Prince Charming, compared to Snow White. He is the one who invents their I Will Find You motto and thinks that Emma will come back.
Daniel, compared to Regina. He believed that they should just talk to her mother, and that they would overcome their hardships and marry easily in the end.
Identity Amnesia: Everyone with the exception of Emma, Henry, Regina, Gold, Jefferson, Neal/Baelfire, and August. Graham was cured from this after kissing Emma...just before he died.
At the end of Season 1 the curse is broken and the Identity Amnesia is removed, only to be replaced by a new version: anyone who attempts to leave Storybrooke, or is forced across the town line loses all memory of who they were before the curse. Most notably, this occurs to Belle in Season 2, leaving her with no memories at all since unlike most Storybrooke residents she didn't have a Storybrooke counterpart during the curse.
The trope is somewhat turned on its ear by several Storybrooke residents, most notably Red/Ruby, stating they wish they still had identity amnesia as they didn't care to regain memories of things they did before the curse.
Emma and Henry have this for awhile in Season 3, after Pan's curse prompts Regina to give them happy fake memories where they've always been together but have no recollection of Storybrooke or it's inhabitants.
Idiosyncratic Wipes: Some scenes in Storybrooke or the Enchanted Forest focus on one specific element, closes in the focus, and when the shot pulls back, the location has changed from one to the other. One notable example is The Reveal of August's true identity.
Idiot Ball: Meted much more often in the second season.
Granny in "Red-Handed." Instead of simply telling Ruby that she is the wolf and her cloak can prevent the transformation, she relies on the mistaken assumption that Ruby will heed her warnings, stay inside, and always wear her cloak.
It's practically a Required Secondary Power for Mr. Gold/Rumpelstiltskin. That is, aside from all the actual magic, his power over people lies in the "Deals" he makes with them. But what really makes that power work is his ability to smack them with the Idiot Ball at the key moment of the negotiation.
The otherwise cunning Mr. Gold/Rumplestiltskin is given an idiot ball any time there's trouble concerning Belle.
When Regina of all people tells him about Belle's death, he seems to immediately forget all magical or non-magical means of checking this himself. Regina keeps Belle locked up for 28 years.
When Belle stumbled over the town line and lost her memory (thereby making Gold a stranger to her) his reactions include turning extremely violent in plain sight of her, kissing her when she's unconscious in hospital, trying to pressure her into remembering while babbling on about charms, magic and castles and generally reverting to his cold-hearted jerk persona - hell of a way to endear himself to her.
Or anything concerning his son. In Ep. 2.12, Cora literally gives him a ball as enticement to accept the Deal she's offering.
In the second episode of the second season, "We Are Both":
Emma and Snow neglect to mention anything about Storybrooke, the curse, and/or their identities to the Enchanted Forest's survivors. That would've made the trip home so much easier, and Cora might not have been alerted to their presence.
And then they try to make a bolt for it while tied up and surrounded by alert, armed villagers.
In the third episode of the second season, "Lady of the Lake":
Emma shoots her gun in order to break up an argument. Shortly after learning that ogres hunt via sound.
Emma telling Cora about Henry.
Snow drinks "water" given to her by King George, a man who clearly has it out for her.
In the sixth episode of the second season, "Tallahassee":
Emma double-crosses and abandons Hook out of fear of being betrayed again by a man, despite him not lying about his absence of loyalty to Cora, and her being MUCH more trusting of and intimate with Graham. Hook doesn't take this well, later ripping out Aurora's heart for Cora and providing her with a means to get to Storybrooke.
In "Child of the Moon" while Ruby/Red is concerned enough about changing into a wolf and hurting people that she locks herself up, no one thinks to have people on watch, they just go off on their business with even Granny not on guard duty. Not even a security camera if they were that concerned that the guard wouldn't be safe.
The eighth episode of the second season, "Into the Deep":
Aurora gets captured by Cora, whom we've already seen impersonate Lancelot, and yet when she turns up again they don't suspect any trap. Granted it's not the same kind of trick as before, but...
Snow White's allies after she takes Rumple's potion and the resulting memory loss turns her to the dark side. Subverted in that they fail, and only falling in love again brings her back instead of recalling old memories.
Prince Charming coaxes Ruby in her wolf form out of her fear.
Ignorance Is Bliss: The Dark Curse exiled characters from a fairy tale world into the real world with new memories. Considering nearly all of them have ridiculously tragic back stories, sometimes not knowing is a blessing.
