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* AbortedArc: The SequelHook at the end of ''Wanted'' (the originally-planned GrandFinale for the series) implies that [[spoiler:Alison survived the fire that was believed to have killed her and left Rosewood with her family (who skipped town right after her apparent death) to start a new life elsewhere under a new name that's a SignificantAnagram of her "Alison [=DiLaurentis=]", forming a new posse at her new school. The second half of the series reveals that she did indeed survive the fire, but is in hiding in or near Rosewood, continuing to torment the girls as A along with Helper A, and while there is a TimeSkip of at least six months between ''Wanted'' and ''Twisted'', there's no indication given that she went to another school or made any other friends during that time.]]

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* AbortedArc: The SequelHook at the end of ''Wanted'' (the originally-planned GrandFinale for the series) implies that [[spoiler:Alison survived the fire that was believed to have killed her and left Rosewood with her family (who skipped town right after her apparent death) to start a new life elsewhere under a new name that's a SignificantAnagram of her "Alison [=DiLaurentis=]", forming a new posse at her new school. The second half of the series reveals that she did indeed survive the fire, but is in hiding in or near Rosewood, continuing to torment the girls as A along with Helper A, and while there is a TimeSkip of at least six months between ''Wanted'' and ''Twisted'', there's no indication given that she went to another school or made any other friends during that time.]]



** In ''Twisted'', the girls confront someone who they think is [[spoiler:Alison]], and Aria, believing she was going to kill them, pushes her in self-defense, causing her to fall to her death. Though it's later subverted, since ''Burned'' reveals that the girl, Tabitha, was killed by a blow to the head at close range (which was very much not accidental), not from the fall.

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** In ''Twisted'', the girls confront someone who they think is [[spoiler:Alison]], and Aria, believing she was going to kill them, pushes her in self-defense, causing her to fall to her death. Though it's later subverted, since ''Burned'' reveals that the girl, Tabitha, Tabitha Clark, was killed by a blow to the head at close range (which was very much not accidental), not from the fall.



* AnyoneCanDie: Anyone who is important to the plot of one or more books will probably die in the next. By the end of ''Wanted'', the dead people include Toby Cavanaugh, Mona Vanderwaal, [[spoiler:Jenna Cavanaugh, Ian Thomas, Courtney [=DiLaurentis=], Tabitha, and Gayle.]]

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* AnyoneCanDie: Anyone who is important to the plot of one or more books will probably die in the next. By the end of ''Wanted'', ''Vicious'', the dead people include Toby Cavanaugh, Mona Vanderwaal, [[spoiler:Jenna Cavanaugh, Ian Thomas, Courtney [=DiLaurentis=], Tabitha, Tabitha Clark, Gayle Riggs, and Gayle.Graham Pratt, as well as the ''real'' Kyla Kennedy.]]



* DeadAllAlong:
** Played with in regards to [[spoiler:Courtney]]. When she initially returns to Rosewood, [[spoiler:the Liars take TheReveal that she is Ali's twin, Courtney, at face value, and that their best friend Ali is dead, but then she convinces them that she ''is'' actually the friend they knew, and Courtney was the one who really died that night instead of her. By the end, it's revealed that the dead twin ''is'' Courtney, but Courtney was the "Ali" they were friends with all along; the twin who's still alive and trying to murder them as A is the ''real'' Ali.]]
** [[spoiler:In ''Crushed'', Hanna meets and befriends a girl named Kyla Kennedy at the burn clinic where she's volunteering in the hopes of getting information out of Graham. After Graham dies right as Hanna was about to get critical info from him, the girls later find out that that real Kyla was discovered to have been murdered several days ago, and conclude that the girl Hanna met was really Alison in disguise.]]



* DroppedABridgeOnHer: [[spoiler:Jenna's murder at the hands of Alison occurs very abruptly at the end of ''Killer''.]]

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* DroppedABridgeOnHer: [[spoiler:Jenna's murder at the hands of Alison occurs very abruptly at the end of ''Killer''.''Heartless''.]]



* EvilerThanThou: The girls first think A is Alison, until her corpse is discovered soon afterwards. They eventually learn that A is Mona. However, Mona denies killing Ali and doesn't know much more than the Liars do about her death [[spoiler:(or that Ali even had a twin, Courtney, who was the one who actually died)]], assuming it was Ian based on Ali's diary entries. After her death, a new A appears, taking advantage of Mona's work. It is revealed to be [[spoiler:the real Alison, who ''was'' Courtney's killer]], and she's far more malicious as A than Mona ever was. Mona doesn't actually kill anyone, and the only people she ''tries'' to kill at any point are the Liars (specifically, Hanna and Spencer at different times), her actual targets. [[spoiler:Alison]], meanwhile, kills numerous other people--such as [[spoiler:Ian, Jenna, Tabitha, and Gayle]], and attempts to kill Melissa and Iris as well--in her revenge quest on the Liars, simply for knowing too much or being in her way.

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* EvilerThanThou: The girls first think A is Alison, until her corpse is discovered soon afterwards. They eventually learn that A is Mona. However, Mona denies killing Ali and doesn't know much more than the Liars do about her death [[spoiler:(or that Ali even had a twin, Courtney, who was the one who actually died)]], assuming it was Ian based on Ali's diary entries. After her death, a new A appears, taking advantage of Mona's work. It is revealed to be [[spoiler:the real Alison, who ''was'' Courtney's killer]], and she's far more malicious as A than Mona ever was. Mona doesn't actually kill anyone, and the only people she ''tries'' to kill at any point are the Liars (specifically, Hanna and Spencer at different times), her actual targets. [[spoiler:Alison]], meanwhile, kills numerous other people--such as [[spoiler:Ian, Jenna, Tabitha, Gayle, Kyla, and Gayle]], Graham]], and attempts to kill Melissa and Iris as well--in her revenge quest on the Liars, simply for knowing too much or being in her way.



** Similarly, after their experiences with the first two "A"s demonstrated how much keeping secrets and lying could cause problems and wreck your life, their actions over the summer gave each of them an individual major secret and all of them collectively ''another'' major secret, all of which they spend much of the second half of the series trying to keep covered up. This also seems to have driven another wedge between them, since they're a bit more distant by ''Twisted'' after fully coming back together again by ''Wanted''.

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** Similarly, after their experiences with the first two "A"s demonstrated how much keeping secrets and lying could cause problems and wreck your life, their actions over the summer gave each of them an individual major secret and all of them collectively ''another'' major secret, all of which they spend much of the second half of the series trying to keep covered up. This up.
** After fully reuniting as best friends near the end of ''Wanted'', their summer secrets have
also seems to have driven another wedge between them, since they're a bit more distant as their relationship and levels of closeness are reset to early-series levels by ''Twisted'' after fully coming ''Twisted'', and it takes them several books to get back together again by to where they left off in ''Wanted''.



** [[spoiler:This is the reason that the new A (Ali) kills Ian, Jenna, and Tabitha.]]

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** [[spoiler:This is the reason that the new A (Ali) kills Ian, Jenna, Tabitha, Gayle, and Tabitha.Graham.]]


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* TwoAliasesOneCharacter: "Helper A" in the third and fourth arcs takes this UpToEleven, as the person who caused or at least was part of ''all'' of the girls' summer secrets under the aliases of:
** [[spoiler:"Easy A" Phineas, who gave Spencer study drugs to help with her college tests. She was eventually forced to frame another student for being the dealer to avoid charges.]]
** [[spoiler:Derrick, Emily's confidant during her pregnancy, who encouraged Emily to give her baby to Gayle (a rather unstable woman who was Tabitha's stepmother) instead of her original choices for the adoption, which Emily almost went through with until she realized Gayle's instability and changed her mind.]]
** [[spoiler:Jackson, the {{Jerkass}} bartender who got Madison dangerously drunk and just laughed about it; Hanna driving her home as a result led to a car accident and her framing Madison for drunk driving.]]
** [[spoiler:Olaf, who got Aria to help him steal a painting from a museum in Iceland, nearly leading to her arrest by the police had Hanna not helped her escape.]]
** [[spoiler:His real name is Nick Maxwell, also known by his nickname of "Tripp". He is Iris's unrequited crush and "Ali's" (Courtney's) ''real'' secret boyfriend (rather than Ian, whom she was only pretending to like as a cover for her relationship with Nick). He is actually ''Alison's'' boyfriend and has been ever since she was at the Preserve, promising to help her get revenge on her sister for stealing her life and on the Liars. He used Iris's feelings for him to manipulate her, and dated Courtney merely as a ploy to gain her trust so he could more easily help Ali murder her later.]]
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* AbortedArc: The SequelHook at the end of ''Wanted'' (the originally-planned GrandFinale for the series) implies that [[spoiler:Alison survived the fire that was believed to have killed her and left Rosewood with her family (who skipped town right after her apparent death) to start a new life elsewhere under a new name that's a SignificantAnigram of her "Alison [=DiLaurentis=]", forming a new posse at her new school. The second half of the series reveals that she did indeed survive the fire, but is in hiding in or near Rosewood, continuing to torment the girls as A along with Helper A, and while there is a TimeSkip of at least six months between ''Wanted'' and ''Twisted'', there's no indication given that she went to another school or made any other friends during that time.

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* AbortedArc: The SequelHook at the end of ''Wanted'' (the originally-planned GrandFinale for the series) implies that [[spoiler:Alison survived the fire that was believed to have killed her and left Rosewood with her family (who skipped town right after her apparent death) to start a new life elsewhere under a new name that's a SignificantAnigram SignificantAnagram of her "Alison [=DiLaurentis=]", forming a new posse at her new school. The second half of the series reveals that she did indeed survive the fire, but is in hiding in or near Rosewood, continuing to torment the girls as A along with Helper A, and while there is a TimeSkip of at least six months between ''Wanted'' and ''Twisted'', there's no indication given that she went to another school or made any other friends during that time.]]



** The girls get some major AesopAmnesia about the CharacterDevelopment they'd had by the end of the first eight books. Spencer is back to being über-competitive and willing to frame other people for her mistakes to come out on top; Hanna, after learning that popularity isn't everything, is also willing to shift blame to others to save her own reputation; Emily, who learned the hard way about how being blinded by love could badly cloud her judgment, makes more awful decisions by letting her heart rule her head; and Aria, though she doesn't get this as bad as the others, still has problems with her conflicting "loner" vs "wanting to belong" mentalities.

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** The girls get some major AesopAmnesia about the CharacterDevelopment they'd had by the end of the first eight books. Spencer is back to being über-competitive and willing to frame other people for her mistakes to come out on top; Hanna, after learning that popularity isn't everything, is also willing to shift blame to others to save her own reputation; Emily, who learned the hard way about how being blinded by love could badly cloud her judgment, makes more awful decisions by letting her heart rule her head; and Aria, though she doesn't get this as bad as the others, still has problems with her conflicting "loner" vs "wanting to belong" mentalities.

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* AbortedArc: The SequelHook at the end of ''Wanted'' (the originally-planned GrandFinale for the series) implies that [[spoiler:Alison survived the fire that was believed to have killed her and left Rosewood with her family (who skipped town right after her apparent death) to start a new life elsewhere under a new name that's a SignificantAnigram of her "Alison [=DiLaurentis=]", forming a new posse at her new school. The second half of the series reveals that she did indeed survive the fire, but is in hiding in or near Rosewood, continuing to torment the girls as A along with Helper A, and while there is a TimeSkip of at least six months between ''Wanted'' and ''Twisted'', there's no indication given that she went to another school or made any other friends during that time.



** However, this added backstory from ''Ali's Pretty Little Lies'' clarifies that, in fact [[spoiler:''Courtney'' was the original victim all along; she was never actually crazy, and Alison framed her for being so and got her institutionalized just to get rid of her out of jealousy since Courtney was the generally-preferred twin among their peers. Her switching places with her sister was only an attempt to live the life she always wanted that ''Alison'' stole from ''her''. When Ali confronted her about it a couple of years later, Courtney admitted that she just wanted a sister again and wanted to reconcile with her, only for Ali to murder her anyway. Not only does this make Courtney/"Their Ali" far more sympathetic, but it makes "Real Ali" infinitely less so, showing that she killed Courtney over a feud ''she'' started in the first place, and there was ''tons'' of PsychologicalProjection going on with the things Ali accused her sister of.]]

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** However, this added backstory from ''Ali's Pretty Little Lies'' clarifies that, in fact fact, [[spoiler:''Courtney'' was the original victim all along; she was never actually crazy, and Alison framed her for being so and got her institutionalized just to get rid of her out of jealousy since Courtney was the generally-preferred twin among their peers.more-well-liked twin. Her switching places with her sister was only an attempt to live the life she always wanted that ''Alison'' stole from ''her''. When Ali confronted her about it a couple of years later, Courtney admitted that she just wanted a sister again and wanted to reconcile with her, only for Ali to murder her anyway. Not only does this make Courtney/"Their Ali" far more sympathetic, but it makes "Real Ali" infinitely less so, showing that she killed Courtney over a feud ''she'' started in the first place, and there was ''tons'' of PsychologicalProjection going on with the things Ali accused her sister of.]]



* GrandFinale:
** ''Wanted'', the eighth book in the series, was originally planned to be this, as shown in the first prints and the acknowledgments. The end of the book is clearly setting each of the girls up for a more hopeful future, though there are a few mild open ends and possible plot holes still remaining, as well as a major SequelHook suggesting that [[spoiler:Alison is still alive and has started a new life in a new town under a new name]]. By the time the series ended for real, this book ends up only concluding the first half of it.
** ''Vicious'', the sixteenth main book (not counting the prequel and interquel), is the real one. There's still a possible SequelHook at the end of this one, too (as Sara Shepard is wont to do at the end of several of her series), but it's really more of a case of TheEndOrIsIt, as the small number of open ends and inconsistencies from ''Wanted'' have been resolved, and the Liars' character arcs are wrapped up even more neatly.
* HappyEndingOverride: Since ''Wanted'' was the original final book in the series, it ends with the Liars, though not in perfect places in their lives, at least doing a lot better and feeling optimistic about the future. Once the series was continued with what ended up being eight more books plus two side stories, the new novels (starting with ''Twisted'', the ninth) had to create more conflict for them to deal with, resulting in some of this:
** The girls get some major AesopAmnesia about the CharacterDevelopment they'd had by the end of the first eight books. Spencer is back to being über-competitive and willing to frame other people for her mistakes to come out on top; Hanna, after learning that popularity isn't everything, is also willing to shift blame to others to save her own reputation; Emily, who learned the hard way about how being blinded by love could badly cloud her judgment, makes more awful decisions by letting her heart rule her head; and Aria, though she doesn't get this as bad as the others, still has problems with her conflicting "loner" vs "wanting to belong" mentalities.
** Similarly, after their experiences with the first two "A"s demonstrated how much keeping secrets and lying could cause problems and wreck your life, their actions over the summer gave each of them an individual major secret and all of them collectively ''another'' major secret, all of which they spend much of the second half of the series trying to keep covered up. This also seems to have driven another wedge between them, since they're a bit more distant by ''Twisted'' after fully coming back together again by ''Wanted''.
** Spencer and Andrew Campbell, who have a sweet, fairly solid relationship built up in the second story arc, have had an OffscreenBreakup by ''Twisted'' with not much explanation.
** Though [[spoiler:Spencer's parents hadn't gotten back together by the end of ''Wanted'', they were at least trying to mend their family dynamic and all have dinner together once a week. This apparently doesn't last, as Veronica gets a new boyfriend and these gatherings don't continue.]]
** Emily's relationship with her family (especially her sister, Carolyn, with whom she always got along pretty well) deteriorates more and more throughout the second half of the series, culminating in her having permanently distanced herself her from them by the GrandFinale.
** Actually averted, though, with Spencer and Melissa, whose newfound understanding and desire to be better sisters to each other at the end of ''Wanted'' is ''not'' undone. They remain on good terms for the rest of the series.



* TookALevelInBadass: Good lord, ''Emily'' in the last arc of the series. Took several levels, in fact. For most of the books, Emily's emotional and over-forgiving nature, as well as her feelings for Ali[[spoiler:/Courtney]], cause several problems for all of the girls. However, she's the one who saves the day in both "Deadly" (the 14th book) and "Vicious" (the 16th):
** In "Deadly", the third A ([[spoiler:actually still the second A, Alison]]) and Helper A ([[spoiler:Nick Maxwell]]) try to kill the Liars at the end by [[spoiler:locking them in a room full of poisonous gas]]; however, while the rest of the girls [[spoiler:lie weakened and nearly succumb to the gas]], Emily [[spoiler:gets back up, tackles Nick and knocks him unconscious, and [[DefiantToTheEnd stands up to Alison even after the latter pulls a gun on her and almost shoots her]]]].
** In "Vicious", she takes it UpToEleven: [[spoiler:After the girls are arrested for Alison's murder and have no way to prove that she's really still alive, Emily makes a plan that involves taking a leaf out of Ali's book: to fake her death and disappear in order to fly under the radar to find Ali. ''It works''; she successfully fakes her suicide/accidental death, finds Alison (hiding out with her mother), fends off another murder attempt from Ali, gets both Ali and Mrs. D arrested, gets her friends out of jail and all of their charges dropped, and makes sure Alison is sent to an insane asylum, ridding them of her for good]].

