Abusive Parents: Ella's father Sir Peter, of the neglectful variety. Dame Olga also counts.
Arranged Marriage: Ella's father tries to set her up for one with an old duke. It doesn't push through once her father finds out the duke isn't as rich as he thinks.
Baleful Polymorph: One of Lucinda's other 'gifts' involved turning the recipient into a squirrel; she believes she's doing them a favour until she spends a week as a squirrel herself.
Banister Slide: Ella's father and new step mother walk in on her and the prince enjoying themselves sliding down the giant banister in the castle in which the wedding has just taken place. Her new family members are not amused.
Beware the Nice Ones: Charmont. In one of his letters to Ella, he admits to ruining his tutor's career when he was younger just because the man made his sister cry. And years later, he still resents the tutor.
Big Brother Instinct: Charmont is very protective of his little sister, to the point that he sent his former tutor to ruin because he made her cry.
Big Damn Heroes: Charmont and his knights saving Ella from the ogres. Subverted slightly by Ella aiding the attempt.
Bitch in Sheep's Clothing: Dame Olga. When we first meet her, she seems nice enough, at least compared to her daughters (especially Hattie). But once she marries Ella's father and discovers that he had no money, she quickly turns into the cruel, abusive, petty stepmother we know from the Cinderella tale, making Ella a slave in her own home and tormenting the girl after her father leaves for business.
Several, in fact. Lucinda's "blessings" tend to focus on making their recipients better children, where "better" is dictated by the sort of book which declares that the proper behavior for a child is to sit quietly and behave like a miniature adult. She's always baffled when the recipient is unhappy with their Stepford Life.
Boarding School of Horrors: Ella attends one which she eventually escapes. It wouldn't have been so bad if it weren't for Hattie ordering her about and the punishment of meals being taken away if you talked back to a teacher.
Bothering by the Book: One of the ways Ella deals with being forced to obey orders she'd prefer not to follow is to exploit any ambiguity in the wording that allows her to do what she's told without doing what the orderer wants.
Break His Heart to Save Him: Ella tries this with Charmont, knowing that if they do get married she'll only put both him and the kingdom in danger because of her curse.
Brought Down to Normal: Briefly done to Lucinda herself so she realizes the complete horror of what she's done to everyone. Unfortunately, she can't break Ella's curse, or anyone's for that matter, because it's a matter of willpower.
Charm Person: Ogres are able to convince people by the power of their voice that they are friends... right up until they eat them. And Ella somehow manages to copy this power from observation and use it on the ogres.
Con Man: Ella's father tries selling land that doesn't belong to him; getting found out and having to pay off the massive debt leaves him and his daughter nearly penniless.
Cool Pet: Char defies normal fantasy personalities by getting Ella a centaur. Aside from it being a centaur he actually acts like a normal horse, even taking an apple from her hands.
Costume Porn: Lampshaded, when Ella sees Dame Olga's letter to her daughters, which mostly describes her clothing and her social calendar. She only remembers she was writing to them by the last paragraph.
Curse Escape Clause: Not until the very end. The curse is broken once Ella disobeys an order, which she is only able to do, with great difficulty, when the stakes are high enough. Merely saving her own life isn't sufficient, but when it comes to the future of the man she loves and the entire kingdom...
Denied Food as Punishment: After Ella talks back to her teacher Sewing Mistress, the lady punishes Ella by making her skip both dinner that night and breakfast the next morning.
On the journey to the boarding school, Hattie abuses Ella's obedience by forcing her to give all of her food away. Given that the "punishment" is for Hattie being jealous of Ella, it makes Hattie even more of a jerkass
Disappeared Dad: Ella's father is alive, but frequently away on business, and has little to no interest in what goes on around his house in his absence.
Every Proper Lady Should Curtsy: Ella is depicted as being very clumsy at the beginning, stating that "curtsies often make me fall over". Her father wishes for her to become less clumsy and more ladylike and sends her to finishing school. Ella rebels against the stern teachers at the school but eventually gives in to their teachings, until she runs away. The next time her father sees her she's much more graceful and able to do a perfect curtsy.
Exact Words: Ella learns to do this to work around her curse.
Fairy Godmother: Deconstructed with Lucinda, who goes around giving Blessed with Suck "help" to people who don't want it, and Mandy, Ella's actual godmother, who it turns out is also a fairy but is much more inconspicuous (and thoughtful) about the help she gives.
Forged Letter: Ella realizes that if she were to marry Char, her curse would make his life difficult and even dangerous, so she writes a letter in her own handwriting, claiming she's run away with a rich lord, then writes an accompanying letter in her stepsister's handwriting, terrible spelling and all, to back it up. It doesn't work. He just thinks the letter from her is fake, instead.
Geas: The title character is given, at birth, the "gift" of obedience, and she has to do whatever she is told, provided the order is given in a language she understands (end she's an Instant Expert at languages).
Getting Smilies Painted on Your Soul: Ella, at Lucinda's command. Not helped by the elven mushrooms she eats later, making her shamelessly flirtatious towards the old duke her father wants her to marry. When Mandy snaps her out of it later, she's horrified.