Implicit Prison: Storybrooke, which prevents its residents from leaving, except for Henry in the pilot apparently, and once the curse is broken anyone attempting to leave loses their original memories.
A Season 3 episode reveals that Regina also left the town at one point in order to adopt Henry, and again in order to return him when she had second thoughts about adopting.
After a fashion, how Snow deduces that Lancelot is Cora in disguise. Emma only told one person Henry's name.
Again in "The Evil Queen": This is how Snow figures out that the peasant woman she's been helping is actually a disguised Regina. When Snow is saying how there was never any good in Regina, Regina brings up the time she saved Snow when her horse went out of control. Snow told the peasant that story, but she never mentioned that the Evil Queen was the one who'd saved her.
Belle figures out that Lumiere is lying in "Quiet Minds" when he says that he's been trapped in Rumplestiltskin's library for centuries. Belle knows that Rumple built that library for her and did so barely thirty years ago.
Infant Immortality: Come on. Did you really think they were going to kill off Henry in the first season finale?
Infinity+1 Sword: Excalibur shows up in the third season, when Charming finds it for Snow so that she can drive out Regina. It's one of the few powerful non-Dark artifacts, and Rumplestiltskin even notes that it is immune to his powers (though whether it extends that immunity to the wielder is unclear). The sword Snow was using wasn't Excalibur, though. It was a fake Charming made as a Magic Feather so that she could rule.
Ink-Suit Actor: A rare inversion of the trope, in that Georgina Haig, though not involved with Frozen, is a dead ringer for Elsa's animated form, more so than any other OUAT character to date.
Most of the Frozen characters, actually. Tyler Jacob Moore very much captures Hans's physical form.
Inn Between the Worlds: There is a room reachable through the Mad Hatter's hat connecting the Enchanted Forest with Wonderland, the Land of Oz, Neverland and the Land Without Color along with other various worlds or universes, though only ones with some magic.
In the Blood: Strong magical powers can be passed from parent to child, whether by birth or other circumstance. This is revealed because Neal/Baelfire has stronger than normal magical capabilities with his father becoming the Dark One... about ten years after he was born.
Cora comes off as one initially, thanks to her having very powerful magic, when most of the heroes are relatively mundane (her first major defeat comes when the main characters accidentally find out that love is a very powerful magic).
Rumpelstiltskin is a literal one as long as you don't have his dagger.
Tamara, however, is definitely this in her first few appearances. While she isn't directly opposing the heroes at the time, her plans succeed in the most contrived ways. Despite being new to Storybrooke, she ends up always being in the right place at the right time, including intentionally going to a hidden place that most of the town didn't even know about at the time. This comes to a head when she attempts to kill August. He survives just long enough to fail to give any useful information. Only, then the characters realize that they might be able to bring him back... and they succeed! Only... without any of his memoryas August. What helps this stand out is the fact that, so far, she doesn't seem to have a fantasy counterpart.
It ends up that Tamara was only such because her secret boss, Peter Pan, allowed it. The trope is then subverted in a very painful way for her once she outlives her usefulness. Pan himself is a true example, as he is tied to the power of Neverland that makes him a Physical God so long as he believes he is... and he's arrogant enough to believe it wholeheartedly. However, it turns out that Rumplestiltskin was right all along; Pan can be defeated — at the cost of his own life as well.
Ironic Echo: Many of the Storybrooke characters echo lines from their fantasy counterparts.
Rumplestilskin (in his Mr. Gold form) refers to his favourite phrase "Magic always has a price" when lamenting that magic has become his crutch, since he has become dependent on using it to compensate for being such a coward.
Giving a baby their best chance.
A further twist of this with the reveal that Cora gave up Zelena in order to give Cora herself her best chance.
"You have no idea what I'm capable of."
"I will always find you", said by Prince Charming to Snow White, in the Pilot and "Snow Falls" (two very different contexts); also Mary Margaret in the pilot: "If you love them and they love you, they will always find you."
Prince Charming to Baby Emma: "Find us"—later, grown up Emma: "Finding people is what I do."
In Episode 4, Mr. Gold calls Emma "charming"—aka her father'snickname. He called David the same thing in Episode 6.
"Didn't see that coming, did you?" both said by Charming to two very different animals.
Everything that happens to Rumplestiltskin in Episode 8, including The Dark One telling him "Magic always comes at a price."