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* TookALevelInBadass: Good lord, ''Emily'' in the last arc of the series. Took several levels, in fact. For most of the books, Emily's emotional and over-forgiving nature, as well as her feelings for Ali[[spoiler:/Courtney]], cause several problems for all of the girls. However, she's the one who saves the day in both "Deadly" ''Deadly'' (the 14th book) and "Vicious" ''Vicious'' (the 16th):
** In "Deadly", ''Deadly'', the third A ([[spoiler:actually still the second A, Alison]]) and Helper A ([[spoiler:Nick Maxwell]]) try to kill the Liars at the end by [[spoiler:locking them in a room full of poisonous gas]]; however, while the rest of the girls [[spoiler:lie weakened and nearly succumb to the gas]], Emily [[spoiler:gets back up, tackles Nick and knocks him unconscious, and [[DefiantToTheEnd stands up to Alison even after the latter pulls a gun on her and almost shoots her]]]].
** In "Vicious", ''Vicious'', she takes it UpToEleven: [[spoiler:After the girls are arrested for Alison's murder and have no way to prove that she's really still alive, Emily makes a plan that involves taking a leaf out of Ali's book: to fake her death and disappear in order to fly under the radar to find Ali. ''It works''; she successfully fakes her suicide/accidental death, finds Alison (hiding out with her mother), fends off another murder attempt from Ali, gets both Ali and Mrs. D arrested, gets her friends out of jail and all of their charges dropped, and makes sure Alison is sent to an insane asylum, ridding them of her for good]].

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* CerebusRetcon: ''Ali's Pretty Little Lies'' manages to do this to an ''already''-dark backstory:
** In ''Wanted'', originally planned to be the final book in the series, the girls learn that [[spoiler:the "Ali" they knew was actually Courtney, who was put in a mental hospital years before for repeatedly attempting to impersonate her sister, and finally succeeded in doing so after meeting them. This leads the girls to believe that "Their Ali" was always secretly nuts, and the real Alison was originally a victim who only become the also-crazy psychopath she is by the end of the book thanks to having her life unfairly stolen away from her by her twin.]]
** However, this added backstory from ''Ali's Pretty Little Lies'' clarifies that, in fact [[spoiler:''Courtney'' was the original victim all along; she was never actually crazy, and Alison framed her for being so and got her institutionalized just to get rid of her out of jealousy since Courtney was the generally-preferred twin among their peers. Her switching places with her sister was only an attempt to live the life she always wanted that ''Alison'' stole from ''her''. When Ali confronted her about it a couple of years later, Courtney admitted that she just wanted a sister again and wanted to reconcile with her, only for Ali to murder her anyway. Not only does this make Courtney/"Their Ali" far more sympathetic, but it makes "Real Ali" infinitely less so, showing that she killed Courtney over a feud ''she'' started in the first place, and there was ''tons'' of PsychologicalProjection going on with the things Ali accused her sister of.]]



* DaddysGirl: Hanna used to be like this with her dad before he remarried. However, after he married Isabel, he seems to prefer Kate to her, causing her many insecurities.

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* DaddysGirl: Hanna used to be like this with her dad dad, Tom, before he remarried. However, after he married once Tom, Hanna, Isabel, and Kate all move in together for the second story arc, he seems to prefer Kate to her, causing her many insecurities.


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* PsychologicalProjection: By the end of the series, it's very clear that [[spoiler:the real Alison]] was doing a lot of this towards [[spoiler:her twin, Courtney]]. [[spoiler:At one point in ''Wanted'', she describes her sister--the "Ali" the Liars knew--as always needing to be better than her at everything and being unwilling to share the spotlight, even though these exact traits were the reason that Ali herself framed Courtney for being crazy and got her sent away to the hospital. She also repeatedly refers to Courtney as "crazy" and "schizo", even though, again, Alison manipulated everyone to believe that about her, and Ali herself--who becomes a psychopathic murderer and sacrifices everyone and everything in a quest for misplaced revenge--is ''far'' more crazy than she ever made Courtney appear to be.]]


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* RedemptionRejection: In ''Ali's Pretty Little Lies'', after Ali [[spoiler:first tries to kill Courtney, the latter manages to temporarily talk her down and almost get her to reconsider her plans by promising to switch their identities back and confessing that she really just wants them to go back to being best friends and close sisters the way they once were. But then Alison's accomplice (Nick) arrives, and this is enough for her to harden her resolve and go through with murdering Courtney for real, even if it does leave her a bit shaken afterwards.]]
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* EvilerThanThou: The girls first think A is Alison, until her corpse is discovered soon afterwards. They eventually learn that A is Mona. However, Mona denied killing Ali and didn't know much more than the Liars did about her death [[spoiler:(or that Ali even had a twin, Courtney, who was the one who actually died)]], and assumed it was Ian based on Ali's diary entries. After her death, a new A appears, taking advantage of Mona's work. It is revealed to be [[spoiler:the real Alison, who ''was'' Courtney's killer]], and she's far more malicious as A than Mona ever was. Mona doesn't actually kill anyone, and the only people she ''tries'' to kill at any point are the Liars (specifically, Hanna and Spencer at different times), her actual targets. [[spoiler:Alison]], meanwhile, kills numerous other people--such as [[spoiler:Ian, Jenna, Tabitha, and Gayle]], and attempts to kill Melissa and Iris as well--in her revenge quest on the Liars, simply for knowing too much or being in her way.

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* EvilerThanThou: The girls first think A is Alison, until her corpse is discovered soon afterwards. They eventually learn that A is Mona. However, Mona denied denies killing Ali and didn't doesn't know much more than the Liars did do about her death [[spoiler:(or that Ali even had a twin, Courtney, who was the one who actually died)]], and assumed assuming it was Ian based on Ali's diary entries. After her death, a new A appears, taking advantage of Mona's work. It is revealed to be [[spoiler:the real Alison, who ''was'' Courtney's killer]], and she's far more malicious as A than Mona ever was. Mona doesn't actually kill anyone, and the only people she ''tries'' to kill at any point are the Liars (specifically, Hanna and Spencer at different times), her actual targets. [[spoiler:Alison]], meanwhile, kills numerous other people--such as [[spoiler:Ian, Jenna, Tabitha, and Gayle]], and attempts to kill Melissa and Iris as well--in her revenge quest on the Liars, simply for knowing too much or being in her way.



** Likewise, Hanna's dad cheated on her mom, Ashley, with Isabel, and later divorced Ashley to marry Isabel.

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** Likewise, Hanna's dad dad, Tom, cheated on her mom, Ashley, with Isabel, and later divorced Ashley to marry Isabel.
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* EvilerThanThou: The girls first think A is Alison, until her corpse is discovered soon afterwards. They eventually learn that A is Mona. However, Mona knew nothing about who killed "Ali" [[spoiler:(or that Ali even had a twin, Courtney, who was the one who actually died)]], and after her death, a new A appears, taking advantage of Mona's work. It is revealed to be [[spoiler:the real Alison, who ''was'' Courtney's killer]], and she's far more malicious as A than Mona ever was. Mona doesn't actually kill anyone, and the only people she ''tries'' to kill at any point are the Liars (specifically, Hanna and Spencer at different times), her actual targets. [[spoiler:Alison]], meanwhile, kills numerous other people--such as [[spoiler:Ian, Jenna, Tabitha, and Gayle]], and attempts to kill Melissa and Iris as well--in her revenge quest on the Liars, simply for knowing too much or being in her way.

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* EvilerThanThou: The girls first think A is Alison, until her corpse is discovered soon afterwards. They eventually learn that A is Mona. However, Mona knew nothing denied killing Ali and didn't know much more than the Liars did about who killed "Ali" her death [[spoiler:(or that Ali even had a twin, Courtney, who was the one who actually died)]], and after assumed it was Ian based on Ali's diary entries. After her death, a new A appears, taking advantage of Mona's work. It is revealed to be [[spoiler:the real Alison, who ''was'' Courtney's killer]], and she's far more malicious as A than Mona ever was. Mona doesn't actually kill anyone, and the only people she ''tries'' to kill at any point are the Liars (specifically, Hanna and Spencer at different times), her actual targets. [[spoiler:Alison]], meanwhile, kills numerous other people--such as [[spoiler:Ian, Jenna, Tabitha, and Gayle]], and attempts to kill Melissa and Iris as well--in her revenge quest on the Liars, simply for knowing too much or being in her way.



** Aria's father, Byron, cheated on her mother, Ella, with Meredith, one of his college students, and basically forces Aria to keep it a secret when she discovers this. When Ella finds out, she divorces Byron, and he eventually marries Meredith and has a kid with her.

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** Aria's father, Byron, cheated on her mother, Ella, with Meredith, one of his college students, and basically forces Aria to keep it a secret when she discovers this. When Ella finds out, out thanks to A, she divorces Byron, and he eventually marries Meredith and has a kid with her.
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* SecretDiary: Alison wrote all of her friends' secrets in a diary before her death. Mona finds the diary among Alison's (actually Courtney at that time) things, which is how she knew so many of their secrets.

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* SecretDiary: Alison wrote all of her friends' secrets in a diary before her death. Mona finds the diary among Alison's (actually Courtney at that time) things, which is how she knew so many of their secrets.



** Aria's dad, Byron, likewise has one with his own student, Merdith.

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** Aria's dad, Byron, likewise has one with his own student, Merdith.Meredith.



** This is how Hanna feels about her friendship with Mona Vanderwaal upon discovering that Mona was A all along. While she's not around to confirm it anymore, all signs and Mona's words to Spencer indicate that, yes, it was a lie. Mona witnessed the Jenna Thing, and because she was friends with Jenna, vowed to get revenge on the girls, even though Jenna herself did not want this because it was a prank that she planned herself with "Ali" that went wrong. Mona stopped being friends with Jenna when the latter wouldn't tell the truth about the incident, but was still determined to seek vengeance.
** By the end of ''Wanted'', the Liars have a mild version of this about their friendship with Ali. [[spoiler:In her JustBetweenYouAndMe note to them, the real Alison claims that Courtney, who was the "Ali" the girls knew, only chose such "uncool" people like them to be her new friends as a way to spite Alison, since they were girls that the real Ali would never have looked twice at. ''Ali's Pretty Little Lies'' reveals that, though Ali did genuinely believe this, it wasn't reeally true, and Courtney truly did love her friends; tragically, though, she'd increasingly driven them away from her by that point, and never got the chance to make up with them before Ali killed her]].
* WeCanRuleTogether: The first A, Mona, makes this offer fairly literally to Spencer when the latter learns her identity, stating that they can both be A and rule Rosewood Day together, with Spencer taking her "rightful place" as the queen bee of the school. Spencer, naturally, refuses and notes how crazy this is, resulting in A attempting to murder her.

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** This is how Hanna feels about her friendship with Mona Vanderwaal upon discovering that Mona was A all along. While she's not around to confirm it anymore, all signs and Mona's words to Spencer indicate that, yes, it was a lie. Mona witnessed the Jenna Thing, and because she was friends with Jenna, vowed to get revenge on the girls, even though Jenna herself did not want this because it was a prank that she planned herself together with "Ali" Ali that went wrong. Mona stopped being friends with Jenna when the latter wouldn't tell the truth about the incident, but was still determined to seek vengeance.
** By the end of ''Wanted'', the Liars have a mild version of this about their friendship with Ali. [[spoiler:In her JustBetweenYouAndMe note to them, the real Alison claims that Courtney, who was the "Ali" the girls knew, only chose such "uncool" people like them to be her new friends as a way to spite Alison, since they were girls that the real Ali would never have looked twice at. ''Ali's Pretty Little Lies'' reveals that, though Ali did genuinely believe this, it wasn't reeally really true, and Courtney truly did love her friends; tragically, though, she'd increasingly driven them away from her by that point, and never got the chance to make up with them before Ali killed her]].
* WeCanRuleTogether: The first A, Mona, makes this offer fairly literally to Spencer when the latter learns her identity, stating that they can both be A and rule Rosewood Day together, with Spencer taking her "rightful place" as the queen bee of the school. Spencer, naturally, refuses and notes how crazy this is, resulting in A Mona attempting to murder her.
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Unspoilering reveals from the first story arc, since this page already has a ton of spoilers and those events take place relatively early in the series.


* JumpingOffTheSlipperySlope: [[spoiler:Alison was a bad person from the get-go, framing her sister for being crazy and getting her institutionalized purely out of envy, but she started out seeking revenge only on Courtney for switching places with her and just wanted to reclaim her identity. However, after killing her sister but failing to get her life back (since her parents still believe her to be Courtney), starts blaming and seeking revenge against more and more people who played a tangential role at most in causing her problems, and loses whatever sanity she still had, killing or trying to kill nearly a dozen more people in the process.]]

to:

* JumpingOffTheSlipperySlope: [[spoiler:Alison was a bad person from the get-go, framing her sister for being crazy and getting her institutionalized purely out of envy, but she started out seeking revenge only on Courtney for switching places with her and just wanted to reclaim her identity. However, after killing her sister but failing to get her life back (since her parents still believe her to be Courtney), she starts blaming and seeking revenge against more and more people who played a tangential role at most in causing her problems, and loses whatever sanity she still had, killing or trying to kill nearly a dozen more people in the process.]]



** First A is suspected to be Ali, then Toby Cavanaugh, then Emily thinks it's Maya, Spencer thinks it's her sister Melissa, and Aria is worried it's Spencer herself. It's finally revealed to be Mona, but after she dies, but then a ''new'' A starts threatening them.

to:

** First A is suspected to be Ali, then Toby Cavanaugh, then Emily thinks it's Maya, Spencer thinks it's her sister Melissa, and Aria is worried it's Spencer herself. It's finally revealed to be Mona, but after she dies, but then a ''new'' A starts threatening them.

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Unspoilering reveals from the first story arc, since this page already has a ton of spoilers and those events take place relatively early in the series.


** In ''Unbelievable'', [[spoiler:Mona]] tries to kill Spencer after the latter discovers that she's A. Spencer, in self-defense, closes her eyes and pushes A away from her, causing A to go over the edge of the cliff and break her neck in the fall.
** In ''Twisted'', [[spoiler:the girls confront someone who they think is Alison, and Aria, believing she was going to kill them, pushes her in self-defense, causing her to fall to her death. Though it's later subverted, since ''Burned'' reveals that the girl, Tabitha, was killed by a blow to the head at close range (which was very much not accidental), not from the fall.]]

to:

** In ''Unbelievable'', [[spoiler:Mona]] Mona tries to kill Spencer after the latter discovers that she's A. Spencer, in self-defense, closes her eyes and pushes A Mona away from her, causing A Mona to go over the edge of the cliff and break her neck in the fall.
** In ''Twisted'', [[spoiler:the the girls confront someone who they think is Alison, [[spoiler:Alison]], and Aria, believing she was going to kill them, pushes her in self-defense, causing her to fall to her death. Though it's later subverted, since ''Burned'' reveals that the girl, Tabitha, was killed by a blow to the head at close range (which was very much not accidental), not from the fall.]]



* AnyoneCanDie: Anyone who is important to the plot of one or more books will probably die in the next. By the end of ''Wanted'', the dead people include [[spoiler:Toby Cavanaugh, Mona Vanderwaal, Jenna Cavanaugh, Ian, Courtney, Tabitha, and Gayle.]]

to:

* AnyoneCanDie: Anyone who is important to the plot of one or more books will probably die in the next. By the end of ''Wanted'', the dead people include [[spoiler:Toby Toby Cavanaugh, Mona Vanderwaal, Jenna [[spoiler:Jenna Cavanaugh, Ian, Courtney, Ian Thomas, Courtney [=DiLaurentis=], Tabitha, and Gayle.]]



* BreakTheCutie: Before the start of the series, Jenna was teased constantly by Alison and her friends, abused by her stepbrother, and then blinded by a prank gone wrong. She never holds the teasing against Aria and the others, though, [[spoiler:and the prank was her idea, conceived in an effort to take her stepbrother out of the picture.]]

to:

* BreakTheCutie: Before the start of the series, Jenna was teased constantly by Alison and her friends, abused by her stepbrother, and then blinded by a prank gone wrong. She never holds the teasing against Aria and the others, though, [[spoiler:and and the prank was her idea, conceived in an effort to take her stepbrother out of the picture.]]



* CassandraTruth: The girls telling Darren that a second A was tormenting them after [[spoiler:Mona's death]], and, more disturbingly, [[spoiler:Ali desperately trying to convince her parents that Courtney switched their identities. Her failure meant she was locked up in a mental asylum, where, presumably, everyone continued to insist that she was her sister. [[GoAmongMadPeople It's really no wonder she lost her mind as well.]]]]

to:

* CassandraTruth: The girls telling Darren that a second A was tormenting them after [[spoiler:Mona's death]], Mona's death, and, more disturbingly, [[spoiler:Ali desperately trying to convince her parents that Courtney switched their identities. Her failure meant she was locked up in a mental asylum, where, presumably, everyone continued to insist that she was her sister. [[GoAmongMadPeople It's really no wonder she lost her mind as well.]]]]



