Better to Die than Be Killed: In Dawn of the Dreadfuls Lt. Tindale swears that he will never let himself become a zombie. True to his word, when the battle becomes hopeless, he takes a last look at the window where the Bennet girls are watching and shoots himself in the head.
In Dreadfully Ever After it is mentioned that Lady Catherine has a specific sword that she keeps to commit harakiri with in the case that she ever contract the "strange plague". In the same book, Darcy intends to use that sword on himself after he is infected and realizes that no one can stop him becoming a monster. However, that isn't how it ends.
The Dandy: In Dreadfully Ever After, we have Bunny Mac Farquhar, a quintessential dandy, along with all of his friends.
The Dead Have Eyes - Some do, some don't, but all zombies can hear and find their victims.
Demoted to Extra: Jane only appears briefly in Dreadfully Ever After and Lydia is only mentioned
Dirty Coward: In Dawn of the Dreadfuls Master Hawksworth frequently makes excuses to avoid fighting, and the one time he does join a battle he panics, steals another soldier's horse, and rides for his life, abandoning a hundred soldiers to be eaten by the zombie horde.
We do find out in Dreadfully Ever After, however, that he got his due and spent the next few years trying to atone for his disgrace.
Double Standard: Kitty recalls her father reminding her during a battle to appear dignified because, even though she is a deadly warrior who can claim more kills than an entire company of soldiers, she will always have more to prove.
Follow the Leader - Quite a few other authors have attempted this sort of thing since, including "Mr. Darcy, Vampire."
Fun Personified: Bunny Mac Farquhar. He is described time and again as a fool, constantly indulging in practical jokes, gambling, races, parties, etc. But he's actually one of the most open, happy, guileless characters in the series; all he really wants is to have fun.
"He tried to put on a serious expression, but, lacking practice, failed miserably."
Honor Before Reason - The girls often forgo carrying weapons or combat attire to uphold propriety, which means they frequently run into danger or "enemies" unarmed. Elizabeth at one point ties her dress with a modesty string so she can do hand stands without the skirt falling.
Inverse Ninja Law - Averted. Elizabeth kills three ninjas one on one. Blindfolded. The third and most skilled she kills by catching and returning his own shuriken.
Karma Houdini - In the original Pride and Prejudice, Wickham is something of a karma houdini. He gambles, contracts massive debts, and gets them payed off by almost marrying Georgiana and having Darcy hush it up, and later on actually marrying Lydia after eloping to keep it quiet (though marrying Lydia may be the far worst punishment). In this book, it's subverted. He's crippled for life and left to the care of Lydia, who herself has no concept of the fate in store for her.
Kill It with Fire - The burning grounds. Also done several times with small incendiaries by Elizabeth and Mr. Bennett.
Kill Us Both: In Dawn of the Dreadfuls an infected Dr. Keckilpenny and a zombie.
Lady of War - The Bennet girls, again. Lady Catherine, literally.
Let Us Never Speak of This Again: The Bennet girls come across a zombie mother and infant (which they have never seen before and are deeply disturbed by) and find themselves unable to kill them. Afterward they swear never to talk about it.
Mercy Kill - Elizabeth considers doing this for Charlotte before she starts turning, but decides against it.
My Card: Appears several times. In Dreadfully Ever After Bunny actually uses his pet rabbit as a calling card once.
Plot Hole: Many in Dawn of the Dreadfuls, as it was written by a different author. Errors include the girls' entire training, and more minor things such as the age at which Lydia slew her first zombie.
Shrinking Violet: Georgiana Darcy is like this around strangers. Jane in Dawn of the Dreadfuls, to the extent that "Jane blushed and looked away" becomes something of a narrative catchphrase for her.
Sliding Scale of Gender Inequality: This series falls somewhere between a 3 and 4. It is set in patriarchal regency England, but women are by no means disregarded or not considered important or useful people. And of course, there are female warriors like the Bennets and Lady Catherine who smash the contemporary gender stereotypes to bits. Unmarried female warriors are begrudgingly accepted by society, but for a married woman to carry a sword would be an affront not only to her husband, but to "all English manhood". Most the gender inequality shows up in people mistakenly underestimating or pigeonholing the Bennets.
Spear Counterpart: While not the same character, of course, Bunny is almost identical to Kitty in personality, (only, you know, a guy) which is part of why she is initially so attracted to him.
The Stoic: Nezu, through and through. Invoked frequently with the Bennets, most often by Elizabeth or her father. This was part of their Shaolin training.
Tearjerker: Elizabeth discovers a little boy zombie chained up in a bedroom and thinks it's some kind of sick joke until she realizes that his mother still loves him and keeps him around because he's all she has left. The scene is so pathetic that Elizabeth spares the boy and leaves the place in tears.
Also the "unmentionables", "dreadfuls", or "the sorry stricken". Never the "z" word, watch your language!
The Vicar: Mr. Cummings in Dawn of the Dreadfuls. Typically stiff and uptight, and gets so panicked in one scene with a zombie that he reads the wedding ceremony from his prayer book instead of last rights.
Some scholars believe that the zombies were a last-minute addition to the novel, requested by the publishers in a shameless attempt to boost sales. Others argue that the hordes of the living dead are integral to Jane Austen's plot and social commentary. What do you think? Can you imagine what this novel might be like without the violent zombie mayhem?
Zombie Apocalypse: Averted. Zombies are somewhere between a nuisance and an enemy army in terms of threat. Also, they appear to be confined to England.
The setting is functionally a Cosy Catastrophe played for laughs. Other than always traveling in well armed groups at all times to survive random zombie attacks (especially after winter), the characters all live comfortable lives for Brittish middle/upper classes. It should be mentioned though that in the backstory, zombies have completely overtaken Manchester and in the present repeatedly break down the gate of London Sector Six East. England has survived and made gains against them, but they are still a great enough threat that two can take out an entire kitchen staff.
Zombie Gait: Some show more of this than others, depending on how long they have been (un)dead.