Two phrases in Episode 16, both uttered twice. "I'm just invested in your future." Said by Rumple/Gold to Mary Margaret/Snow both times, and "Evil isn't born, it's made." (By two different villains.)
A visual version of this for a spoken line. You know how Regina messed with the Queen of Hearts earlier? Well, look at where Emma is aiming in Regina's dream. "Off with her head."
One episode named for a real-world city, "Tallahassee". deals with Emma's relationship with Henry's biological father. So does the next episode named for a real-world city, "Manhattan".
Belle/Lacey telling Gold that he "wasn't the man she thought he was." The first instance is in the Enchanted Forest, when Rumple spared Robin Hood's life. The second time was in Storybrooke, when Lacey finds Gold in the middle of beating the former Sheriff of Nottingham half to death with his cane.
"Does that surprise you?" is Hook's reaction both times Emma thanks him for doing something good/heroic.
Ironic Nickname: The giant is called Tiny, though it's only a nickname as he is the smallest of the giants. His real name is Anton.
Irony: Victor Frankenstein, of all people, leading an angry mob in the Season 2 premiere.
Kathryn, eventually, towards David and Mary Margaret. Regina does not agree.
Also, Neal, Henry's father, to Emma, who wanted her to live a crime free life.
David hopes that if he dies, Snow will be able to move on because he had been injured by a poisoned arrow.
In season 4, Regina of all characters is doing all she can to save Robin's wife Marian. She also suggests to him that if she fails, he will have to forget about her and love his wife back to make the true love's kiss work.
Jerkass Genie: Partial subversion in that it's the magic, not the genie, as the Arc Words "Magic comes at a price." The genie is even perfectly willing to warn against it. He's still personally a jerkass, in either world.
Jerk Witha Heartof Gold: Hook, despite pulling many awful stunts, ultimately operates by a code of honor and turns out to be a full hero once his feelings for Emma develop.
With Regina, every now and then she shows a side of her that's more sympathetic, such as when her son falls down the well or when she's saved from the fire. And then she ruins it either the same episode, or an episode later by doing something completely harsh. For example, it seems like she finally warmed up to Emma being there, when she confessed that Mr. Gold set her up, and after saving her from the fire. But it turns out that she just wants her there in order to go after people she doesn't like, telling her to "do her job" (which includes arresting innocent people).
Mr. Gold has some positive qualities and genuinely loves Belle and his son (yet is shown to break promises and/or behave cruelly toward them because of his obsession with power), and in addition to his gambits with positive outcomes, likes to make deals to screw people over and has killed for poorly justified reasons.
Rumplestiltskin's first evil act was to slaughter the soldiers who humiliated him in front of his son and were going to conscript said son into the army.
In "Skin Deep", Mr. Gold behaves as a rather unsympathetic Loan Shark toward Moe French and later on savagely beats him for stealing something of value to him. This is somewhat understandable because in the Enchanted Forest, French is Belle's father and supposedly put her in an insane asylum where she was mistreated until she committed suicide in despair. This turns out to have been Blatant Lies, but Rumplestiltskin has no way of knowing that.
More often than not, most of the drama in the show consists of Regina, Rumplestiltskin, Hook and Cora antagonising each other.
Rumple murders Zelena when she's powerless and begging for mercy. Given that she enslaved Rumple, made him fight against his own allies, caused the death of his son, and tried to destroy everyone's existence by going back in time, most of the audience cheered.
Kudzu Plot: Unsurprisingly since it's from creators that once worked on LOST.
While most threads are tied up, several storylines will likely never have a proper conclusion. How and why did the Queen of Hearts captured King Henry? How Jefferson and Doctor Whale end up in Storybrooke despite living in others worlds than the Enchanted Forest? Why does August know so much about Rumplestilskin and his son? How did Aurora and Mulan bring Phillip back? And for that matter, what happened to Mulan after supposedly joining Robin Hood's Merry Men?
Rumplestiltskin's cowardice costs him his wife, his son, Belle, and more.
The Genie's murder of the man who freed him leads to his re-imprisonment.
Perhaps to be expected in a series that also features Pinocchio, lies tend to rebound back on those who tell them.
David's dishonesty with Kathryn and Mary Margaret almost costs him Mary Margaret for good.
The events of "Tallahassee" and the first scene in "Broken" suggest Emma may have set herself up for some of this later on by telling Henry that his father died a hero. (And the events of "Manhattan" prove this to be correct.)
