Animal Motifs: Various allusions to rabbits abound and the Big Bad is known as Mr. Rabbit. Arby (real name Pietre - "Peter" and Jessica Hyde are revealed to be siblings. Peter and Jessica...Rabbit. And humans do breed like rabbits...
Anti-Hero: Virtually all of the main cast (save for the villains):
Ian, Becky and Wilson over the course of the series, use methods of kidnapping, breaking & entering, forceful interrogations edging towards Jack Bauer levels, eventually become Pragmatic Heroes. Becky realises it, and is horrified by what they're becoming. Wilson, however eventually does a Face-Heel Turn.
Jessica Hyde is an Unscrupulous Hero, even edging towards Nominal Hero, taking Grant away from the group and having him drink liquor to reveal the location of the manuscript. Her desire to stop the Network is less over for concern for the world and more of a big case of It's Personal.
Dudgale fits the Classical Anti-Hero mold, constantly being screwed over by The Network over what he knows.
Clear My Name: Grant is falsely accused of carrying out a school shooting. Ian and Becky are also accused of child molestation when the Network tracks their forum names to their real identities. Subverted in Anya's case.
Colour Wash: The cinematography is highly over-saturated, in-keeping with the comic book medium.
Conran Letts and his assistant, who run Corvadt entirely as a front for Network operations.
The American executive who is paid by the Network to modify corn in specific ways. He doesn't seem to know much about the conspiracy, simply accepting the money and doing as he's told.
Cosy Catastrophe: The Network state that they're trying to bring about The End of the World as We Know It as quietly and humanely as possible in order to avert a bigger collapse, although numerous people state that it will still cause a global meltdown.
Crouching Moron, Hidden Badass: For all of his complete lack of empathy, social skills, diction and personal hygeine, Arby proves to be scarily competent and tracking and anticipating people.
Cutting the Knot: Jessica's low-tech way of bypassing the keypad in the last episode.
Decoy Leader: Letts' unnamed assistant is a decoy for the real Mr. Rabbit, even going so far as to give himself the same disfiguring scars. And that's after we're led to believe that Letts is the one in charge.
Dirty Coward: Donaldson's involvement in uncovering the plot and retrieving the manuscript is shown to be solely so he can broker a deal with The Network in exchange for enough money for him to live the rest of his life comfortably. He goes home empty-handed but denies Becky access to medication.
Downer Ending: Milner reveals herself to be Mr. Rabbit all along, and succeeds in capturing Jessica Hyde, who had been carrying Janus inside her blood all along - with everyone else unaware of this. Becky's Deel Syndrome triggers and she flees from Ian and Grant. Wilson Wilson has done a Face-Heel Turn and been left to die.
Dragon-in-Chief: Letts' assistant, who actually has a much more important role in the Network than his apparent boss, even though he's not actually Mr. Rabbit, just a decoy.
Even Evil Has Standards: The school shooting in episode 3 has this effect on several Network members. It is this event that causes Arby to start questioning his loyalty, leading to his Heel-Face Turn, while Letts is visibly reluctant to give the order and has to be talked into it by his assistant.
Every Man Has His Price: Dugdale manages to turn the tables on his blackmailers by obtaining evidence that the Russian flu outbreak is actually a mass poisoning carried out by the Network. Using this new leverage, he negotiates a deal whereby he will stay quiet in exchange for a substantial annual stipend, which helps to convince them that he doesn't pose a threat to their plan.
Fat Slob: Arby, his paunch accentuated by a much-too-small leather jacket. When he's not scoffing chocolate raisins, he's wolfing down fry-ups, and the constant wheezing of his troubled breathing is quite unsettling. He hasHidden Depths.
Fingore: Dugdale retrieves some fingers severed from corpses in Fetlar for testing.
Frame-Up: Grant is eventually framed by the Network for a massacre at a primary school by digitally altering the CCTV footage of Arby committing the act. As Jessica points out, it is not designed to hold up in a court, but it makes Grant a fugitive, and that much easier to apprehend him.
Gaia's Lament: Letts mentions that a third of arable land is now unusable due to overfarming.