* DeadlyPrank: The Jenna Thing from the backstory was this. Ali convinced the other four girls to play a prank on Toby involving a firework. It backfired, leading to Jenna's blindness and Toby taking the fall for it after Ali blackmailed him. [[spoiler:Jenna had actually conspired with "Ali" (Courtney) to get rid of her stepbrother because he was molesting her. The firework went off at the wrong time, causing all the chaos after it.]]
* DisneyVillainDeath: [[spoiler:After Spencer rejects Mona's offer to become A together with her, Mona attempts to kill her, which leads to Spencer accidentally pushing Mona to her death over a cliff.]]

to:

* DeadlyPrank: The Jenna Thing from the backstory was this. Ali convinced the other four girls to play a prank on Toby involving a firework. It backfired, leading to Jenna's blindness and Toby taking the fall for it after Ali blackmailed him. [[spoiler:Jenna Jenna had actually conspired with "Ali" (Courtney) Ali to get rid of her stepbrother because he was molesting her. The firework went off at the wrong time, causing all the chaos after it.]]
it.
* DisneyVillainDeath: [[spoiler:After After Spencer rejects Mona's offer to become A together with her, Mona attempts to kill her, which leads to Spencer accidentally pushing Mona to her death over a cliff.]]



** The first A, of the first four books, is [[spoiler:Mona Vanderwaal, supposedly Hanna's best friend, who actually wants revenge on the girls for the Jenna Thing.]]

to:

** The first A, of the first four books, is [[spoiler:Mona Mona Vanderwaal, supposedly Hanna's best friend, who actually wants revenge on the girls for the Jenna Thing.]]



* TheDragon: Mona to Hanna at the beginning of the series. [[spoiler:She turns out to be a DragonWithAnAgenda, with said Agenda being getting revenge on Hanna and the other Liars for the Jenna Thing.]]

to:

* TheDragon: Mona to Hanna at the beginning of the series. [[spoiler:She She turns out to be a DragonWithAnAgenda, with said Agenda being getting revenge on Hanna and the other Liars for the Jenna Thing.]]



* DroppedABridgeOnHer: [[spoiler:Jenna's murder at the hands of Alison occurs very abruptly at the end of "Killer".]]

to:

* DroppedABridgeOnHer: [[spoiler:Jenna's murder at the hands of Alison occurs very abruptly at the end of "Killer".''Killer''.]]



* EverybodyKnewAlready: The Jenna Thing turns out to be this because Ali lied about it. [[spoiler:She claimed that no one else but them knew and swore them to secrecy. It turns out that Jenna and Toby also knew who was behind it. Mona also knew about it, which contributed to her dislike of the girls and desire to become A to get revenge on them because she had been friends with Jenna.]]

to:

* EverybodyKnewAlready: The Jenna Thing turns out to be this because Ali lied about it. [[spoiler:She She claimed that no one else but them knew and swore them to secrecy. It turns out that Jenna and Toby also knew who was behind it. Mona also knew about it, which contributed to her dislike of the girls and desire to become A to get revenge on them because she had been friends with Jenna.]]



* EvilerThanThou: The girls first think A is Alison, until her corpse is discovered soon afterwards. They eventually learn that A is [[spoiler:Mona. However, Mona knew nothing about who killed "Ali" (or that Ali even had a twin, Courtney, who was the one who actually died), and after her death, a new A appears, taking advantage of Mona's work. It is revealed to be the real Alison, who ''was'' Courtney's killer, and she's far more malicious as A than Mona ever was. Mona didn't actually kill anyone, and the only people she ''tried'' to kill at any point were the Liars (specifically, Hanna and Spencer at different times), the ones she was actually targeting. Alison, meanwhile, kills numerous other people--such as Ian, Jenna, Tabitha, and Gayle, and attempts to kill Melissa and Iris as well--in her revenge quest on the Liars, simply for knowing too much or being in her way.]]

to:

* EvilerThanThou: The girls first think A is Alison, until her corpse is discovered soon afterwards. They eventually learn that A is [[spoiler:Mona. Mona. However, Mona knew nothing about who killed "Ali" (or [[spoiler:(or that Ali even had a twin, Courtney, who was the one who actually died), died)]], and after her death, a new A appears, taking advantage of Mona's work. It is revealed to be the [[spoiler:the real Alison, who ''was'' Courtney's killer, killer]], and she's far more malicious as A than Mona ever was. Mona didn't doesn't actually kill anyone, and the only people she ''tried'' ''tries'' to kill at any point were are the Liars (specifically, Hanna and Spencer at different times), the ones she was actually targeting. Alison, her actual targets. [[spoiler:Alison]], meanwhile, kills numerous other people--such as Ian, [[spoiler:Ian, Jenna, Tabitha, and Gayle, Gayle]], and attempts to kill Melissa and Iris as well--in her revenge quest on the Liars, simply for knowing too much or being in her way.]]



** [[spoiler:Mona befriended Hanna only as a part of her elaborate revenge plot as A. After Mona's death, Hanna is devastated to realize that their close friendship was never genuine on Mona's end.]]

to:

** [[spoiler:Mona Mona befriended Hanna only as a part of her elaborate revenge plot as A. After Mona's death, Hanna is devastated to realize that their close friendship was never genuine on Mona's end.]]



** [[spoiler:"Mona always knew the best dirt on people"]] less than forty pages into the first book will jump straight out at you on a reread.

to:

** [[spoiler:"Mona "Mona always knew the best dirt on people"]] people" less than forty pages into the first book will jump straight out at you on a reread.



** It is revealed in ''Unbelievable'' that [[spoiler:Mona Vanderwaal is A and has planned everything that's happened to the girls (so far) all along.]]

to:

** It is revealed in ''Unbelievable'' that [[spoiler:Mona Mona Vanderwaal is A and has planned everything that's happened to the girls (so far) all along.]]



** Hanna forms one of her own after [[spoiler:Mona's demise]] for a short while with Naomi, Riley, and her stepsister Kate.

to:

** Hanna forms one of her own after [[spoiler:Mona's demise]] Mona's demise for a short while with Naomi, Riley, and her stepsister Kate.



** The reason [[spoiler:Hanna]] gets hit by a car in ''Perfect''. A sends her another threatening message, but accidentally uses their regular phone instead of the blocked one, [[spoiler:and Hanna recognizes the number as belonging to her best friend, Mona Vanderwaal.]]

to:

** The reason [[spoiler:Hanna]] Hanna gets hit by a car in ''Perfect''. A sends her another threatening message, but accidentally uses their regular phone instead of the blocked one, [[spoiler:and and Hanna recognizes the number as belonging to her best friend, Mona Vanderwaal.]]



* HeWhoFightsMonsters: [[spoiler:Downplayed, since Alison was a "monster" from the get-go, framing her sister for being crazy and getting her institutionalized purely out of envy. Still, she started out seeking revenge only on Courtney for switching places with her and just wanted to reclaim her identity. However, after killing her sister but failing to get her life back (since her parents still believe her to be Courtney), Ali starts blaming and seeking revenge against more and more people who played a tangential role at best in causing her problems, and kills or tries to kill nearly a dozen more people in the process.]]



* JumpingOffTheSlipperySlope: [[spoiler:Alison was a bad person from the get-go, framing her sister for being crazy and getting her institutionalized purely out of envy, but she started out seeking revenge only on Courtney for switching places with her and just wanted to reclaim her identity. However, after killing her sister but failing to get her life back (since her parents still believe her to be Courtney), starts blaming and seeking revenge against more and more people who played a tangential role at most in causing her problems, and loses whatever sanity she still had, killing or trying to kill nearly a dozen more people in the process.]]



** Mona proves to be very skilled with this, using her intelligence [[spoiler:to plan the whole A scheme and befriend Hanna only for the purpose of taking her down later.]]

to:

** Mona proves to be very skilled with this, using her intelligence [[spoiler:to to plan the whole A scheme and befriend Hanna only for the purpose of taking her down later.]]



** [[spoiler:Ian and Alison, though it's later revealed Ali wasn't actually involved with him and was leading him on.]]

to:

** [[spoiler:Ian Ian and Alison, though [[spoiler:though it's later revealed Ali wasn't actually involved with him and was leading him on.]]



** [[spoiler:First A is suspected to be Ali, then Toby Cavanaugh, then Emily thinks it's Maya, Spencer thinks it's her sister Melissa, and Aria is worried it's Spencer herself. It's finally revealed to be Mona, but then a ''new'' A starts threatening them.]]
** [[spoiler:The second A seems to be a man the girls hadn't even spoken to,]] but it turns out [[spoiler:that was wrong, too. It's Ali.]]
** [[spoiler:Emily gets led far off track when she finds out that an Amish girl named Leah has gone missing, and Leah's boyfriend was Darren. This causes her to think that Darren had killed Leah and it wasn't Ali that died.]]

to:

** [[spoiler:First First A is suspected to be Ali, then Toby Cavanaugh, then Emily thinks it's Maya, Spencer thinks it's her sister Melissa, and Aria is worried it's Spencer herself. It's finally revealed to be Mona, but after she dies, but then a ''new'' A starts threatening them.them.
** The second A seems to be a man the girls hadn't even spoken to, but it turns out that was wrong, too. [[spoiler:It's Ali.
]]
** [[spoiler:The second A seems to be a man the girls hadn't even spoken to,]] but it turns out [[spoiler:that was wrong, too. It's Ali.]]
** [[spoiler:Emily
Emily gets led far off track when she finds out that an Amish girl named Leah has gone missing, and Leah's boyfriend was Darren. This causes her to think that Darren had killed Leah and it wasn't Ali that died.]]



* SecretDiary: Alison wrote all of her friends' secrets in a diary before her death. [[spoiler:Mona finds the diary among Alison's (actually Courtney at that time) things, which is how she knew so many of their secrets.]]
* SecretIdentity: A is the identity of the person blackmailing the girls. The first A is [[spoiler:Mona]] and the second one is [[spoiler:Alison, who later is revealed to also have an accomplice, "Helper A", her boyfriend Nick]].

to:

* SecretDiary: Alison wrote all of her friends' secrets in a diary before her death. [[spoiler:Mona Mona finds the diary among Alison's (actually Courtney at that time) things, which is how she knew so many of their secrets.]]
secrets.
* SecretIdentity: A is the identity of the person blackmailing the girls. The first A is [[spoiler:Mona]] Mona and the second one is [[spoiler:Alison, who later is revealed to also have an accomplice, "Helper A", her boyfriend Nick]].



** Books 1-4: Trying to figure out who A is, with the secondary goal of finding Ali's killer. [[spoiler:The arc concludes with them learning that A is Mona, but not having a decisive answer for who killed Ali. (They think they know, but the next arc reveals that they're wrong.)]]

to:

** Books 1-4: Trying to figure out who A is, with the secondary goal of finding Ali's killer. [[spoiler:The The arc concludes with them learning that A is Mona, but not having a decisive answer for who killed Ali. (They think they know, but the next arc reveals that they're wrong.)]])



* TeenPregnancy: [[spoiler:Emily ended up pregnant after losing her virginity to Isaac, and secretly had a baby over the summer. This is one of the things that A tortures her about in the third arc.]]

to:

* TeenPregnancy: [[spoiler:Emily Emily ended up pregnant after losing her virginity to Isaac, and secretly had a baby over the summer. This is one of the things that A tortures her about in the third arc.]]



** This is how Hanna feels about her friendship with [[spoiler:Mona Vanderwaal]] upon discovering that [[spoiler:Mona was A]]. While she's not around to confirm it anymore, all signs and [[spoiler:Mona's]] words to Spencer indicate that, yes, it was a lie. [[spoiler:Mona witnessed the Jenna Thing, and because she was friends with Jenna, vowed to get revenge on the girls, even though Jenna herself did not want this because it was a prank that she planned herself with "Ali" that went wrong. Mona stopped being friends with Jenna when the latter wouldn't tell the truth about the incident, but was still determined to seek vengeance.]]

to:

** This is how Hanna feels about her friendship with [[spoiler:Mona Vanderwaal]] Mona Vanderwaal upon discovering that [[spoiler:Mona Mona was A]]. A all along. While she's not around to confirm it anymore, all signs and [[spoiler:Mona's]] Mona's words to Spencer indicate that, yes, it was a lie. [[spoiler:Mona Mona witnessed the Jenna Thing, and because she was friends with Jenna, vowed to get revenge on the girls, even though Jenna herself did not want this because it was a prank that she planned herself with "Ali" that went wrong. Mona stopped being friends with Jenna when the latter wouldn't tell the truth about the incident, but was still determined to seek vengeance.]]



* WeCanRuleTogether: The first A, [[spoiler:Mona]], makes this offer fairly literally to Spencer when the latter learns her identity, stating that they can both be A and rule Rosewood Day together, with Spencer taking her "rightful place" as the queen bee of the school. Spencer, naturally, refuses and notes how crazy this is, resulting in A attempting to murder her.

to:

* WeCanRuleTogether: The first A, [[spoiler:Mona]], Mona, makes this offer fairly literally to Spencer when the latter learns her identity, stating that they can both be A and rule Rosewood Day together, with Spencer taking her "rightful place" as the queen bee of the school. Spencer, naturally, refuses and notes how crazy this is, resulting in A attempting to murder her.



* WoobieDestroyerOfWorlds: [[spoiler:Courtney [=DiLaurentis=]]]. [[spoiler:At first, she and her twin sister, Alison, were the best of friends and as close as could be; however, gradually, Ali's more intense personality caused the more chill, comforting Courtney to become the more popular sister. Ali got jealous of this, and would threaten Courtney into pretending to be her, but always denied it when Courtney told their parents about it, causing the latter to come off as crazy. Courtney was wrongly diagnosed as a paranoid schizophrenic, and spent three years of her life in a mental hospital starting at the age of ''nine''. Her parents sort of forgot about her and treated her like she was unwanted when she came home to visit, staying in a dinky guestroom and not being allowed outside. Her family even changed their last name from [=Day-DiLaurentis=] to [=DiLaurentis=], because of the shame of having a child in a mental institution. Is it any wonder Courtney wanted to be free and have her old life back? She eventually does manage to switch places with Alison and form her own group of close friends, but gradually, her paranoia and stress over her sister potentially being released from the hospital and coming back to torment her causes her to treat her friends like shit and alienate them. Finally, Ali does indeed come home and kills Courtney for stealing her life, even though Alison started the whole ordeal and Courtney only wanted the happy life she deserved in the first place.]]

to:

* WoobieDestroyerOfWorlds: [[spoiler:Courtney [=DiLaurentis=]]]. [[spoiler:At [=DiLaurentis=]. At first, she and her twin sister, Alison, were the best of friends and as close as could be; however, gradually, Ali's more intense personality caused the more chill, comforting Courtney to become the more popular sister. Ali got jealous of this, and would threaten Courtney into pretending to be her, but always denied it when Courtney told their parents about it, causing the latter to come off as crazy. Courtney was wrongly diagnosed as a paranoid schizophrenic, and spent three years of her life in a mental hospital starting at the age of ''nine''. Her parents sort of forgot about her and treated her like she was unwanted when she came home to visit, staying in a dinky guestroom and not being allowed outside. Her family even changed their last name from [=Day-DiLaurentis=] to [=DiLaurentis=], because of the shame of having a child in a mental institution. Is it any wonder Courtney wanted to be free and have her old life back? She eventually does manage to switch places with Alison and form her own group of close friends, but gradually, her paranoia and stress over her sister potentially being released from the hospital and coming back to torment her causes her to treat her friends like shit and alienate them. Finally, Ali does indeed come home and kills Courtney for stealing her life, even though Alison started the whole ordeal and Courtney only wanted the happy life she deserved in the first place.]]
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** Conversely, in ''Vicious'', [[spoiler:Ali's mom has been helping her hide from the law, and got them both fake [=IDs=]; in order to make sure that "Tiffany Day" doesn't at all resemble Alison [=DiLaurentis=], she's become fat and died her hair a mousy brown color. Hanna describes her as looking exactly like the kind of girl Ali herself would have once mocked mercilessly]].

to:

** Conversely, in ''Vicious'', [[spoiler:Ali's mom has been helping her hide from the law, and got them both fake [=IDs=]; in order to make sure that "Tiffany Day" doesn't at all resemble Alison [=DiLaurentis=], she's become fat and died dyed her hair a mousy brown color. Hanna describes her as looking exactly like the kind of girl Ali herself would have once mocked mercilessly]].
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Added DiffLines:

* RemarriedToTheMistress:
** Aria's father, Byron, cheated on her mother, Ella, with Meredith, one of his college students, and basically forces Aria to keep it a secret when she discovers this. When Ella finds out, she divorces Byron, and he eventually marries Meredith and has a kid with her.
** Likewise, Hanna's dad cheated on her mom, Ashley, with Isabel, and later divorced Ashley to marry Isabel.

