she was first introduced, but eventually came out in season 2.
In Season 3, it's revealed that this is because Alison actively made her think being gay was something to be ashamed of.
Driven to Suicide: Narrowly averted in the backstory. Alison was apparently so cruel to her, that she considered this. The only reason she didn't, is because she realized doing that would mean "Alison would win.".
Duet Bonding: She and Emily became closer after singing a duet of P!nk's "So What?"
Locked Out of the Loop: By season 3, she and Ezra are the only ones of the main characters' love interests to not know about the second A.
Emily opens up about the second A in the season 3 mid-season finale (in order to protect Paige, who is being framed by A), before finally explaining everything in the Halloween special. After that, Paige is actively involved with fighting A alongside the Liars (and Caleb).
Put on a Bus: After Emily breaks up with her at the end of season 1, Paige disappears.
The Bus Came Back: She briefly appears in two episodes at the end of season 2, at first hoping to rekindle her relationship with Emily, then agreeing to just be friends. Starting with season 3, she sticks around for good and starts dating Emily again.
Transparent Closet: Fans supected her sexuality ever since her first appearance, before it was clarified.
"Just because two things happen at the same time doesn't mean they're connecter."
Someone you know very well has you completely fooled
Emily's old neightbor who is now a police officer. In season 2, he assists Detective Wilden with the investigation of Alison's murder. He's in a secret relationship with Jenna Marshall prior to the start of the series, and he's killed in the Halloween train.
Ambiguously Evil: He's definitely shady, but he was innocent of the murder charges leveled against him, and was about to help Spencer before he was murdered.
Jerk with a Heart of Gold: Perhaps. He didn't kill Alison or Maya after all, was genuinely crushed when Jenna ditched him, and seemed to hold feelings for Spencer. He was about to tell her everything he knew when he was killed.
"When I think about Maya, I want to think about how she lived, not how she died."
I was actually really looking forward to hanging out with her again.
Nathan is Maya St. Germain's cousin, who arrives to Rosewood after the death of Maya.He enters Hollis College, where he is studying to become an architect, and becomes fast friends with Emily. He's revealed to be actually Maya's stalker, not her cousin, who followed her from True North, and the one Maya seeked protection from.
"If you don't want a commitment, we won't get the large popcorn"
They love you. I knew they would.
Samara Cook is a friend of Emily Fields who tried to help Paige with her coming out to her father. She works for an LGBT Pride group as part of her extracurricular activities. She dated Emily during the first half of Season 2.
"You can leave Rosewood, but Rosewood will never leave you."
I can tell when someone's lying. Can you?
Jason is the older brother of Alison DiLaurentis. He had an interesting relationship with his late sister; though they often fought, they were both conniving and willing to keep each other's secrets. Jason attended high school and was friends with Ian and Garrett, and returns to Rosewood after Ian's death.
It's actually more probable that after his sister went missing was when he first turned, although the girls stop seeing him as suspicious when Spencer discovers that secret.
Mr. Fanservice: From Season 2 on due to being played by a more attractive actor.
Otaku: In a flashback in Season 2, Jason gets angry at Alison. When Aria asks what was up, Alison says that he thought she had stolen "one of his Japanese cartoon porn books", implying he is (or was) a Hentai fan.
Off-Screen Breakup: With CeCe, prior to the start of the series, and (judging from what we could see on one of the Pretty Dirty Secrets webisodes) it did not end up well.
The Omniscient: Half-justified. Ezra has multiple people working for him and has access to an extensive surveillance system, allowing him to watch the Liars every move. However, this doesn't explain some of Mona's more extreme moves, many of which depended on advance knowledge of completely unpredictable events. (Example: Emily picks a box of Alpha-Bits from the school cafeteria cereal selection, only to find that all of the pieces have been replaced with A's. Since we see no evidence that anyone else experienced this, that means that Mona not only knew that Emily would choose that brand of cereal, she knew exactly which box of it Emily would end up with.)