Good Is Not Nice: Jessica exemplifies this by insisting that the other characters cut off all contact with their loved ones and constantly berating them for their stupidity, and she succeeds in keeping them alive. However her tendency of killing people who she believes are a liability is a step too far for Ian.
Government Conspiracy: The Network has at least one UK cabinet minister and a shitload of people in the police and secret service on their side.
Guinea Pig Family: Long-lost siblings Jessica and Arby/Pietre were both experimented on by their father.
Also implied with Milner, whose son has Deels syndrome. If the person we see in her house is actually her son anyway...
Handicapped Badass: Wilson becomes this after losing an eye to Lee, and even manages to shoot him whilst completely blind.
Hannibal Has a Point: The Network's plan is obviously extreme and completely unethical — evil on an unprecedented scale. But whenever they are asked point-blank if there is any other way to prevent catastrophic overpopulation, the good characters can only come up with unconvincing "we're doing our best!"-type arguments, if that. Horrible though it may be, the reasoning behind it convinces Wilson to do a Face-Heel Turn, despite the fact that the Network murdered his innocent father.
Happily Adopted: Dugdale eventually adopts Alice after the death of her mother.
Humans Are Bastards: The Network are big believers in this. They don't think there's any reasonable way the human race will stop breeding past the planet's ability to support them, and fear poverty and war once resources start to run out. Our heroes don't exactly do a bang-up job of proving them wrong.
I Coulda Been a Contender: Donaldson, who described himself as a rising star at Corvadt, was Reassigned to Antarctica after he revealed that SARS was not a real epidemic. His desire for a more flamboyant lifestyle is what pushes him to sell out.
I Did What I Had to Do: Jessica kills anyone who could possibly be used by the Network to find her. Ian calls her out on this, and she coldly informs him that if they leave witnesses behind they'll be dead within the week.
Dugdale informs the Network when Ian, Alice and Grant turn up at his door looking for help, which leads to Grant's capture. His other choice would have led to his death, his wife being raped and his pregnant lover kept in jail indefinitely. He feels guilty about his decision, even moreso when he finds out the truth about Anja.
I Have Your Wife: The Network regularly gets what it wants out of people by threatening their loved ones, including Dugdale's wife and both Grant and Alice's mothers. The latter is killed by Arby.
Ill Girl: Becky, who's suffering from the same disease (Deals' Syndrome, which combines epilepsy and locked-in syndrome) that killed her father.
Improvised Weapon: Grant fashions a shiv from one of the maintenance panels on a laptop and uses it to kill Mr. Rabbit.
I Warned You: When they live in someone else's house, Jessica warns Becky, Ian and Winston not to take a shower or a bath because they have to be ready to leave at any time. Becky finally takes a bath and, of course, the family owning the house returns at that precise time.
Karma Houdini: Donaldson. He is neither a good guy nor really a villain, just an egoistical bastard that wants revenge and money. He even condemns Becky to a slow and painful death out of petty malice by throwing the drugs that could save her life (or at least delay the unavoidable) into a lake. And he, out of all people, gets out of the story alive and mostly unharmed.
Lack of Empathy: Arby and Jessica, both of whom were experimented on as children by their father, turning them into remorseless killers.
Law of Inverse Fertility: While Dugdale and his wife struggle to conceive using IVF treatments, he accidentally impregnates a prostitute on the side. Subverted when she turns out to be a Network agent sent undercover to create the necessary conditions for blackmailing him (and whose pregnancy is most likely fake).
Dismantled Macguffin: The manuscript for the second Utopia comic is actually (amongst other things) a jigsaw detailing the chemical composition of Janus. Naturally, the heroes keep a few pages to themselves.
Living MacGuffin: It is eventually revealed that Carvill hid Janus inside his daughter, Jessica Hyde, and that finding the manuscript was only the secondary goal of the Network.
Meaningful Name: Jessica Hyde's bears a distinct resemblance to Jekyll & Hyde, foreshadowing her dual role of good and evil and of being the carrier of Janus, the genetic trigger named after the two-faced god.
Anya, Dugdale's prostitute lover who is supposedly carrying his child, is revealed to have been a Network agent all along. Her kidnapping was faked in order to manipulate Dugdale into helping the Network. It's also heavily implied that she wasn't even pregnant at all.