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No longer a trope.


* YourCheatingHeart: Quite often during the series. By the end of it, Hanna is the only one of the four main girls who has neither cheated on a partner nor been a "homewrecker".
** Aria's father, Byron, cheated on her mother, Ella, with Meredith, one of his college students, and basically forces Aria to keep it a secret when she discovers this. When Ella finds out, she divorces Byron, and he eventually marries Meredith and has a kid with her.
** Likewise, Hanna's dad cheated on her mom, Ashley, with Isabel, and later divorced Ashley to marry Isabel.
** Ian and Wren both cheat(ed) on [[TheGloriousWarOfSisterlyRivalry Melissa]] with [[SiblingTriangle Spencer]].
** Aria cheats on Sean with Ezra, resulting in Sean breaking up with her and calling the cops on them.
** Emily cheats on Ben with Maya when she realizes she's not straight, then cheats on Maya with Trista when she starts believing that the former might be A.
** When Aria and Noel are broken up, she gets back together with Ezra, only to find him cheating on her with Klaudia.
** Ella's new boyfriend tries to cheat on her ''with Aria'', who does not take this well.
** Partway through the series, it's revealed that, for a long time, [[spoiler:Spencer's]] father [[spoiler:Peter Hastings]] and [[spoiler:Alison's and Courtney's]] mother [[spoiler:Jessica [=DiLaurentis=]]] have been having an affair behind their respective spouses' backs. [[spoiler:It's been going on since before the girls were even born, as Peter is Alison's and Courtney's biological father as a result of the affair, meaning that they are Spencer's half-sisters (explaining the resemblance between them).]] When [[spoiler:Veronica Hastings]] learns of this herself not too long after, she divorces [[spoiler:Peter]].

to:

* YourCheatingHeart: Quite often during the series. By the end of it, Hanna is the only one of the four main girls who has neither cheated on a partner nor been a "homewrecker".
** Aria's father, Byron, cheated on her mother, Ella, with Meredith, one of his college students, and basically forces Aria to keep it a secret when she discovers this. When Ella finds out, she divorces Byron, and he eventually marries Meredith and has a kid with her.
** Likewise, Hanna's dad cheated on her mom, Ashley, with Isabel, and later divorced Ashley to marry Isabel.
** Ian and Wren both cheat(ed) on [[TheGloriousWarOfSisterlyRivalry Melissa]] with [[SiblingTriangle Spencer]].
** Aria cheats on Sean with Ezra, resulting in Sean breaking up with her and calling the cops on them.
** Emily cheats on Ben with Maya when she realizes she's not straight, then cheats on Maya with Trista when she starts believing that the former might be A.
** When Aria and Noel are broken up, she gets back together with Ezra, only to find him cheating on her with Klaudia.
** Ella's new boyfriend tries to cheat on her ''with Aria'', who does not take this well.
** Partway through the series, it's revealed that, for a long time, [[spoiler:Spencer's]] father [[spoiler:Peter Hastings]] and [[spoiler:Alison's and Courtney's]] mother [[spoiler:Jessica [=DiLaurentis=]]] have been having an affair behind their respective spouses' backs. [[spoiler:It's been going on since before the girls were even born, as Peter is Alison's and Courtney's biological father as a result of the affair, meaning that they are Spencer's half-sisters (explaining the resemblance between them).]] When [[spoiler:Veronica Hastings]] learns of this herself not too long after, she divorces [[spoiler:Peter]].
----

Added: 884

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* EvilerThanThou: The girls first think A is Alison, until her corpse is discovered soon afterwards. They eventually learn that A is [[spoiler:Mona. However, Mona knew nothing about who killed "Ali" (or that Ali even had a twin, Courtney, who was the one who actually died), and after her death, a new A appears, taking advantage of Mona's work. It is revealed to be the real Alison, who ''was'' Courtney's killer, and she's far more malicious as A than Mona ever was. Mona didn't actually kill anyone, and the only people she ''tried'' to kill at any point were the Liars (specifically, Hanna and Spencer at different times), the ones she was actually targeting. Alison, meanwhile, kills numerous other people--such as Ian, Jenna, Tabitha, and Gayle, and attempts to kill Melissa and Iris as well--in her revenge quest on the Liars, simply for knowing too much or being in her way.]]



* ManBehindTheMan: The girls first think A is Alison, until her corpse is discovered soon afterwards. They eventually learn that A is [[spoiler:Mona. However, Mona knew nothing about who killed "Ali" (or that Ali even had a twin, Courtney, who was the one who actually died), and after her death, a new A appears, taking advantage of Mona's work. It is revealed to be the real Alison, who ''was'' Courtney's killer, and she's far more malicious as A than Mona ever was. Mona didn't actually kill anyone, and the only people she ''tried'' to kill at any point were the Liars (specifically, Hanna and Spencer at different times), the ones she was actually targeting. Alison, meanwhile, kills numerous other people--such as Ian, Jenna, Tabitha, and Gayle, and attempts to kill Melissa and Iris as well--in her revenge quest on the Liars, simply for knowing too much or being in her way.]]



** Topping those two is none other than [[spoiler:Alison]] herself. [[spoiler:When she was only 8-9 years old, she successfully manipulated her parents and a whole bunch of doctors into believing that Courtney was a paranoid schizophrenic in order to get her institutionalized so she wouldn't have to share the spotlight with her sister anymore. In the present day, she uses her skills to manipulate the girls into believing false information when she becomes A, even more than Mona had. After meeting them under the identity of "Courtney", she manages to trick them into believing that she was the same girl they'd been friends with, and that she wants to "rebuild" their friendship better than it had been, in order to lure them into a trap so she can attempt to murder them.]]

to:

** Topping those two is none other than [[spoiler:Alison]] herself. [[spoiler:When she was only 8-9 years old, she successfully manipulated her parents and a whole bunch of doctors into believing that Courtney was a paranoid schizophrenic in order to get her institutionalized so she wouldn't have to share the spotlight with her sister anymore. In the present day, she uses her skills to manipulate the girls into believing false information when she becomes A, even more than Mona had. After meeting them under the identity of "Courtney", she manages to trick them into believing that she was she's the same girl they'd been friends with, and that she wants to "rebuild" their friendship better than it had been, in order to lure them into a trap so she can attempt to murder them.]]



* [[NiceGirl]]: Emily. [[spoiler:She couldn't even bear to let Alison die in a fire and left the door open for her to get out as well, despite the fact that Alison ''had just tried to kill'' her and her friends.]]

to:

* [[NiceGirl]]: NiceGirl: Emily. [[spoiler:She couldn't even bear to let Alison die in a fire and left the door open for her to get out as well, despite the fact that Alison ''had just tried to kill'' her and her friends.]]



* OrWasItADream: Hanna is visited by Alison while she is in the hospital in a weird surreal dream-like state leaving us unsure where it was real or not. It's later revealed that [[spoiler:Alison (the real one) really did visit Hanna because she's still alive.]]

to:

* OrWasItADream: Hanna is visited by Alison while she is in the hospital in a weird surreal dream-like state state, leaving us unsure where whether it was real or not. It's later revealed that [[spoiler:Alison (the real one) is still alive, and really did visit Hanna because she's still alive.to mess with her head.]]



** [[spoiler:First A was thought to be Ali, then Toby Cavanaugh, then Emily thought it was Maya and Spencer thought it was her sister Melissa. It was finally revealed to be Mona, but then a ''new'' A starts threatening them.]]

to:

** [[spoiler:First A was thought is suspected to be Ali, then Toby Cavanaugh, then Emily thought it was Maya and thinks it's Maya, Spencer thought it was thinks it's her sister Melissa. It was Melissa, and Aria is worried it's Spencer herself. It's finally revealed to be Mona, but then a ''new'' A starts threatening them.]]



** [[spoiler:Emily gets led far off track when she finds out that an Amish girl named Leah had gone missing, and Leah's boyfriend was Darren. This caused her to think that Darren had killed Leah and it wasn't Ali that died.]]

to:

** [[spoiler:Emily gets led far off track when she finds out that an Amish girl named Leah had has gone missing, and Leah's boyfriend was Darren. This caused causes her to think that Darren had killed Leah and it wasn't Ali that died.]]



** Books 5-8: Learning the second A's identity, and determining Ali's killer for real this time. [[spoiler:Both of them are the same person: the ''real'' Alison DiLaurentis, who murdered the "Ali" that the Liars knew, actually her twin sister Courtney.]]

to:

** Books 5-8: Learning the second A's identity, and determining Ali's killer for real this time. [[spoiler:Both of them are the same person: the ''real'' Alison DiLaurentis, [=DiLaurentis=], who murdered the "Ali" that the Liars knew, actually her twin sister Courtney.]]

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** Toby Cavanaugh kills himself near the end of "Flawless" after Emily rejects him upon discovering his "secret". (Though it turns out she was wrong about this; she mistakenly thought he was A, but said secret, which the girls only learn after his death, was actually that he used to molest his stepsister, Jenna.)

to:

** Toby Cavanaugh kills himself near the end of "Flawless" ''Flawless'' after Emily rejects him upon discovering his "secret". (Though it turns out she was wrong about this; she mistakenly thought he was A, but said secret, which the girls only learn after his death, was actually that he used to molest his stepsister, Jenna.)



** Conversely, in ''Vicious'', [[spoiler:Ali's mom has been helping her hide from the law, and got them both fake IDs; in order to make sure that "Tiffany Day" doesn't at all resemble Alison [=DiLaurentis=], she's become fat and died her hair a mousy brown color. Hanna describes her as looking exactly like the kind of girl Ali herself would have once mocked mercilessly]].

to:

** Conversely, in ''Vicious'', [[spoiler:Ali's mom has been helping her hide from the law, and got them both fake IDs; [=IDs=]; in order to make sure that "Tiffany Day" doesn't at all resemble Alison [=DiLaurentis=], she's become fat and died her hair a mousy brown color. Hanna describes her as looking exactly like the kind of girl Ali herself would have once mocked mercilessly]].



* {{Irony}}: The reason that Alison's parents [[spoiler:hid Alison's twin sister, Courtney, from the world]] was because they thought that [[spoiler:Courtney was crazy.]] Tragically, it turns out that [[spoiler:Alison, their "perfect little girl", was the one that would go around blackmailing people, ruining lives, tearing apart families, and committing numerous counts of murder without even showing the slightest sign of remorse.]] The worst part? [[spoiler:It turns out that Courtney was never the crazy one in the first place, having been framed by her sister who successfully tricked them into believing this, and Courtney was much closer all along to the "perfect daughter" that they falsely believed Alison to be.]]

to:

* {{Irony}}: The reason that Alison's parents [[spoiler:hid Alison's her twin sister, Courtney, from the world]] was because they thought that [[spoiler:Courtney was crazy.]] Tragically, it turns out that [[spoiler:Alison, [[spoiler:Ali, their "perfect little girl", was the one that would go around blackmailing people, ruining lives, tearing apart families, and committing numerous counts of murder without even showing the slightest sign of remorse.]] The worst part? [[spoiler:It turns out that Courtney was never the crazy one in the first place, having been framed by her sister who successfully tricked them into believing this, and Courtney was much closer all along to the "perfect daughter" that they falsely believed Alison to be.]]



* Interquel: ''Pretty Little Secrets'' was the eleventh book published in the series, coming out halfway through the third arc of the series, but takes place between the first and second arcs (between the fourth and fifth books), showing how the second A took over from the first one, who died at the end of the fourth book.

to:

* Interquel: {{Interquel}}: ''Pretty Little Secrets'' was the eleventh book published in the series, coming out halfway through the third arc of the series, but takes place between the first and second arcs (between the fourth and fifth books), showing how the second A took over from the first one, who died at the end of the fourth book.



** [[spoiler:Zig-zagged.Spencer thinks she might be adopted and finds a woman who claims to be her birth mother, but then it turns out that her parents are hers, and the woman she thought was her mother was in fact her gestational surrogate trying to get more money from the Hastings.]]
** In a more straight example, [[spoiler:Spencer's dad is Alison and Courtney's father]].
* MamaBear: Hanna's mom is rather protective of her. Even Darren lampshades this.
** [[spoiler:Emily who thinks the New A is still Ali is willing to forgive Ali if she apologizes, until the moment she gets texts threatening her new born daughter]]
* ManBehindTheMan: The girls first think A is Alison which turns out to be wrong because it is [[spoiler:Mona. However, Mona knew nothing about Courtney and after her death a new A appeared. It is revealed to be Alison who was actually behind it this time and she was far more malicious as A than Mona had ever been since she killed Jenna and Ian.]]
* ManipulativeBitch: Courtney proves to be very skilled at manipulating other people. She was good at getting her friends to tell her their secrets. Afterwards, Courtney would dangle their secrets in front of the other girls seemingly enjoying it. Not only that, Courtney had no problems with [[spoiler:tricking people into thinking she was Alison.]]
** Mona proves to be very skilled with this using her intelligence [[spoiler:to plan the whole A scheme and befriend Hanna only for the purpose of taking her down later.]]
** Topping those two is none other than Alison herself. [[spoiler:She used her skills to manipulate the girls into believing false information when she became A even more than Mona. Ali then used her skills to convince the girls she was their friend because she was ultimately trying to kill them.]]

to:

** [[spoiler:Zig-zagged.Zig-zagged.Spencer thinks she might be adopted and finds a woman who claims to be her birth mother, but then it turns out that her parents are hers, and the woman she thought was her mother was in fact her gestational surrogate trying to get more money from the Hastings.]]
Hastingses.
** In a more straight example, [[spoiler:Spencer's dad is Alison Alison's and Courtney's father]].
biological father, as a product of the affair between him and Jessica [=DiLaurentis=]]].
* MamaBear: MamaBear:
**
Hanna's mom is rather protective of her. Even Darren lampshades this.
** [[spoiler:Emily [[spoiler:Emily, who (correctly) thinks the New A is still Ali Ali, is willing to forgive Ali if she apologizes, apologizes...until the moment she Emily gets texts threatening her new born daughter]]
* ManBehindTheMan: The girls first think A is Alison
newborn daughter, at which turns out to be wrong because it is [[spoiler:Mona. However, Mona knew nothing about Courtney and after her death a new A appeared. It is revealed to be Alison who was actually behind it this time and she was far more malicious as A than Mona had ever been since she killed Jenna and Ian.point all bets are off.]]
** In a villainous and somewhat tragic example, [[spoiler:in the final book, Emily, who faked her death to hunt down Alison, discovers that Ali has been able to stay hidden because her mother has been helping her. Emily realizes that, even though Mrs. [=DiLaurentis=] knows that Ali is a monster and despite everything she's done, [[ThickerThanWater she's still her daughter]]. Indeed, Mrs. [=DiLaurentis=] almost (reluctantly) lets Ali kill Emily, but luckily, the police arrive JustInTime]].
* ManipulativeBitch: Courtney proves ManBehindTheMan: The girls first think A is Alison, until her corpse is discovered soon afterwards. They eventually learn that A is [[spoiler:Mona. However, Mona knew nothing about who killed "Ali" (or that Ali even had a twin, Courtney, who was the one who actually died), and after her death, a new A appears, taking advantage of Mona's work. It is revealed to be the real Alison, who ''was'' Courtney's killer, and she's far more malicious as A than Mona ever was. Mona didn't actually kill anyone, and the only people she ''tried'' to kill at any point were the Liars (specifically, Hanna and Spencer at different times), the ones she was actually targeting. Alison, meanwhile, kills numerous other people--such as Ian, Jenna, Tabitha, and Gayle, and attempts to kill Melissa and Iris as well--in her revenge quest on the Liars, simply for knowing too much or being in her way.]]
* ManipulativeBitch:
** Alison [[spoiler:(actually Courtney)]] proved
to be very skilled at manipulating other people. She was good at getting her friends to tell her their secrets. Afterwards, Courtney she would dangle their secrets in front of them in the other girls girls' company, seemingly enjoying it. Not only that, Courtney had no problems with she spent over a year [[spoiler:tricking people into thinking she was Alison.Alison, though her motivations for doing so were sympathetic, at least.]]
** Mona proves to be very skilled with this this, using her intelligence [[spoiler:to plan the whole A scheme and befriend Hanna only for the purpose of taking her down later.]]
** Topping those two is none other than Alison [[spoiler:Alison]] herself. [[spoiler:She used [[spoiler:When she was only 8-9 years old, she successfully manipulated her parents and a whole bunch of doctors into believing that Courtney was a paranoid schizophrenic in order to get her institutionalized so she wouldn't have to share the spotlight with her sister anymore. In the present day, she uses her skills to manipulate the girls into believing false information when she became A becomes A, even more than Mona. Ali then used her skills to convince Mona had. After meeting them under the girls identity of "Courtney", she manages to trick them into believing that she was the same girl they'd been friends with, and that she wants to "rebuild" their friend because friendship better than it had been, in order to lure them into a trap so she was ultimately trying can attempt to kill murder them.]]