The Girl Who Fits This Slipper: Justified in this case because there's fairy blood in Ella's family, so her feet are significantly smaller than most people's.
Gold Digger: A mutual attempt with Ella's father and Dame Olga—except that Dame Olga doesn't know that Sir Peter doesn't have any money until it's too late.
Great Big Book of Everything: Ella's incredibly helpful (and self-disguising) book; being magical, it can even provide detailed information about events as they occur.
Greed: The defining character flaw of Sir Peter, Ella's father.
Olive's most prominent character trait is a desire for more money. She constantly demands that Ella hand over whatever little she has and, when it looks like Ella is marrying Char, she orders her to "give me all of your money!" Char is also shocked that she seriously thinks it would be acceptable for him to order all of his subjects to give him all of his money, just so he'd be richer. Given how Olive is very simple-minded and surrounded by her very greedy, vain sister and mother, it's no wonder she ended up that way.
Green-Eyed Monster: Hattie is jealous of Ella because she's brave, smart, and pretty. It's mainly the reason why she treats Ella so miserably.
Grew a Spine: A concrete-metaphor version, with Ella's compulsion to obey orders that she has to overcome.
Hates Small Talk: Not exactly hate, but all the Ayorthaians that Charmont stayed with for a year were like this. Not through snobbiness, either; it's just they're more contemplative, more appreciative of silence, and far too polite. Much to Charmont's displeasure.
It's also implied that this behavior specifically applies to the Court, where Char was, but doesn't extend to the common Ayorthaians.
Literal Genie: Ella's friends are careful to phrase all of their requests to her in the conditional mood ("could you...?"), which gives her the leeway of refusing. On the other hand, Ella also would follow an improperly phrased order with vexing precision to annoying anyone who tried to take advantage of her curse.
Ineffectual Sympathetic Villain: Olive. She bullies Ella and orders her around, but doesn't seem to have any real malice toward her the way Hattie and Dame Olga do. It is strongly indicated that she has some type of mental or social disability, and she seems to spend a lot of time getting looked down on or dismissed. The fact that she orders Ella to talk to her for hours on end implies that she is probably very lonely.
Irony: Being blessed with "obedience" led to Ella being more stubborn.
Karma Houdini: Arguably, Ella's stepfamily. While Hattie never marries the prince (or at all), neither she nor her the rest of her family are punished for abusing Ella.
Though Dame Olga is still married to Ella's greedy, unscrupulous father, and is magically forced to love him. One also could argue that Ella being able to fight back (among other things, she reclaimed the necklace that Hattie took from her) is a blow to their pride, as is the knowledge that Ella could have them all arrested, should she want to.
Kick the Dog: Done to Ella a lot by Dame Olga, Hattie, and Olive, as well as the extremely snooty governesses at the girl's academy.
Love at First Sight: Charmont mentions in a letter to Ella that he's loved her ever since they first met at her mother's funeral.
Masquerade Ball: The climactic ball is one, allowing Ella an opportunity to attend without being recognized.
Missing Mom: Ella's mom dies of illness early in the book.
Motor Mouth: Charmont's knight who takes Ella to the giant's wedding.
My God, What Have I Done?: Mandy tricks Lucinda into trying out the magical gifts she's bestowed on newlyweds and babies. After three months of being a squirrel, and three months of being an obedient child, Lucinda goes through a horrible breakdown and learns of how many lives she's ruined.
Offscreen Moment of Awesome: Ella is never shown reclaiming her mother's necklace from Hattie. She does recover it, but it's only a quick throwaway line in the epilogue.
Omniglot: Ella is fluent in Kyrrhian, and knows more than enough Ayorthaian, Gnomish, Elvish, and Ogrish to get by.
Our Elves Are Different: Our elves strongly resemble plants and place extreme value on beautifully crafted objects.
Parental Neglect: Sir Peter, Ella's greedy and selfish father. He tries to use his clever ways to gain riches. He gains much of his wealth through trickery and deceit and loses it the same way. Sir Peter takes pride in Ella for being a brave, sassy child. Once he gets to know his daughter, he notes their resemblance, laughs at her attitude, and seems to grow somewhat fond of her. Yet, he deals little with his daughter and is more concerned for his business than her well-being. They have a distant relationship, as Ella acknowledges his corrupt, greedy nature and finds it unpleasant - especially during his attempts to force her to marry. He marries Dame Olga because of her wealth and cares little when Dame Olga forces Ella to work as a servant.
Picky People Eater: When Ella is captured by a family of ogres, they argue over how to divide up her parts. (The neck is the best part, apparently.)
Scullery Maid: As expected for a Cinderella retelling, Ella's stepfamily make her work as a scullery drudge in her own household. The cook is actually a friend of hers, who does what she can to make the situation no worse than it has to be.
Which is lampshaded when Ella uses her magical book to read a diary entry he writes. When he writes about the mysterious maiden he's fallen for at the balls, he accidentally writes her name as Ella's. He then crosses it out and writes "Why did I write that name?"
What Does She See in Him?: Specifically, "what did she see in him?" Ella asks Mandy this about her parents, since they seemed like such complete opposites.