Becky is a mole for Donaldson, a scientist who wants to sell the manuscript to the Network. In return, he supplies her with the medication to minimize the fits brought about by the disease she's suffering from. In the end, Becky refuses to give him the manuscript and he throws the drugs into a lake.
Obfuscating Stupidity: There are indications that Arby is more intelligent than he lets on. When he tells Jessica that he's a regular at the roadside diner they're in, she dismisses it as pathetic, transparent nonsense. However, he later pulls a gun on her out of nowhere — a gun he retrieved from a bathroom stall at the diner.
Ragtag Bunch of Misfits: The group is initially composed of people who just happened to be in the online chatroom when Bejan made his announcement; a media/comics student, an office IT worker, a Conspiracy Theorist and a delinquent child.
Reality Retcon: Donaldson discovered that the 2002-2003 SARS outbreak wasn't actually a viral epidemic, but rather a bunch of unconnected respiratory infections. The Network responded by disgracing and discrediting him so that no one would take him seriously.
Real Name as an Alias: Despite going to great lengths to ensure he can't be tracked online, Wilson still goes by the username "Wilson Wilson," precisely because it's such an implausible name to begin with.
Scenery Porn: The over-saturated colors (indeed, like those of a graphic novel) and the carefully selected and framed shots make the visuals one of the best aspects of this series.
Sociopathic Hero: Jessica Hyde, who having narrowed down the identity of Mr Rabbit to one of fourteen people suggests killing all of them just to be on the safe side. The others are all pretty much horrified by this. Granted, a lifetime of abuse and running from people trying to kill you is not the recipe for an empathic, well-balanced individual and her ruthlessness is the main reason she's managed to survive for so long.
Soundtrack Dissonance: Much of the series' soundtrack is bouncy, almost comedic, horns but underlain with a dark almost dirge-like backbeat.
Sterility Plague: The Network plans to use Janus to sterilize 95% of the world's population, to prevent overpopulation and starvation across the world.
Those Two Bad Guys: Arby and Lee, the hitmen. Subverted in that Lee is killed in the first episode, and only appears again briefly in a flashback during episode 2. His death is one of the first triggers for Arby's Heel Realization.
Tragic Villain: Arby the assassin, brainwashed and having had all the empathy beaten out of him by the Network, gradually comes to realise the error of his ways. The fact that he is unable to feel guilty over killing so many people upsets and confuses him, and he unwittingly reveals to Jessica during the cafe scene that he just wants to be normal.
Trapped In Villainy: Dugdale is initially blackmailed into buying the vaccine through his relationship with a prostitute whom he's gotten pregnant. Once he rebels and finds out that the flu epidemic is fake, he is shown that his wife is being tailed and will be raped on command if he doesn't comply.
When Dugdale is talking to Donaldson about how they are both being blackmailed by The Network, it leads to this amusing exchange:
Donaldson: All I know was within the next few weeks I was embroiled in a sex scandal. Professor Pervert addicted to coke and prostitutes.
Utopia Justifies the Means: Pretty much the Network's justification for sterilizing nearly the entire population of Britain, believing it to be a merciful alternative to everyone starving to death when food shortages become too great.
Letts: You accuse us of being genocidal? Not acting is genocide! Where do you think your food comes from Ian? A third of the world's farmland is now useless due to soil degradation. Yet we keep producing more mouths to feed. And what's your answer to that? Energy-saving lightbulbs?
Villain Ball: Lee has one with smoking. The first time he tries to light up, he's standing next to an open gas main and nearly blows himself and Arby up. The second time, he gives away his position in a parked car to Grant when Arby opens the window to let the smoke out. The third time, he leaves Wilson tied to a chair to go out for a smoke; when he comes back Wilson has freed himself and shoots Lee with his own gun.
Would Hurt a Child: The Network have no qualms against killing many children to advance their aims, though some members, most notably Arby and Letts, express reservations. The former is so sickened after having carried out the massacre in the school that he goes on the run and later asphyxiates himself, and the latter was visibly upset by having to give the order.
Wrong Side All Along: Wilson, having come to the conclusion that the Network's plan will ensure humanity's survival, betrays his friends and so is subsequently killed by Jessica.
Wilson: I mean, what he's saying... isn't that... right?