** Byron and Meredith



** Aria and Xavier
** Aria and Jason
** [[spoiler:Ian and Alison]]
* MythologyGag: [[InvertedTrope Inverted]], since this is the source material making a ShoutOut to it's [[Series/PrettyLittleLiars TV adaptation]]: In one book, the actress playing Hanna in a film based on what happened to the Liars mouths off to the director and loses her job as a result. Among the suggestions for her replacement is Creator/LucyHale, who plays Aria in the TV series.
** When Hanna visits Madison, [[spoiler:the girl she framed for the car crash A got them both into, to apologize]], she mentions that she'd mistakenly thought Hanna was "the blonde Pretty Little Liar," an allusion to her being blonde in her more widely-known TV incarnation. In the books, Hanna's a brunette while Spencer is the blonde of the group.
* TheNicknamer: Alison frequently gave nicknames to people. They included Jenna the Jerk, Snow White for Jenna as well, Hefty Hanna and Killer for Emily.
* [[NiceGuy Nice Girl]]: Emily. [[spoiler:She couldn't even bear to let Alison die in a fire, despite the fact that Alison ''had just tried to kill'' her and her friends.]]

to:

** Aria and Xavier
** Aria and Jason
** [[spoiler:Ian and Alison]]
Alison, though it's later revealed Ali wasn't actually involved with him and was leading him on.]]
* MythologyGag: MythologyGag:
**
[[InvertedTrope Inverted]], since this is the source material making a ShoutOut to it's its [[Series/PrettyLittleLiars TV adaptation]]: In one book, the actress playing Hanna in a film based on what happened to the Liars mouths off to the director and loses her job as a result. Among the suggestions for her replacement is Creator/LucyHale, who plays Aria in the TV series.
** When Hanna visits Madison, [[spoiler:the girl she framed for the car crash that A got them both into, to apologize]], she mentions that she'd mistakenly thought Hanna was "the blonde Pretty Little Liar," an allusion to her being blonde in her more widely-known TV incarnation. In the books, Hanna's a brunette while Spencer is the blonde of the group.
* TheNicknamer: Alison frequently gave nicknames to people. They included Jenna the Jerk, Snow White for Jenna as well, Hefty Hanna Hanna, and Killer "Killer" for Emily.
* [[NiceGuy Nice Girl]]: [[NiceGirl]]: Emily. [[spoiler:She couldn't even bear to let Alison die in a fire, fire and left the door open for her to get out as well, despite the fact that Alison ''had just tried to kill'' her and her friends.]]



* PetTheDog: Alison ([[spoiler:really, Courtney posing as Ali]]) empathized with Jenna’s “sibling issues” and conspired to help her get Toby sent away, so that she could be free from his sexual abuse.
* PosthumousCharacter: Ali.
** [[spoiler:It is revealed in ''Wanted'' that Ali hadn't died at all; it was Courtney.]]
* Prequel: ''Ali's Pretty Little Lies'', which fleshes out the series backstory by taking place before and leading up to the time that Ali died. [[spoiler:Most of it is told from Courtney's point of view, up until she's killed by Alison; afterward, Ali takes over the narrative for the final chapter.]]

to:

* PetTheDog: Alison ([[spoiler:really, Courtney posing as Ali]]) empathized with Jenna’s “sibling issues” (Toby was molesting Jenna), and conspired to help her get Toby sent away, so that she could be free from his her stepbrother's sexual abuse.
* PosthumousCharacter: Ali.
** [[spoiler:It is revealed in ''Wanted'' that Ali hadn't died at all; it
Ali. [[spoiler:Or rather, the girl whom the Liars knew as Ali, who was actually her twin sister, Courtney.]]
* Prequel: {{Prequel}}: ''Ali's Pretty Little Lies'', which fleshes out the series backstory by taking place before and leading up to the time that Ali died. [[spoiler:Most of it is told from Courtney's point of view, up until she's killed by Alison; afterward, Ali takes over the narrative for the final chapter.]]



* TeenPregnancy: [[spoiler:Emily ended up pregnant after losing her virginity to Isaac, and ended up having a baby over the summer. This is one of the things that A tortures her about in the third arc.]]

to:

* TeenPregnancy: [[spoiler:Emily ended up pregnant after losing her virginity to Isaac, and ended up having secretly had a baby over the summer. This is one of the things that A tortures her about in the third arc.]]



* TookALevelInBadass: Good lord, ''Emily'' in the last arc of the series. Took several levels, in fact. For most of the books, Emily's emotional and over-forgiving nature, as well as her feelings for Ali[[spoiler:/Courtney]], caused several problems for all of the girls. However, she's the one who saves the day in both "Deadly" (the 14th book) and "Vicious" (the 16th):

to:

* TookALevelInBadass: Good lord, ''Emily'' in the last arc of the series. Took several levels, in fact. For most of the books, Emily's emotional and over-forgiving nature, as well as her feelings for Ali[[spoiler:/Courtney]], caused cause several problems for all of the girls. However, she's the one who saves the day in both "Deadly" (the 14th book) and "Vicious" (the 16th):



** In "Vicious", she takes it UpToEleven: [[spoiler:After the girls are arrested for Alison's murder and have no way to prove that she's really still alive, Emily makes a plan that involves taking a leaf out of Ali's book: to fake her death and disappear in order to fly under the radar to find Ali. ''It works''; she successfully fakes her death, finds Alison (hiding out with her mother), fends off another murder attempt from Ali, gets both Ali and Mrs. D arrested, gets her friends out of jail and all of their charges dropped, and makes sure Alison is sent to an insane asylum, ridding them of her for good]].

to:

** In "Vicious", she takes it UpToEleven: [[spoiler:After the girls are arrested for Alison's murder and have no way to prove that she's really still alive, Emily makes a plan that involves taking a leaf out of Ali's book: to fake her death and disappear in order to fly under the radar to find Ali. ''It works''; she successfully fakes her suicide/accidental death, finds Alison (hiding out with her mother), fends off another murder attempt from Ali, gets both Ali and Mrs. D arrested, gets her friends out of jail and all of their charges dropped, and makes sure Alison is sent to an insane asylum, ridding them of her for good]].

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* DrivenToSuicide:
** Toby Cavanaugh kills himself near the end of "Flawless" after Emily rejects him upon discovering his "secret". (Though it turns out she was wrong about this; she mistakenly thought he was A, but said secret, which the girls only learn after his death, was actually that he used to molest his stepsister, Jenna.)
** During the TraumaCongaLine of ''Deadly'', [[spoiler:Emily]] comes dangerously close to jumping off a bridge to her death. Her horrified friends and Melissa narrowly talk her down, [[spoiler:and she wryly notes that this might not have even worked anyway, since, as a talented swimmer, she probably could have avoided drowning after she jumped]].
** In ''Vicious'', [[spoiler:Emily seemingly drowns herself for real, and her friends spend most of the book thinking she's dead. It's subverted, though, at the end, where it's revealed she was FakingTheDead in order to escape the law and track down Alison, which is the only way she can prove her and her friends' innocence]].



* EarlyInstallmentWeirdness: The main 16 books in the series are divided into four {{Story Arc}}s of four books each. Spencer is the Liar on the cover of the first book of each arc, and Hanna is on the second one each time. In the first arc, Aria is on the cover of the third book and Emily is on the fourth one, but in all subsequent arcs, Emily is on the third cover and Aria is on the fourth one.



* EvilMakesYouUgly: As a result of living in hiding as A during the third and fourth story arcs, [[spoiler:Alison]] has become this by the end of the series.
** In ''Deadly'', [[spoiler:she's been living in a seemingly abandoned barn, without being able to get proper nutrition or hygiene. By the time the Liars see her, she's bone-thin and one of her teeth has rotted away. Emily's narration describes it as being like if someone scribbled all over the Mona Lisa; "the most beautiful girl" has become "a twisted freak"]].
** Conversely, in ''Vicious'', [[spoiler:Ali's mom has been helping her hide from the law, and got them both fake IDs; in order to make sure that "Tiffany Day" doesn't at all resemble Alison [=DiLaurentis=], she's become fat and died her hair a mousy brown color. Hanna describes her as looking exactly like the kind of girl Ali herself would have once mocked mercilessly]].



** The reason [[spoiler:Hanna]] gets hit by a car in ''Perfect''. A sent her another threatening message, but accidentally used their regular phone instead of the blocked one [[spoiler:and Hanna recognized the number as belonging to her best friend, Mona Vanderwaal.]]

to:

** The reason [[spoiler:Hanna]] gets hit by a car in ''Perfect''. A sent sends her another threatening message, but accidentally used uses their regular phone instead of the blocked one one, [[spoiler:and Hanna recognized recognizes the number as belonging to her best friend, Mona Vanderwaal.]]



* HeWhoFightsMonsters: [[spoiler:Downplayed, since Alison was a "monster" from the get-go, framing her sister for being crazy and getting her institutionalized purely out of envy. Still, she started out seeking revenge only on Courtney for switching places with her and just wanted to reclaim her identity. However, after killing her sister but failing to get her life back (since her parents still believe her to be Courtney), Ali starts blaming and seeking revenge against more and more people for her problems who played a tangential role in causing them at best, and kills or tries to kill nearly a dozen more people in her quest for revenge against perceived slights against her.]]

to:

* HeWhoFightsMonsters: [[spoiler:Downplayed, since Alison was a "monster" from the get-go, framing her sister for being crazy and getting her institutionalized purely out of envy. Still, she started out seeking revenge only on Courtney for switching places with her and just wanted to reclaim her identity. However, after killing her sister but failing to get her life back (since her parents still believe her to be Courtney), Ali starts blaming and seeking revenge against more and more people for her problems who played a tangential role at best in causing them at best, her problems, and kills or tries to kill nearly a dozen more people in her quest for revenge against perceived slights against her.the process.]]



* InformedJudaism: Hanna is revealed to be Jewish in Pretty Little Secrets. There were no indications prior to this. It turns up again in ''Vicious'', [[spoiler:when Hanna and Mike get married. A rabbi presides over the wedding, and there is a chuppah.]]

to:

* InformedJudaism: Hanna is revealed to be Jewish in Pretty ''Pretty Little Secrets.Secrets''. There were no indications prior to this. It turns up again in ''Vicious'', [[spoiler:when Hanna and Mike get married. A rabbi presides over the wedding, and there is a chuppah.]]



* {{Jerkass}}: Alison definitely crosses into this trope. The reason why she is popular is because she is attractive, smart and charismatic. Also [[spoiler:her twin sister Courtney.]]

to:

* Interquel: ''Pretty Little Secrets'' was the eleventh book published in the series, coming out halfway through the third arc of the series, but takes place between the first and second arcs (between the fourth and fifth books), showing how the second A took over from the first one, who died at the end of the fourth book.
* {{Jerkass}}: Alison definitely crosses into this trope. The reason why she is popular is because she is attractive, smart and charismatic. Also [[spoiler:her twin sister Courtney.[[spoiler:More specifically, the real Alison is and always was this. Courtney in her "Ali" persona started off as a JerkWithAHeartOfGold, with most (but not all) of the "jerk" part coming from having to pretend to be Ali, but does devolve into this by the time she dies as a result of increasing stress and paranoia.]]



* LukeIAmYourFather: [[spoiler:Zig-zagged. Spencer thinks she might be adopted and finds a woman who claims to be her birth mother, but then it turns out that her parents are hers, and the woman she thought was her mother was in fact her gestational surrogate trying to get more money from the Hastings.]] Also, in a more straight example, [[spoiler:Spencer's dad is Alison and Courtney's father]].

to:

* LukeIAmYourFather: [[spoiler:Zig-zagged. LukeIAmYourFather:
** [[spoiler:Zig-zagged.
Spencer thinks she might be adopted and finds a woman who claims to be her birth mother, but then it turns out that her parents are hers, and the woman she thought was her mother was in fact her gestational surrogate trying to get more money from the Hastings.]] Also, in ]]
** In
a more straight example, [[spoiler:Spencer's dad is Alison and Courtney's father]].



* OrWasItADream: Hanna is visited by Alison while she is in the hospital in a weird surreal dream-like state leaving us unsure where it was real or not but later it's revealed that [[spoiler:Alison really did visit Hanna because she was still alive.]]

to:

* OrWasItADream: Hanna is visited by Alison while she is in the hospital in a weird surreal dream-like state leaving us unsure where it was real or not but not. It's later it's revealed that [[spoiler:Alison (the real one) really did visit Hanna because she was she's still alive.]]



* ProductPlacement: In the books, which constantly name-drop designers, brands, and stores.
* ReallyGetsAround: Trista has this reputation in the books.
** Erin Bang Bang in Burned
* RedHerring: [[spoiler:First A was thought to be Ali, then Toby Cavanaugh, then Emily thought it was Maya and Spencer thought it was her sister Melissa. It was finally revealed to be Mona, but then a ''new'' A started threatening them.]]
** [[spoiler:The second A was revealed to be a man the girls hadn't even spoken to,]] but it turns out [[spoiler:that was wrong, too. It was Ali.]]

to:

* ProductPlacement: In the books, Prequel: ''Ali's Pretty Little Lies'', which constantly name-drop designers, brands, fleshes out the series backstory by taking place before and stores.
* ReallyGetsAround: Trista has this reputation in
leading up to the books.
** Erin Bang Bang in Burned
* RedHerring: [[spoiler:First A was thought to be Ali, then Toby Cavanaugh, then Emily thought
time that Ali died. [[spoiler:Most of it was Maya and Spencer thought it was her sister Melissa. It was finally revealed to be Mona, but then a ''new'' A started threatening them.is told from Courtney's point of view, up until she's killed by Alison; afterward, Ali takes over the narrative for the final chapter.]]
* ProductPlacement: The books constantly name-drop designers, brands, and stores.
* ReallyGetsAround: Trista from the first arc and "Erin Bang Bang" in ''Burned'' have this reputation.
* RedHerring:
** [[spoiler:First A was thought to be Ali, then Toby Cavanaugh, then Emily thought it was Maya and Spencer thought it was her sister Melissa. It was finally revealed to be Mona, but then a ''new'' A starts threatening them.]]
** [[spoiler:The second A was revealed seems to be a man the girls hadn't even spoken to,]] but it turns out [[spoiler:that was wrong, too. It was It's Ali.]]



** [[spoiler:The third arc has the girls in each book assume someone who is connected to each of their dark secrets over the summer is the third A and then at the end it is revealed that it isn't]]

to:

** [[spoiler:The third arc has the girls in each book assume someone who is connected to each of their dark secrets over the summer is the third A and A, then at the end it is revealed of each book seemingly shows that this was not the case. But then ''Deadly'' reveals that this ''was'' true, but it isn't]]wasn't the person any of them expected. It was a guy that each of them met during the summer, all four of whom turn out to be the same person: Nick "Tripp" Maxwell.]]



* {{Revenge}}: This is Mona's primary motivation [[spoiler:leading her to become A.]]
** This is essentially the motive of all As
* RichBitch: Hanna's mom in the books.
* RomanticTwoGirlFriendship: Emily has this with both Courtney and Alison at different points in the books.
** She also has this with Kelsey in ''Ruthless''.
* SchoolgirlLesbians: Emily fits this trope with [[EvenTheGirlsWantHer more than a few girls]] ...
** Emily and Maya, Emily and Trista, Emily and Alison, Emily and Courtney, Emily and Kelsey, Emily and Jordan.
* SecretDiary: Alison wrote all of her friend's secrets in a diary before her death. [[spoiler:Mona had found the diary among Alison's (actually Courtney at that time) things which is how she knew some of their secrets.]]
* SecretIdentity: A is the identity of the person who happens to be blackmailing the girls. In the books, [[spoiler:the first A is Mona and the second one is Alison.]]
* SecretRelationship: Aria and Ezra.
** [[spoiler:Ian and Alison]]

to:

* {{Revenge}}: This is Mona's the primary motivation [[spoiler:leading motive of all the different A's, though each of them wants revenge for different reasons.
* RichBitch: Hanna's mom.
* RomanticTwoGirlFriendship: Emily has this with both [[spoiler:Courtney and Alison]] at different points in the books. She also has this with Kelsey in ''Ruthless''.
* SchoolgirlLesbians: Emily fits this trope with [[EvenTheGirlsWantHer more than a few girls]]: Maya, Trista, Alison, [[spoiler:Courtney]], Kelsey, and Jordan.
* SecretDiary: Alison wrote all of
her to become A.friends' secrets in a diary before her death. [[spoiler:Mona finds the diary among Alison's (actually Courtney at that time) things, which is how she knew so many of their secrets.]]
** This is essentially the motive of all As
* RichBitch: Hanna's mom in the books.
* RomanticTwoGirlFriendship: Emily has this with both Courtney and Alison at different points in the books.
** She also has this with Kelsey in ''Ruthless''.
* SchoolgirlLesbians: Emily fits this trope with [[EvenTheGirlsWantHer more than a few girls]] ...
** Emily and Maya, Emily and Trista, Emily and Alison, Emily and Courtney, Emily and Kelsey, Emily and Jordan.
* SecretDiary: Alison wrote all of her friend's secrets in a diary before her death. [[spoiler:Mona had found the diary among Alison's (actually Courtney at that time) things which is how she knew some of their secrets.]]
* SecretIdentity: A is the identity of the person who happens to be blackmailing the girls. In the books, [[spoiler:the The first A is Mona [[spoiler:Mona]] and the second one is Alison.]]
[[spoiler:Alison, who later is revealed to also have an accomplice, "Helper A", her boyfriend Nick]].
* SecretRelationship: SecretRelationship:
**
Aria and Ezra.
** [[spoiler:Ian and Alison]]"Alison" (Courtney), though it's later revealed that Courtney wasn't actually into him and was dating him as a cover for a relationship with someone else.]]