Cora sets up a spell where one life can be exchanged for another's and sickens Snow White's mom in the hopes of corrupting Snow White into using Dark magic to save her mother. Snow White refuses and her mom dies from Cora's spell. 30+ years later, Cora is rampaging across Storybrooke and about to get absolute power by using the same spell on Rumple. Snow gets her hands on that candle again and targets Cora.
Regina spent her time as Queen on an indiscriminate Roaring Rampage of Revenge against anyone suspected of helping (or sympathizing with) Snow White across the countryside, slaughtering entire villages to make a point. One of the people she executed? Maid Marian. Now, she's built a new life, hooked up with Robin Hood, made some progress on a Heel-Face Turn... Guess who Emma rescued while playing with the Timey-Wimey Ball and brought back to present-day Storybrooke?
After having experienced a life with Henry (albeit a fake memory of one), Emma is adamant that she and Henry would be better off returning to New York rather than staying in Storybrooke with her family. It takes a trip to the past and almost undoing her existence to set her straight.
Rumplestiltskin is the latest in a long line of "Dark Ones", each one immortal until murdered by the next one.
Leitmotif: The Evil Queen, Snow White, Charming (who has an especially awesome one), and the Official Couple Snow/Charming all have their own music themes. Later, August, Belle, and Hook have their own. Hook and Emma also have one as a couple.
This, along with Reconstruction, may explain the show's success. After years of sexed up comedy shows, reality TV, Darker and Edgier dramas with Black and Gray Morality conflicts, and grislier police/medical/lawyer procedural shows, a straight up battle between good and evil with an intriguing mystery at the core feels so refreshing to audiences in comparison.
The second season goes Darker and Edgier, and... well, the above reasoning also explains why it's had a noticeable drop in the ratings compared to the first season.
Season 4, however, introduced the inherently lighter and softer characters from Frozen and the rating shot right back up again.
The story of Hansel and Gretel is softened by making it an accident that the children were separated from their father rather than him abandoning them.
The most serious use of this trope is most probably the resemblance between Peter Pan and his son Rumplestiltskin in terms of how they abandoned their respective sons out of sheer selfishness. There is, however, one key difference: Rumple instantly regretted it, and spent years trying to make up for it, while his father never regretted it, to the point that he even gloats about it.
Limited Wardrobe: Somewhat in the Enchanted Forest, at least for some of the more iconic characters. For instance, Belle shows up in a bar in "Dreamy" wearing the same finery she had when in her father's and the Beast's castles.
The outfit Queen Eva is buried in is the same one she wears planning a ball and then on her deathbed.
Captain Hook has been wearing the same leather pants and coat since he was introduced, basically.
He finally updates his look in "The Apprentice", and he seems to be sticking with the new outfit.
Little Black Dress: Possibly a bit of lampshade-hanging given the wholesome nature of the characters involved, but so far Belle, Ariel and Tinker Bell have all been seen wearing some variant of the LBD while in Storybrooke. In fact so far it's the only item of clothing Ariel and Tink have been seen wearing thus far (with Belle sometimes swapping out for a little blue dress or some such, though she also dresses weather-appropriate when necessary).
Living Emotional Crutch:Daniel, young Regina's lover to Regina. After, he dies, she is ready to be married off and looks like she is dead inside. If Regina didn't discover that Snow was partly responsible for Daniel's death, Regina possibly would have stayed dead inside.
Local Hangout: Granny's diner (which seems also to serve drinks like a pub).
Longest Pregnancy Ever: Ella's 28-year and 9-month pregnancy. Justified in the fact that time having stopped in Storybrooke is a major plot point. Ella was pregnant when the curse hit, so logically, she would have been stuck like that until Emma arrived. And when Emma does arrive, she's finally able to give birth. Though it's not like she would remember being pregnant for that long, at least until the curse is broken.
Long-Lost Relative: Henry and Emma. Emma and her parents, Charming and his twin. Rumple and Peter Pan, his father. Rumple and Baelfire/Neal, his son.
Ingrid the Snow Queen is revealed to be the aunt of Elsa and the former foster mother of Emma.
Daniel is very much this for Regina, his death being the main cause for her hatred against Snow, which is why she cast the curse.
Love at First Sight: Oddly enough, less than you'd think. Several of the main couples (Rumplestiltskin/Belle, Snow White/Prince Charming) did NOT have this in their romance, and for those who did (The genie/Regina), there ended up being negative consequences from it.
You could argue that, at least, Prince Charming did fall in love with Snow White at first sight...