* ShipperOnDeck: Mike is a big supporter of his sister Aria with his best friend Noel Kahn and was thrilled when they finally started dating.

to:

* ShipperOnDeck: Mike is a big supporter of his sister Aria with his best friend Noel Kahn Kahn, and was is thrilled when they finally started start dating.



* TeacherStudentRomance: Aria and Ezra.
** And her dad Byron and his student Merdith.
* TeenPregnancy: [[spoiler:Emily ended up pregnant after losing her virginity to Isaac, and ended up having a baby over the summer, this is one of the things that A tortures her about]]

to:

* TeacherStudentRomance: StoryArc: There are four main ones, made up of four books each, though the third and fourth arcs arguably blend into one larger eight-book story.
** Books 1-4: Trying to figure out who A is, with the secondary goal of finding Ali's killer. [[spoiler:The arc concludes with them learning that A is Mona, but not having a decisive answer for who killed Ali. (They think they know, but the next arc reveals that they're wrong.)]]
** Books 5-8: Learning the second A's identity, and determining Ali's killer for real this time. [[spoiler:Both of them are the same person: the ''real'' Alison DiLaurentis, who murdered the "Ali" that the Liars knew, actually her twin sister Courtney.]]
** Books 9-12: Gradually revealing the Liars' "summer secrets" (collectively and individually), and learning who the third A is. [[spoiler:They eventually conclude that A is still Alison, who survived their encounter at the end of the previous arc, but realize that she also has an accomplice, "Helper A".]]
** Books 13-16: Tracking down [[spoiler:Ali]] and "Helper A" (and discovering the latter's identity) to clear their names once and for all after their secrets resurface. [[spoiler:Helper A is Nick Maxwell, who is arrested at the end of Book 14, while Ali herself is apprehended in the final installment.]]
* TeacherStudentRomance:
**
Aria and Ezra.
** And her dad Byron and Aria's dad, Byron, likewise has one with his student own student, Merdith.
* TeenPregnancy: [[spoiler:Emily ended up pregnant after losing her virginity to Isaac, and ended up having a baby over the summer, this summer. This is one of the things that A tortures her about]]about in the third arc.]]



* WeCanRuleTogether: The first A, [[spoiler:Mona]], makes this offer fairly literally to Spencer when the latter learns her identity, stating that they can both be A and rule Rosewood Day together, with Spencer taking her "rightful place" as the queen bee of the school. Spencer, naturally, refuses and notes how crazy this is, resulting in A attempting to murder her.
* WickedStepmother: This is subverted with Isabel because Hanna dislikes her mainly out of her jealously for her father finding a new family and preferring them to her.



* WickedStepmother: This is subverted with Isabel because Hanna dislikes her mainly out of her jealously for her father finding a new family and preferring them to her.

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** Hanna has one with Alison while she is in the hospital. [[spoiler:Later subverted , as Alison (the real one) was alive, and visited Hanna when she was drifting in and out of sleep.]]

to:

** Hanna has one with Alison while she is in the hospital. [[spoiler:Later subverted , subverted, as Alison (the real one) was alive, and visited Hanna when she was drifting in and out of sleep.]]



** The second A, of books 5-8, turns out to be [[spoiler:the ''real'' Alison [=DiLaurentis=], who has been alive the whole time and, unbeknownst to nearly everyone in town, had a twin sister named Courtney. Courtney was the "Ali" the Liars knew and were best friends with, and she's the one who actually died.]]
** [[spoiler:Alison is still A for the final 8 books, but she also has an accomplice, "Helper A". He turns out to be Nick Maxwell, a.k.a. Tripp, Iris's boyfriend. Furthermore, books 9-12 detail how each of the girls met a seemingly-innocuous guy during the summer; Book 14, "Deadly", reveals that all four of these boys were actually Nick in disguise.]]
* TheDragon: Mona to Hanna.
* [[DroppedABridgeOnHer: [[spoiler:Jenna's murder at the hands of Alison occurs very abruptly at the end of "Killer".]]

to:

** The second A, of books 5-8, turns out to be [[spoiler:the ''real'' Alison [=DiLaurentis=], who has been alive the whole time and, unbeknownst to nearly everyone in town, had a twin sister named Courtney. Courtney was the "Ali" the Liars knew and were as their best friends with, friend, and she's the one who actually died.]]
** [[spoiler:Alison is still A for the final 8 books, but she also has an accomplice, "Helper A". He turns out to be Nick Maxwell, a.k.a. Tripp, Iris's whom Iris and Courtney both believe at different times to be their boyfriend, but is actually Ali's boyfriend. Furthermore, books 9-12 detail how each of the girls met a seemingly-innocuous guy during the summer; their separate summers; Book 14, "Deadly", reveals that all four of these boys were actually Nick in disguise.]]
* TheDragon: Mona to Hanna.
Hanna at the beginning of the series. [[spoiler:She turns out to be a DragonWithAnAgenda, with said Agenda being getting revenge on Hanna and the other Liars for the Jenna Thing.]]
* [[DroppedABridgeOnHer: DroppedABridgeOnHer: [[spoiler:Jenna's murder at the hands of Alison occurs very abruptly at the end of "Killer".]]



* EverybodyKnewAlready: The Jenna Thing turns out to be this because Courtney lied about it. [[spoiler:She claimed that no one else but them knew and swore them to secrecy. It turns out that Jenna and Toby also knew who was behind it. Mona also knew it about which contributed to her dislike of the girls because she had been friends with Jenna.]]

to:

* EverybodyKnewAlready: The Jenna Thing turns out to be this because Courtney Ali lied about it. [[spoiler:She claimed that no one else but them knew and swore them to secrecy. It turns out that Jenna and Toby also knew who was behind it. Mona also knew it about it, which contributed to her dislike of the girls and desire to become A to get revenge on them because she had been friends with Jenna.]]



** TheLancer: Aria



** Spencer qualifies for both TheLancer and TheSmartGuy.

to:

** Spencer qualifies and Aria both qualify for both TheLancer and TheSmartGuy.TheSmartGuy in different ways.



* GambitRoulette: It is revealed in ''Unbelievable'' that [[spoiler:Mona Vanderwaal was A and planned everything that happened to them all along.]]
** Then in ''Deadly'' it is revealed that [[spoiler:Nick/Tripp was all the guys each of the girls met and caused their summer secrets]]
* GoodCannotComprehendEvil: Emily is unable to understand why [[spoiler: Real Ali would want to burn them, much to Ali's exasperation because unlike Courtney, she didn't even know them!]]
* GirlOnGirlIsHot: This was the reaction of most of the Typical Rosewood Boys after Emily is outed by A
* GirlPosse: The four girls are this to Alison before her death. Before she befriended the protagonists, Alison had another girl posse with two girls named Riley Wolfe and Naomi Zeigler [[spoiler:Courtney ditched them after taking over her sister's life because she didn't know the secrets and inside jokes the real Alison did]]. Hanna forms one of her own later after [[spoiler:Mona's demise]] with her stepsister Kate and Alison's two former cronies.
* TheGloriousWarOfSisterlyRivalry: Spencer and her sister Melissa.
* HeKnowsTooMuch: The reason [[spoiler:Hanna]] gets hit by a car in ''Perfect''. A sent a threatening message to [[spoiler:Hanna]], but used their regular phone instead of the blocked one [[spoiler:and Hanna recognized the number as belonging to her best friend, Mona Vanderwaal.]]
** [[spoiler:This is the second A's reason for killing Ian and Jenna and the third A's for killing Tabitha]]
* HeWhoFightsMonsters: [[spoiler:Alison. She started out just wanting revenge on Courtney but then started to get in too deep and started to kill other people.]]
* HiddenVillain: A is extremely skilled at managing to avoid having their identity revealed while conducting blackmail and other methods to mess with the main characters. In the books their identity was revealed in the fourth, eighth, and fourteenth books.
* HotTeacher: Ezra
* IAteWhat: Aria is a vegetarian, upon realizing in horror on her second week in Iceland that she ate a puffin.
* {{Irony}}: The reason that Alison's parents [[spoiler:hid Alison's twin sister, Courtney from the world]] was because they thought that [[spoiler:Courtney was crazy.]] Tragically, it turned out that [[spoiler:Alison, their "perfect little girl", was the one that would go around blackmailing people, ruining lives, tearing apart families, and killing people without even showing the slightest sign of remorse.]] The worst part? [[spoiler: Their "perfect little girl" never would have gone on her rampage had she not been accidentally subjugated to the lifestyle that her sister had grown up in--the one that ''they decided to put her through''.]]
** It gets worse [[spoiler:It turns out that Courtney was never the crazy one in the first place, it was Alison who purposefully made it seem like Courtney wanted to kill her in order to get her out of the way.]]
* InformedJudaism: Hanna is revealed to be Jewish in Pretty Little Secrets. There were no indications prior to this. [[spoiler:It turns up again in ''Vicious'', when Hanna and Mike get married. A rabbi presides over the wedding, and there is a chuppah.]]
* IntelligenceEqualsIsolation: In the books, this was the reason why Aria didn't fit in with her peers because she was much more interested in things such as philosophy and abstract art. This left her friendless until meeting Alison and the other girls.

to:

* GambitRoulette: GambitRoulette:
**
It is revealed in ''Unbelievable'' that [[spoiler:Mona Vanderwaal was is A and has planned everything that that's happened to them the girls (so far) all along.]]
** Then in ''Deadly'' it is revealed ''Deadly'', we learn that [[spoiler:Nick/Tripp was all the guys guy each of the girls met during their summers (all four of them) and caused their respective summer secrets]]
secrets]].
* GoodCannotComprehendEvil: Emily is unable to understand why [[spoiler: Real [[spoiler:Real Ali would hate them so much and want to burn kill them, much to Ali's exasperation because unlike Courtney, since she didn't even know them!]]
* GirlOnGirlIsHot: This was the reaction of most of the Typical Rosewood Boys after Emily is outed by A
* GirlPosse: The four girls are this to Alison before her death. Before she befriended the protagonists, Alison had another girl posse with two girls named Riley Wolfe and Naomi Zeigler [[spoiler:Courtney ditched
them after taking over personally. Ali mocks her sister's life because she didn't know the secrets and inside jokes the real Alison did]]. Hanna forms one of her own later after [[spoiler:Mona's demise]] with her stepsister Kate and Alison's two former cronies.
* TheGloriousWarOfSisterlyRivalry: Spencer and her sister Melissa.
* HeKnowsTooMuch: The reason [[spoiler:Hanna]] gets hit by a car in ''Perfect''. A sent a threatening message to [[spoiler:Hanna]], but used their regular phone instead of the blocked one [[spoiler:and Hanna recognized the number as belonging to her best friend, Mona Vanderwaal.
for it.]]
** [[spoiler:This * GirlOnGirlIsHot: This is the second A's reaction of most of the Typical Rosewood Boys after Emily is outed by A.
* GirlPosse:
** The four main girls were this to Alison before her death.
** Before she befriended the protagonists, Alison had another girl posse with two girls named Riley Wolfe and Naomi Zeigler, before suddenly abandoning them for not much
reason for killing Ian and Jenna and at all in favor of the third A's for killing Tabitha]]
* HeWhoFightsMonsters: [[spoiler:Alison. She started out just wanting revenge on Courtney but then started to get in too deep and started to kill other people.]]
* HiddenVillain: A is extremely skilled at managing to avoid having their identity revealed while conducting blackmail and other methods to mess with the main characters. In the books their identity was revealed in the fourth, eighth, and fourteenth books.
* HotTeacher: Ezra
* IAteWhat: Aria is a vegetarian, upon realizing in horror on her second week in Iceland that she ate a puffin.
* {{Irony}}: The reason that Alison's parents [[spoiler:hid Alison's twin sister, Courtney from the world]] was because they thought that
Liars. [[spoiler:Courtney was crazy.]] Tragically, it turned out ditched them after taking over her sister's life because she didn't know the secrets and inside jokes that [[spoiler:Alison, their "perfect little girl", was the one that would go around blackmailing people, ruining lives, tearing apart families, real Alison did and killing people without even showing the slightest sign of remorse.]] The worst part? [[spoiler: Their "perfect little girl" never would have gone on her rampage had she not been accidentally subjugated to the lifestyle that her sister had grown up in--the one that ''they decided to put her through''.found out as an impostor quickly.]]
** It Hanna forms one of her own after [[spoiler:Mona's demise]] for a short while with Naomi, Riley, and her stepsister Kate.
* TheGloriousWarOfSisterlyRivalry: Spencer and her older sister Melissa for the first half of the series, though they've mostly buried the hatchet by the second half.
* HeKnowsTooMuch:
** The reason [[spoiler:Hanna]]
gets worse hit by a car in ''Perfect''. A sent her another threatening message, but accidentally used their regular phone instead of the blocked one [[spoiler:and Hanna recognized the number as belonging to her best friend, Mona Vanderwaal.]]
** [[spoiler:This is the reason that the new A (Ali) kills Ian, Jenna, and Tabitha.]]
* HeWhoFightsMonsters: [[spoiler:Downplayed, since Alison was a "monster" from the get-go, framing her sister for being crazy and getting her institutionalized purely out of envy. Still, she started out seeking revenge only on Courtney for switching places with her and just wanted to reclaim her identity. However, after killing her sister but failing to get her life back (since her parents still believe her to be Courtney), Ali starts blaming and seeking revenge against more and more people for her problems who played a tangential role in causing them at best, and kills or tries to kill nearly a dozen more people in her quest for revenge against perceived slights against her.]]
* HiddenVillain: "A" is an alias used by multiple people, and all of them are extremely skilled at avoiding having their identity revealed, while conducting blackmail and other methods to mess with the main characters. Their identities are revealed in the fourth, eighth, and fourteenth books, and they're finally taken down for good in the sixteenth and final installment in the series.
* HotTeacher: Ezra Fitz, whom Aria falls for and dates in the first story arc.
* IAteWhat: Aria is a vegetarian, and realizes in horror during her second week in Iceland that she ate a puffin.
* {{Irony}}: The reason that Alison's parents [[spoiler:hid Alison's twin sister, Courtney, from the world]] was because they thought that [[spoiler:Courtney was crazy.]] Tragically, it turns out that [[spoiler:Alison, their "perfect little girl", was the one that would go around blackmailing people, ruining lives, tearing apart families, and committing numerous counts of murder without even showing the slightest sign of remorse.]] The worst part?
[[spoiler:It turns out that Courtney was never the crazy one in the first place, it was Alison having been framed by her sister who purposefully made it seem like successfully tricked them into believing this, and Courtney wanted was much closer all along to kill her in order to get her out of the way."perfect daughter" that they falsely believed Alison to be.]]
* InformedJudaism: Hanna is revealed to be Jewish in Pretty Little Secrets. There were no indications prior to this. [[spoiler:It It turns up again in ''Vicious'', when [[spoiler:when Hanna and Mike get married. A rabbi presides over the wedding, and there is a chuppah.]]
* IntelligenceEqualsIsolation: In the books, this This was the reason why Aria didn't fit in with her peers in the backstory, because she was much more interested in things such as like philosophy and abstract art. This left her friendless until meeting Alison and the other girls.



* LesYay: [[InvokedTrope Invoked]] by Alison to manipulate Emily.
* LipstickLesbian: Maya, Emily and Trista.
* LovableSexManiac: Aria's younger brother Mike is a textbook HormoneAddledTeenager and constantly thinks of sex, but is rather funny than creepy.

to:

* LesYay: [[InvokedTrope Invoked]] by Alison [[spoiler:(both versions of her)]] to manipulate Emily.
* LipstickLesbian: Maya, Emily Emily, and Trista.
* LovableSexManiac: Aria's younger brother Mike is a textbook HormoneAddledTeenager and constantly thinks of sex, but is rather funny than as opposed to creepy.

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** In ''Twisted'', [[spoiler:the girls confront someone who they think is Alison, and Aria, believing she was going to kill them, pushed her in self-defense, causing her to fall to her death. Though it's later subverted, since ''Burned'' reveals that the girl, Tabitha, was killed by a blow to the head at close range, NOT from a fall.]]

to:

** In ''Twisted'', [[spoiler:the girls confront someone who they think is Alison, and Aria, believing she was going to kill them, pushed pushes her in self-defense, causing her to fall to her death. Though it's later subverted, since ''Burned'' reveals that the girl, Tabitha, was killed by a blow to the head at close range, NOT range (which was very much not accidental), not from a the fall.]]



* BreakTheCutie: Jenna is teased constantly by Alison and her friends, abused by her stepbrother, and then blinded by a prank gone wrong. She never holds the teasing against Aria and the others, though, [[spoiler:the prank was her idea, conceived in an effort to take her stepbrother out of the picture.]],

to:

* BreakTheCutie: Before the start of the series, Jenna is was teased constantly by Alison and her friends, abused by her stepbrother, and then blinded by a prank gone wrong. She never holds the teasing against Aria and the others, though, [[spoiler:the [[spoiler:and the prank was her idea, conceived in an effort to take her stepbrother out of the picture.]],]]



** Much more tragically is [[spoiler:is Courtney trying to convince her parents that Ali is making her look crazy to get rid of her]].

to:

** Much more tragically is [[spoiler:is Courtney [[spoiler:Courtney trying to convince her parents that Ali is making her look crazy to get rid of her]].



* DaddysGirl: Hanna used to be like this with her dad before he remarried. However, after he married Isabel he preferred Kate to her causing her many insecurities.
** In ''Twisted'' she once again becomes her father's favorite after her success with helping him run his political campaign.

to:

* DaddysGirl: Hanna used to be like this with her dad before he remarried. However, after he married Isabel Isabel, he preferred seems to prefer Kate to her her, causing her many insecurities.
** In ''Twisted'' she once again becomes her father's favorite after her success with helping him run his political campaign.
insecurities.



* DeadPersonConversation: Hanna has one with Alison while she is in the hospital. Subverted [[spoiler:because Alison was really alive at the time and visited Hanna when she was in a state between waking up and sleeping.]]
** Later Aria has a real one using a medium to talk to Ali [[spoiler:Actually, Courtney]] who wrote down the cryptic but accurate identity of her killer [[spoiler:Ali killed Ali]]
* DeadlyPrank: The Jenna Thing is based off this. The girls are convinced to play a prank on Toby involving a firework. It backfires leading to Jenna's blindness and Toby taking the fall for it. [[spoiler:Jenna had actually conspired with Courtney to get rid of her stepbrother because he was abusing her. The firework went off at the wrong time causing all the chaos after it.]]
* DisappearedDad: Hanna's and Emily's.
** Emily's is around he just seems to always agree with his wife
* DisneyVillainDeath: [[spoiler:After Spencer rejects her offer to become A with her, Mona attempts to kill Spencer which leads to Spencer pushing Mona to her death over a cliff.]]
* DisproportionateRetribution: Alison is basically ruining the Liars' lives and trying to kill them because [[spoiler:they unwittingly validated her sister's deception. They didn't even know she had a twin and genuinely thought they were talking to her.]]
* TheDogWasTheMastermind: A's identity fits this because at first the girls suspect A is Alison but after she is discovered to be dead leading them to suspect Toby to be A. [[spoiler:It is actually Mona who was supposed to be best friends with Hanna which comes as a surprise to them because they never considered her at all. The second A turns out to be Alison which came as a huge shocker because it was revealed that she had killed her twin sister Courtney who was impersonating her at the time.]]

to:

* DeadPersonConversation: DeadPersonConversation:
**
Hanna has one with Alison while she is in the hospital. Subverted [[spoiler:because [[spoiler:Later subverted , as Alison (the real one) was really alive at the time alive, and visited Hanna when she was drifting in a state between waking up and sleeping.out of sleep.]]
** Later Later, Aria has a real one via using a medium to talk to Ali [[spoiler:Actually, Courtney]] [[spoiler:(or rather, the Ali she knew, who wrote was actually Courtney)]], who writes down the cryptic but accurate cryptic-but-accurate identity of her killer [[spoiler:Ali killer: [[spoiler:"Ali killed Ali]]
Ali" (as in, the real Alison killed "their" Ali). Since Aria didn't know at the time that Ali had a twin, the message instead causes her to think for a while that Ali committed suicide]].
* DeadlyPrank: The Jenna Thing is based off from the backstory was this. The girls are Ali convinced the other four girls to play a prank on Toby involving a firework. It backfires backfired, leading to Jenna's blindness and Toby taking the fall for it. it after Ali blackmailed him. [[spoiler:Jenna had actually conspired with Courtney "Ali" (Courtney) to get rid of her stepbrother because he was abusing molesting her. The firework went off at the wrong time time, causing all the chaos after it.]]
* DisappearedDad: Hanna's and Emily's.
** Emily's is around he just seems to always agree with his wife
* DisneyVillainDeath: [[spoiler:After Spencer rejects her Mona's offer to become A together with her, Mona attempts to kill Spencer her, which leads to Spencer accidentally pushing Mona to her death over a cliff.]]
* DisproportionateRetribution: Alison [[spoiler:Alison]] is basically ruining the Liars' lives and trying to kill them because [[spoiler:they unwittingly validated her sister's deception. TwinSwitch. They didn't even know she had ''had'' a twin and genuinely thought they were talking to her.]]
* TheDogWasTheMastermind: A's identity fits this because at first At first, the girls understandably suspect A that "A" is Alison (which was clearly the point), but soon after she they first start receiving A's messages, Ali is discovered to be dead leading them to suspect Toby to be A. [[spoiler:It found dead, and they cycle through a lot of suspects. There are a few different people acting as A throughout the series, and they all qualify as this.
** The first A, of the first four books,
is [[spoiler:Mona Vanderwaal, supposedly Hanna's best friend, who actually Mona who was supposed to be best friends with Hanna which comes as a surprise to them because they never considered her at all. wants revenge on the girls for the Jenna Thing.]]
**
The second A A, of books 5-8, turns out to be [[spoiler:the ''real'' Alison which came as a huge shocker because it was revealed that she [=DiLaurentis=], who has been alive the whole time and, unbeknownst to nearly everyone in town, had killed her a twin sister named Courtney. Courtney was the "Ali" the Liars knew and were best friends with, and she's the one who was impersonating her at actually died.]]
** [[spoiler:Alison is still A for
the time.final 8 books, but she also has an accomplice, "Helper A". He turns out to be Nick Maxwell, a.k.a. Tripp, Iris's boyfriend. Furthermore, books 9-12 detail how each of the girls met a seemingly-innocuous guy during the summer; Book 14, "Deadly", reveals that all four of these boys were actually Nick in disguise.]]



* [[DroppedABridgeOnHer: [[spoiler:Jenna's murder at the hands of Alison was abrupt and mentioned very briefly in the books.]]

to:

* [[DroppedABridgeOnHer: [[spoiler:Jenna's murder at the hands of Alison was abrupt and mentioned occurs very briefly in abruptly at the books.end of "Killer".]]



* [[spoiler: EvilTwin: In ''Wanted'', Ali reveals that she had a twin, Courtney, who was evil. However, it turns out that she's just as evil.]]
* EruditeStoner: Reefer, Spencer's current love interest. At first she think he's just some creepy stoner from Princeton who by some miracle got into the school, then it's revealed he's actually a ''TeenGenius'' majoring in Quantum Physics who grows his own pot and keeps it neatly in alphabetical order, Spencer can't help but be impressed.

to:

* [[spoiler: EvilTwin: [[spoiler:EvilTwin: In ''Wanted'', Ali Alison reveals that she had a twin, Courtney, who was evil. However, it turns out the "Ali" that she's just as the Liars were friends with. The Liars believe by the end of the book that ''both'' sisters were this, but ''Ali's Pretty Little Lies'' shows that the real Alison herself was actually the evil twin, and Courtney, though bitchy, was not evil.]]
* EruditeStoner: Reefer, one of Spencer's current later love interest. interests. At first she think he's just some creepy stoner from Princeton who by some miracle got into the school, but then it's revealed he's actually a ''TeenGenius'' majoring in Quantum Physics who grows his own pot and keeps it neatly in alphabetical order, order. Spencer can't help but be impressed.



* FalseFriend: [[spoiler:Mona befriended Hanna only as a part of her elaborate revenge plot as A. After Mona's death this leaves Hanna devastated because she thought Mona was a good friend of hers. Alison pretends to befriend the girls in the eighth book only so she can attempt to kill them in revenge because she felt like they were involved in stealing her life.]]

to:

* FalseFriend: FalseFriend:
**
[[spoiler:Mona befriended Hanna only as a part of her elaborate revenge plot as A. After Mona's death this leaves death, Hanna is devastated because she thought Mona to realize that their close friendship was a good friend of hers. Alison never genuine on Mona's end.]]
** [[spoiler:Alison
pretends to befriend the girls in the eighth book only so she can attempt to kill them in revenge because she felt like they were involved in stealing her life.]]



* FourTemperamentEnsemble: Hanna - '''[[color:maroon:sanguine]]''', Spencer - '''[[color:orange:choleric]]''', Emily - '''[[color:green:phlegmatic]]''', Aria - '''[[color:black:melancholic]]''', Alison - '''eclectic'''.

to:

* FourTemperamentEnsemble: Hanna - '''[[color:maroon:sanguine]]''', Spencer - '''[[color:orange:choleric]]''', Emily - '''[[color:green:phlegmatic]]''', Aria - '''[[color:black:melancholic]]''', Alison - '''eclectic'''.'''leukine'''.



* FoodSlap: Ben spills his drink on Emily after finding out she cheated on him with [[spoiler:Maya]].
* {{Foreshadowing}}: [[spoiler:"Mona always knew the best dirt on people" less than forty pages into the first book will jump straight out at you on a reread.]]
** There are hints dropped in ''Unbelievable'' that Ali [[spoiler:Has a twin]].

to:

* FoodSlap: Ben spills his drink on Emily after finding out she cheated on him with [[spoiler:Maya]].
Maya.
* {{Foreshadowing}}: {{Foreshadowing}}:
**
[[spoiler:"Mona always knew the best dirt on people" people"]] less than forty pages into the first book will jump straight out at you on a reread.]]
reread.
** There are hints dropped in ''Unbelievable'' that Ali [[spoiler:Has [[spoiler:has a twin]].twin]], which isn't confirmed until ''Wanted''.



* TraumaInducedAmnesia: Spencer has no memory of what happened the night that Alison disappeared. [[spoiler:It was revealed Spencer had a similar episode to this when she was younger because due to an illness. What actually happened was that Spencer got into a fight with Alison over Ian. This caused Spencer to push Ali to the ground before leaving the area. After Ali disappeared later that same night, Spencer then repressed the memory because of the trauma. When she later remembers this by the time of the series, she starts to believe she may have killed Alison in this incident, and only later does she remember the truth and realize that A was messing with her]].

to:

* TraumaInducedAmnesia: Spencer has no memory of what happened the night that Alison disappeared. [[spoiler:It was revealed Spencer We later learn she had a similar episode to this when she was younger because due to an illness. What actually happened was that was: Spencer got into a fight with Alison over Ian. This caused Spencer to push Ali Ian, and pushed her to the ground before leaving the area. After Ali disappeared later that same night, Spencer then repressed the memory because of the trauma. When she later remembers part of this by the time of the series, she starts to believe she may have killed Alison in this incident, and only later does she remember recall the truth full encounter and realize that A was messing with her]].her.



* [[spoiler:TwinSwitch:Alison's twin sister Courtney stole her identity when the latter was home from the mental hospital one weekend, causing Ali to be taken back to the hospital in Courtney's place and under her name.]]

to:

* [[spoiler:TwinSwitch:Alison's [[spoiler:TwinSwitch: Alison's twin sister Courtney stole her identity when the latter was home from the mental hospital one weekend, causing Ali to be taken back to the hospital in Courtney's place and under her name.]]



** By the end of ''Wanted'', the Liars have a mild version of this about their friendship with Ali. [[spoiler:In her JustBetweenYouAndMe note to them, the real Alison claims that Courtney, who was the "Ali" the girls knew, only chose such "uncool" people like them to be her new friends in order to spite Alison, since they were girls that the real Ali would never have looked twice at. ''Ali's Pretty Little Lies'' reveals that, though Ali did genuinely believe this, it wasn't true, and Courtney really did love her friends; tragically, though, she'd increasingly driven them away from her by that point, and never got the chance to make up with them before Ali killed her]].
* WoobieDestroyerOfWorlds: [[spoiler:Courtney [=DiLaurentis=]]]. [[spoiler:At first, she and her twin sister, Alison, were the best of friends and as close as could be; however, gradually, Ali's more intense personality caused the more chill, comforting Courtney to become the more popular sister. Ali got jealous of this, and would threaten Courtney into pretending to be her, but always denied it when Courtney told their parents about it, causing the latter to come off as crazy. Courtney was wrongly diagnosed as a paranoid schizophrenic, and spent three years of her life in a mental hospital starting at the age of ''nine''. Her parents sort of forgot about her and treated her like she was unwanted when she came home to visit, staying in a dinky guestroom and not being allowed outside. Her family even changed their last name from [=Day-DiLaurentis=] to [=DiLaurentis=], because of the shame of having a child in a mental institution. Is it any wonder Courtney wanted to be free and have her old life back? She eventually does manage to switch places with Alison and form her own group of close friends, but gradually, her paranoia and stress over her sister potentially being released from the hospital and coming back to torment her causes her to treat her friends like shit and alienate them, and finally, Ali does indeed come home and kills Courtney for stealing her life, even though Alison started the whole ordeal and Courtney only wanted the happy life she deserved in the first place.]]

to:

** By the end of ''Wanted'', the Liars have a mild version of this about their friendship with Ali. [[spoiler:In her JustBetweenYouAndMe note to them, the real Alison claims that Courtney, who was the "Ali" the girls knew, only chose such "uncool" people like them to be her new friends in order as a way to spite Alison, since they were girls that the real Ali would never have looked twice at. ''Ali's Pretty Little Lies'' reveals that, though Ali did genuinely believe this, it wasn't reeally true, and Courtney really truly did love her friends; tragically, though, she'd increasingly driven them away from her by that point, and never got the chance to make up with them before Ali killed her]].
* WoobieDestroyerOfWorlds: [[spoiler:Courtney [=DiLaurentis=]]]. [[spoiler:At first, she and her twin sister, Alison, were the best of friends and as close as could be; however, gradually, Ali's more intense personality caused the more chill, comforting Courtney to become the more popular sister. Ali got jealous of this, and would threaten Courtney into pretending to be her, but always denied it when Courtney told their parents about it, causing the latter to come off as crazy. Courtney was wrongly diagnosed as a paranoid schizophrenic, and spent three years of her life in a mental hospital starting at the age of ''nine''. Her parents sort of forgot about her and treated her like she was unwanted when she came home to visit, staying in a dinky guestroom and not being allowed outside. Her family even changed their last name from [=Day-DiLaurentis=] to [=DiLaurentis=], because of the shame of having a child in a mental institution. Is it any wonder Courtney wanted to be free and have her old life back? She eventually does manage to switch places with Alison and form her own group of close friends, but gradually, her paranoia and stress over her sister potentially being released from the hospital and coming back to torment her causes her to treat her friends like shit and alienate them, and finally, them. Finally, Ali does indeed come home and kills Courtney for stealing her life, even though Alison started the whole ordeal and Courtney only wanted the happy life she deserved in the first place.]]

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* AccidentalMurder: In ''Twisted'' [[spoiler:the girls confront someone who they think is Alison and Aria believing she was going to kill them pushed her in self-defense causing her to fall to her death.]]
** Subverted [[spoiler:It's revealed in the latest book that she was killed by a blow to the head at close range NOT from a fall.]]

to:

* AccidentalMurder: AccidentalMurder:
**
In ''Twisted'' ''Unbelievable'', [[spoiler:Mona]] tries to kill Spencer after the latter discovers that she's A. Spencer, in self-defense, closes her eyes and pushes A away from her, causing A to go over the edge of the cliff and break her neck in the fall.
** In ''Twisted'',
[[spoiler:the girls confront someone who they think is Alison Alison, and Aria Aria, believing she was going to kill them them, pushed her in self-defense self-defense, causing her to fall to her death.]]
** Subverted [[spoiler:It's revealed in the latest book
death. Though it's later subverted, since ''Burned'' reveals that she the girl, Tabitha, was killed by a blow to the head at close range range, NOT from a fall.]]



* AlwaysIdenticalTwins: [[spoiler:The person who died was actually Alison's identical twin Courtney who Alison killed in a fit of rage for stealing her identity. Courtney is even buried under her twin's name.]]
* AlwaysSomeoneBetter: Spencer feels she is constantly under her older sister [[TheGloriousWarOfSisterlyRivalry Melissa's]] shadow. Darren believes that Hanna felt this way concerning [[AlphaBitch Alison]].

to:

* AlwaysIdenticalTwins: [[spoiler:The person who died was actually Alison's identical twin Courtney who twin, Courtney, whom Alison killed in a fit of rage for stealing her identity. Courtney is even buried under her twin's name.]]
* AlwaysSomeoneBetter: AlwaysSomeoneBetter:
**
Spencer feels she is constantly under her older sister [[TheGloriousWarOfSisterlyRivalry Melissa's]] shadow. shadow, though she's mostly gotten over this by the end of the series.
**
Darren believes that Hanna felt this way concerning [[AlphaBitch Alison]].