Played Straight/Retconned in "A Curious Thing", Snow confess to Charming: " I've loved you since the first moment I saw you".
In "Ariel", Hook claims he never thought he'd be capable of letting go of his first love, until he met Emma. Although his revenge continued to guide his actions after that and for a while he still flirted with every woman in sight.
Dozens of times between Charming/David and Snow/Mary Margaret. Those two in both worlds run into emotional/moral roadblock after roadblock on the way to getting together. They're pretty battered and bruised at this point.
Emma suffers from this when she discovers Graham has been sleeping with Regina. And later on when Henry's biological father reenters her life in a very unexpected manner.
He ends up with this after he learns what happened to Belle after he made her leave his castle (under the incorrect impression that she was working for the Evil Queen).
And then there's what Milah did to him...and what he did to Milah afterward.
And then there's what Cora did to him after he helps her.
Having to forsake his love for the fairy Nova turned Dreamy the Dwarf into the Grumpy Dwarf we know today.
Regina and Daniel. That ended well.
Hook spends most of Season 3 making heart eyes and heartbroken eyes at Emma, especially when obstacles such as Neal's return and Pan's Curse prevent them from being together.
Sidney/the Magic Mirror became evil because of his love for the Evil Queen.
Regina’s trying to frame Mary Margaret by implicating this.
Regina herself turned evil after the death of her true love, something for which she blames Snow.
Rumplestiltskin, for a slightly broader definition of "love" that includes parental love.
Both played straight and subverted with Captain Hook. The loss of his love Milah turned him evil, while falling in love with Emma makes him a better man.
Love Martyr: Belle to Rumplestiltskin/Mr. Gold. After an initial rejection from him and her in a cell in an asylum for bloody 28 years!, the start of the second season sees them in a relationship of sorts. They both avowedly love each other, but Gold is still fully capable of being a manipulative jerk, and sweet mother of Shakespeare, does Belle pay the price for it, be it through Gold himself or one of his many enemies recognizing Belle as the weak spot in his armor. And yet Belle never wavers.
Love Potion: The only potion Rumplestiltskin has been unable to make. Until he combines a strand of hair from Snow White and Prince Charming.
Love Redeems: Played with in the case of Rumplestiltskin. It's implied love could have saved him, but he rejected it. Because giving up his powers would have required him to give up on ever seeing Baelfire again; see Love Makes You Evil above. Since the girl in question hasn't given up yet, this may or may not turn into a full-blown Love Redeems.
Regina's attempts to redeem herself in Season 2 are motivated by the desire to prove herself to Henry and win him back.
Captain Hook's redemption arc in Season 3 is motivated by his feelings for Emma.
A sort of lopsided one appears in Episode 7 between Emma, Graham and Regina. It ends with Graham's death by Regina's hand.
Then there's Snow White and Prince Charming loving each other despite the latter's Arranged Marriage to Abigail, as well as their Storybrooke counterparts: Mary Margaret, David and his wife Kathryn. The former love triangle is resolved with Charming leaving his wedding for Snow, and the latter love triangle is resolved once Kathryn pulls an I Want My Beloved to Be Happy and everyone gets their memories back.
Prince Phillip and Aurora are each other's true love. Mulan, Phillip's longtime comrade and friend, might be in love with him too. His untimely death at the hands of the wraith leaves this matter unresolved. Things have gotten a little more interesting with the reveal that Mulan is in love with Aurora as well, but has decided not to tell her because Aurora is pregnant with Phillip's baby.
Season 3 creates one between Emma, Neal, and Hook. Hook has feelings for her and Emma and Neal still deeply love each other, but have gone through too much pain to even think about attempting resume their relationship, with Emma even at one point proclaiming that she wished Neal was dead in order not to deal with it. So Emma preemptively shuts down the triangle by saying that the only important one in her life is Henry.
It seems like the love triangle will continue post-saving Henry, but Neal dies, officially resolving the triangle via Deathofthe Hypotenuse.
Low Culture, High Tech: Subtly invoked beginning in the second season after the curse is lifted. While we've become used to the Enchanted Forest residents using modern-day tech in their Storybrooke personas, it occasionally is brought into relief, such as a Season 2 episode in which Belle - who did not have a Storybrooke counterpart, and thus after the curse was broken was the same medieval Belle of the Enchanted Forest - is shown not only using a cell phone, but at one point arms herself with a very modern-looking handgun.