* AlphaBitch: Alison before she died. After, Hanna sort of replaces her.
* AnyoneCanDie: Anyone who is important to the plot of one or more books will probably die in the next. By the end of ''Wanted'', the dead people include [[spoiler:Ali (''nope''), Toby Cavanaugh, Mona Vanderwaal, Jenna Cavanaugh, Ian, Courtney, Tabitha, and Gayle.]]
* AssholeVictim: Alison wasn't exactly the nicest person around. [[spoiler:Ultimately subverted, as Alison wasn't the "victim" after all.]]
** [[spoiler:Not that the real victim Courtney was much better]]

to:

* AlphaBitch: Alison before she died. After, Hanna and Mona have sort of replaces her.
replaced her by the start of the series, though Hanna eventually loses this.
* AnyoneCanDie: Anyone who is important to the plot of one or more books will probably die in the next. By the end of ''Wanted'', the dead people include [[spoiler:Ali (''nope''), Toby [[spoiler:Toby Cavanaugh, Mona Vanderwaal, Jenna Cavanaugh, Ian, Courtney, Tabitha, and Gayle.]]
* AssholeVictim: Alison wasn't exactly the nicest person around. [[spoiler:Ultimately subverted, as Alison wasn't the "victim" after all.]]
** [[spoiler:Not that the
The real victim Courtney was much better]]victim, Courtney, wasn't psychotic and evil like Ali, but she had still devolved into a major bitch by the time she died.]]



* BreakTheCutie: In the books Jenna is teased constantly by Alison and her friends, abused by her stepbrother and then she is blinded by a prank gone wrong. She never holds the teasing against Aria and the others though, [[spoiler:and the prank was her idea, conceived in an effort to take her stepbrother out of the picture.]]

to:

* BreakTheCutie: In the books Jenna is teased constantly by Alison and her friends, abused by her stepbrother stepbrother, and then she is blinded by a prank gone wrong. She never holds the teasing against Aria and the others others, though, [[spoiler:and the [[spoiler:the prank was her idea, conceived in an effort to take her stepbrother out of the picture.]]]],



* BrotherSisterIncest[=/=]NotBloodSiblings: Toby and Jenna.
** But also qualifies as QuestionableConsent.
* ButNotTooBi: Emily has one straight relationship with Isaac, all the rest of her love interests are girls.
* CainAndAbel: [[spoiler: Ali and Courtney]]

to:

* BrotherSisterIncest[=/=]NotBloodSiblings: Toby and Jenna. \n** But also qualifies as QuestionableConsent.\n Though it's later revealed that it wasn't consensual on Jenna's side, and Toby was molesting her.
* ButNotTooBi: Emily has one straight relationship with Isaac, Isaac; all the rest of her love interests are girls.
* CainAndAbel: [[spoiler: Ali and Courtney]]Courtney.]]



** Much more tragically is [[spoiler:Is Courtney trying to convince her parents that Ali is making her look crazy to get rid of her]]

to:

** Much more tragically is [[spoiler:Is [[spoiler:is Courtney trying to convince her parents that Ali is making her look crazy to get rid of her]]her]].



* ClingyJealousGirl: Hanna is like this in her relationship with Sean causing him to dump her.
* CureYourGays: Emily's parents attempt to do this.

to:

* ClingyJealousGirl: Hanna is like this in her relationship with Sean Sean, causing him to dump her.
* CureYourGays: Emily's parents attempt to do this.this to her, but luckily, they don't succeed.



* OfficialCouple: Quite a few throughout the series, but the endgame pairings are:
** Spencer Hastings and [[spoiler:[[OldFlame Wren Kim]]]] are dating.
** Aria Montgomery and [[spoiler:Noel Kahn]] are dating.
** Hanna Marin and [[spoiler:Mike Montgomery are married]].
** Emily a[[spoiler:verts this, and is the only one of the main four girls to be single at the end of the series]].
** Outside of the Liars, there's also Melissa Hastings and [[spoiler:Darren Wilden]], who are engaged by the end.



* TraumaInducedAmnesia: Spencer has no memory of what happened the night that Alison disappeared. [[spoiler:It was revealed Spencer had a similar episode to this when she was younger because she had ended up getting sick. Spencer had gotten into a fight with Alison over Ian. This caused Spencer to push Alison down before leaving the area. Spencer then repressed the memory because of the trauma. Spencer started to remember causing her to believe she may have killed Alison. It turned out that A was just messing with her before Spencer remembered the truth]].
* TroubledButCute: Toby
* [[spoiler:TwinSwitch: Alison's twin sister Courtney had posed as Ali before being sent to the mental hospital, which made Courtney take over Ali's life and Ali to adopt Courtney's.]]
* TheUnfavorite: Spencer in her family and Hanna with her father and stepsister Kate.
* WantingIsBetterThanHaving: Hanna had a crush on Sean Ackard in seventh grade, fast forward four years and they are dating, Hanna wants to have sex with him and he just joined a Virginity Club and refuses to break his vow to have sex before marriage. After they break up this is how she sees it.
* WoobieDestroyerOfWorlds: [[spoiler:Courtney]] even more so. [[spoiler:Alison would force her to trade places with her so she could be the more popular one. Alison grew even more jealous and told her parents that Courtney threatened to harm her. When Courtney tried to say that Alison was the one who said so (which she did) it only made her come off as the crazy one. Courtney was wrongly diagnosed as a paranoid schizophrenic, and spent three years of her life in a mental hospital at the age of ''nine''. Her parents sort of forgot about her and treated her like she was unwanted when she came home to visit, staying in a dinky guestroom and not being allowed outside. Her family even changed their last name from [=Day-DiLaurentis=] to [=DiLaurentis=], because of the shame of having a child in a mental institution. Is it any wonder Courtney wanted to be free and have her old life back? Years later, after switching places with Alison, it turns out to be all for naught. They get into a fight one night. Courtney reveals that she just wants to have a sister again, that she misses the time where they loved each other. Alison reveals that she wants to kill Courtney but she can't. Then Alison's accomplice comes giving her motivation, Alison shoves her into a hole built for the gazebo, Courtney bangs her head on something hard, and she is buried alive.]]
* WickedStepmother: This is subverted with Isabel because Hanna dislikes her mainly out of her jealously for her father finding a new family and preferring them to her.

to:

* TraumaInducedAmnesia: Spencer has no memory of what happened the night that Alison disappeared. [[spoiler:It was revealed Spencer had a similar episode to this when she was younger because she had ended up getting sick. due to an illness. What actually happened was that Spencer had gotten got into a fight with Alison over Ian. This caused Spencer to push Alison down Ali to the ground before leaving the area. After Ali disappeared later that same night, Spencer then repressed the memory because of the trauma. Spencer started to remember causing her When she later remembers this by the time of the series, she starts to believe she may have killed Alison. It turned out Alison in this incident, and only later does she remember the truth and realize that A was just messing with her before Spencer remembered the truth]].
her]].
* TroubledButCute: Toby
Toby Cavanaugh. He ends up committing suicide at the end of the second book.
* [[spoiler:TwinSwitch: Alison's [[spoiler:TwinSwitch:Alison's twin sister Courtney had posed as Ali before being sent to stole her identity when the latter was home from the mental hospital, which made Courtney take over Ali's life and hospital one weekend, causing Ali to adopt Courtney's.be taken back to the hospital in Courtney's place and under her name.]]
* TheUnfavorite: TheUnfavorite:
**
Spencer feels like this in her family and family, though it's later revealed to not be true.
**
Hanna feels like this with her father and stepsister in comparison to her stepsister, Kate.
* WantingIsBetterThanHaving: Hanna had a crush on Sean Ackard in seventh grade, fast grade. Fast forward four years later and they are dating, dating; Hanna wants to have sex with him and him, but he just joined a Virginity Club and refuses to break his the vow he made to have sex wait until marriage before marriage. having sex. After they break up this inevitably leads to their breakup, this is how she sees it.
* WasItAllALie:
** This is how Hanna feels about her friendship with [[spoiler:Mona Vanderwaal]] upon discovering that [[spoiler:Mona was A]]. While she's not around to confirm it anymore, all signs and [[spoiler:Mona's]] words to Spencer indicate that, yes, it was a lie. [[spoiler:Mona witnessed the Jenna Thing, and because she was friends with Jenna, vowed to get revenge on the girls, even though Jenna herself did not want this because it was a prank that she planned herself with "Ali" that went wrong. Mona stopped being friends with Jenna when the latter wouldn't tell the truth about the incident, but was still determined to seek vengeance.]]
** By the end of ''Wanted'', the Liars have a mild version of this about their friendship with Ali. [[spoiler:In her JustBetweenYouAndMe note to them, the real Alison claims that Courtney, who was the "Ali" the girls knew, only chose such "uncool" people like them to be her new friends in order to spite Alison, since they were girls that the real Ali would never have looked twice at. ''Ali's Pretty Little Lies'' reveals that, though Ali did genuinely believe this, it wasn't true, and Courtney really did love her friends; tragically, though, she'd increasingly driven them away from her by that point, and never got the chance to make up with them before Ali killed her]].
*
WoobieDestroyerOfWorlds: [[spoiler:Courtney]] even more so. [[spoiler:Alison would force [[spoiler:Courtney [=DiLaurentis=]]]. [[spoiler:At first, she and her to trade places with her so she twin sister, Alison, were the best of friends and as close as could be be; however, gradually, Ali's more intense personality caused the more chill, comforting Courtney to become the more popular one. Alison grew even more sister. Ali got jealous of this, and told her parents that would threaten Courtney threatened into pretending to harm her. When be her, but always denied it when Courtney tried to say that Alison was told their parents about it, causing the one who said so (which she did) it only made her latter to come off as the crazy one. crazy. Courtney was wrongly diagnosed as a paranoid schizophrenic, and spent three years of her life in a mental hospital starting at the age of ''nine''. Her parents sort of forgot about her and treated her like she was unwanted when she came home to visit, staying in a dinky guestroom and not being allowed outside. Her family even changed their last name from [=Day-DiLaurentis=] to [=DiLaurentis=], because of the shame of having a child in a mental institution. Is it any wonder Courtney wanted to be free and have her old life back? Years later, after switching She eventually does manage to switch places with Alison, it turns out Alison and form her own group of close friends, but gradually, her paranoia and stress over her sister potentially being released from the hospital and coming back to be all for naught. They get into a fight one night. torment her causes her to treat her friends like shit and alienate them, and finally, Ali does indeed come home and kills Courtney reveals that she just wants to have a sister again, that she misses the time where they loved each other. for stealing her life, even though Alison reveals that she wants to kill started the whole ordeal and Courtney but only wanted the happy life she can't. Then Alison's accomplice comes giving her motivation, Alison shoves her into a hole built for deserved in the gazebo, Courtney bangs her head on something hard, and she is buried alive.first place.]]
* WickedStepmother: This is subverted with Isabel because Hanna dislikes her mainly out of her jealously for her father finding a new family and preferring them to her.her.
* YourCheatingHeart: Quite often during the series. By the end of it, Hanna is the only one of the four main girls who has neither cheated on a partner nor been a "homewrecker".
** Aria's father, Byron, cheated on her mother, Ella, with Meredith, one of his college students, and basically forces Aria to keep it a secret when she discovers this. When Ella finds out, she divorces Byron, and he eventually marries Meredith and has a kid with her.
** Likewise, Hanna's dad cheated on her mom, Ashley, with Isabel, and later divorced Ashley to marry Isabel.
** Ian and Wren both cheat(ed) on [[TheGloriousWarOfSisterlyRivalry Melissa]] with [[SiblingTriangle Spencer]].
** Aria cheats on Sean with Ezra, resulting in Sean breaking up with her and calling the cops on them.
** Emily cheats on Ben with Maya when she realizes she's not straight, then cheats on Maya with Trista when she starts believing that the former might be A.
** When Aria and Noel are broken up, she gets back together with Ezra, only to find him cheating on her with Klaudia.
** Ella's new boyfriend tries to cheat on her ''with Aria'', who does not take this well.
** Partway through the series, it's revealed that, for a long time, [[spoiler:Spencer's]] father [[spoiler:Peter Hastings]] and [[spoiler:Alison's and Courtney's]] mother [[spoiler:Jessica [=DiLaurentis=]]] have been having an affair behind their respective spouses' backs. [[spoiler:It's been going on since before the girls were even born, as Peter is Alison's and Courtney's biological father as a result of the affair, meaning that they are Spencer's half-sisters (explaining the resemblance between them).]] When [[spoiler:Veronica Hastings]] learns of this herself not too long after, she divorces [[spoiler:Peter]].
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Added DiffLines:

** Lampshaded by Hanna to the police in ''Toxic'' after several instances of them refusing to believe the girls about [[spoiler:Ali still being alive and after them, including her attempt to strangle and drown Emily]]: "Do you completely disregard all of your victims' testimonies, or just ours?"
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Added DiffLines:

** When Hanna visits Madison, [[spoiler:the girl she framed for the car crash A got them both into, to apologize]], she mentions that she'd mistakenly thought Hanna was "the blonde Pretty Little Liar," an allusion to her being blonde in her more widely-known TV incarnation. In the books, Hanna's a brunette while Spencer is the blonde of the group.
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* FormerTeenRebel: Darren Wilden was a troublemaker in High School but now he's a police officer.
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* CassandraTruth: The girls telling Darren that a second A was tormenting them after [[spoiler:Mona's death]], and, more disturbingly, [[spoiler:Ali desperately trying to convince her parents that Courtney switched their identities. Her failure meant she was locked up in a mental asylum, where, presumably, everyone continued to insist that she was her sister. It's really no wonder she lost her mind as well.]]

to:

* CassandraTruth: The girls telling Darren that a second A was tormenting them after [[spoiler:Mona's death]], and, more disturbingly, [[spoiler:Ali desperately trying to convince her parents that Courtney switched their identities. Her failure meant she was locked up in a mental asylum, where, presumably, everyone continued to insist that she was her sister. [[GoAmongMadPeople It's really no wonder she lost her mind as well.]]]]]]
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* PetTheDog: Alison ([[spoiler:really, Courtney posing as Ali]]) empathized with Jenna’s “sibling issues” and conspired to help her get Toby sent away, so that she could be free from his sexual abuse.
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* LovableSexManiac: Aria's younger brother Mike is a textbook HormoneAdledTeenager and constantly thinks of sex, but is rather funny than creepy.

to:

* LovableSexManiac: Aria's younger brother Mike is a textbook HormoneAdledTeenager HormoneAddledTeenager and constantly thinks of sex, but is rather funny than creepy.
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Added DiffLines:

* LovableSexManiac: Aria's younger brother Mike is a textbook HormoneAdledTeenager and constantly thinks of sex, but is rather funny than creepy.

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Direct linking.


* HotForStudent[=/=]HotForTeacher: Aria and Ezra, though they don't find out they're student-and-teacher until the day after they meet at a bar.
** Aria's father and his student Meredith were this.



* OhCrap: Ezra's reaction to finding out that Aria is a student in his English class. Understandable given how their [[StudentTeacherRomance situation]] could affect his career.

to:

* OhCrap: Ezra's reaction to finding out that Aria is a student in his English class. Understandable given how their [[StudentTeacherRomance [[TeacherStudentRomance situation]] could affect his career.

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No longer a trope.


* WickedStepmother: This is subverted with Isabel because Hanna dislikes her mainly out of her jealously for her father finding a new family and preferring them to her.
* YourCheatingHeart: Aria's father, as well as all the girls except Hanna at some point.
** [[spoiler:To be more specific -- Wren and Ian both cheat on Melissa with Spencer. Emily cheats on Ben with Maya, then later cheats on Maya with Trista. Aria cheats on Sean with Ezra.]]
** [[spoiler:Spencer's father. He had an affair with Alison's mother and is actually Alison's father.]]
** [[spoiler:Ella's boyfriend, Xavier, tries to cheat on her with Aria, who does not take it well.]]

to:

* WickedStepmother: This is subverted with Isabel because Hanna dislikes her mainly out of her jealously for her father finding a new family and preferring them to her. \n* YourCheatingHeart: Aria's father, as well as all the girls except Hanna at some point.\n** [[spoiler:To be more specific -- Wren and Ian both cheat on Melissa with Spencer. Emily cheats on Ben with Maya, then later cheats on Maya with Trista. Aria cheats on Sean with Ezra.]]\n** [[spoiler:Spencer's father. He had an affair with Alison's mother and is actually Alison's father.]]\n** [[spoiler:Ella's boyfriend, Xavier, tries to cheat on her with Aria, who does not take it well.]]
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ZCE and/or misuse


* BlackBestFriend: Maya, who is also a little bit more than that ...
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The page is being cut per TRS.


* BiTheWay: Emily, Alison, Courtney, Trista, and Kelsey.
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* JerkassFacade: In the books, after Hanna becomes popular she often acts like this to hide the insecurities that she still has.
** [[spoiler:It turns out Courtney was actually a nice girl so when she took over her sister's life she was forced to act like this so no one would get suspicious of her, she only truly became a bitch towards her death because of some major stress in her life]]

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