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Actor: Kimberley Nixon
- Alliterative Name
- Bitch in Sheep's Clothing: She's much less sweet than she initially seems, and often gets violent or destructive when she loses her temper.
- Hard-Drinking Party Girl: "I'm a single lady! Can't you handle it?"
- Hypocrite: She's upset at Kingsley for his deception in regards to actually losing his virginity to Ruth instead of her, but Howard points out that she never broke up with Dave, a fact she never admitted to Kingsley.
- Red Oni, Blue Oni: She's the Red to Heather's Blue.
- Took a Level in Jerkass: After her reveal as a Bitch in Sheep's Clothing, she only gets worse. Season 2 does see her getting taken down a peg, though, and she returns to normal.
- Villainous B.S.O.D.: In series 2, when the housemates learn that she has been thrown off her course: "All I wanted was to give myself to dental hygeine..."
Actor: Joe Thomas
- Butt Monkey
- Characterization Marches On: Though he is initially set up as The Woobie, he has a radical change of identity at the beginning of the second series, gaining a completely new fashion sense and an interest in music that has never been mentioned previously.
- Small Name, Big Ego: When Heather asks Kingsley what genre his music fits into, he replies "That's for the NME to decide".
- Took a Level in Jerkass: Starts off as pretty normal and more sensitive than the other housemates, but descends into playing multiple girls at once after his change in identity.
- Unexpected Virgin: Lies about having had sex so he can fit in, but he doesn't lose his virginity until the first season.
- Will They or Won't They?: With Josie, until They Do in the second season finale.
Jonathan "JP" Pembersley
Actor: Jack Whitehall
- Ambiguously Bi: Has demonstrated attraction to other men, especially Kingsley and Javier (the latter, who even comments on how much JP compliments his body).
- Broken Pedestal: Averted; though he worships his late father (especially since he didn't get a chance to say goodbye to him before his death), Vod finds a series of letters from his father to his illicit lover, and burns them before JP can read them.
- Chivalrous Pervert: So crude and horny that he often doodles extremely detailed cocks on any kind of flat surface, but doesn't take advantage of women, and only ever sleeps with those he has some kind of bond with.
- First Girl Wins: He hooks up with Josie multiple times in the first season. After a long period of being Just Friends, they end the series as a couple.
- Hidden Depths: Can be insecure and eager to please and fit in, though the fact that he's not a true Jerk Ass like his posh "friends" attracts some girls to him.
- Horrible Judge of Character: Continually hangs out with his old friends from Stowe, who obviously don't like him and just use him for money. He's incredibly naive about it.
- Ladykiller in Love: For all of his gusto, he does genuinely fall for a few girls over the course of the series. Especially Josie, who ends up being half of the Official Couple with him.
- Rich Idiot with No Day Job: His posh family means he can routinely hire barges or buy expensive items for the house. Come series 4, his reckless spending habits force his older brother to "turn off the money pipe" as incentive for him to find a post-university job.
- Rich in Dollars, Poor in Sense: Does a lot of stupid things, usually to impress his Jerk Ass "friends."
- Screw the Rules, I Have Money!: JP tries variants of this pretty often, from paying Vod for the biggest room in the house, to bribing his way into a BP careers event. Sam even lampshades this in series 3: "You can't just throw money at me like a one-man Bullingdon Club".
- The Nicknamer: Some of his nicknames are affectionate ("The Funky Vodster" for Vod), others not so much ("The Pig Man of Arbroath" for Howard)
- Upper-Class Twit
- "Well Done, Son!" Guy: To his distant dad "I know you loved me, even though you never said it... or showed it... or even implied it..."
Violet "Vod" Nordstrom
Actor: Zawe Ashton
- Bi the Way
- Boyish Short Hair
- Easily Forgiven: Gets away with a lot.
- Hidden Depths: Often accused of being flippant towards her education and not caring about anyone else. In reality, as she reveals to Josie and Oregon in series 4, she worked incredibly hard to get into university (doing night courses on top of several menial jobs) and cares about doing well.
- While not the most academic person, she is good enough to get a 2:1 as her final grade; a degree mark from a British university is determined by how well the student does over their final two years. Not that surprising since English Literature is all about backing up opinions, which Vod is very, very good at.
- Jerk with a Heart of Gold: Seems rough around the edges, but has a gruff, but sincere way of showing kindness to friends.
- Nice Hat: Vod has several.
- The Lad-ette: Crass, vulgar, masculine, and sex-obsessed. Her intentional Girliness Upgrade to impress a man she likes makes her housemates appropriately shocked.
- Scholarship Student: Her "RAF scam"; her father is a member, and she's funding her studies through an officer bursary.
- Starving Student: When her RAF money runs out, she takes to borrowing money from the housemates until they all demand it back at once, forcing her to get a job as a cleaner.
Actor: Greg McHugh
- Badass Bookworm: Series 3, episode 4: two bookworms fight over a book, Howard is victorious.
- Deadpan Snarker
- Loners Are Freaks
- Lovable Nerd
- Geek Physiques: Pudgier variant.
- Nerd Glasses: He tries contacts but they don't work out for him.
- The Stoic: Or so he claims. To Stowe Boy JP, the term means something very different.
- TV Genius: His list of pub quiz specialist subjects is rather impressive.
Melissa "Oregon" Shawcross
Actor: Charlotte Richie
- Bad Liar: "Oh my god! I forgot I had a car!"
- Consummate Liar
- May–December Romance: With Tony Shales.
- Purely Aesthetic Glasses
- Secretly Wealthy
- Spoiled Sweet
- 0% Approval Rating: As president of the Student Union. Cutting the funding for the wheelchair rugby team to start a poetry prize in her name, then cutting from everywhere else to cover up her mistakes, leads to a vote of no confidence from the student body, leading to her impeachment.
Paul Lamb The Invisible Man
Actor: Jelka van Houten
- Brutal Honesty: Not afraid to dispense it.
- The Comically Serious: She's very, very straightforward and sensible. That's what makes her funny.
- Funny Foreigner: Averted. She's probably the most serious character on the show.
- Jerkass Woobie: Sabine's unfriendly treatment by the other house members makes you feel sorry for her. She makes a [[Heel-Face-Turn]] in Series 3.
- No Sense of Humor
- Only Sane Man: She often comes across as this when the other housemates are doing something particularly stupid.
- The Teetotaler: Doesn't drink, much to the shock of the other housemates, who admit they need alcohol to do just about anything slightly risky.
Actor: Faye Marsay
- Corrupt the Cutie: Vod and Oregon are doing their best on her.
- Hair of Gold, Heart of Gold
- Oop North: The only genuinely Mancunian member of the household, with a harsh accent to boot.
- Put on a Bus: In Series 4, she breaks up with Howard over the phone. Apparently they couldn't get Faye Marsay to return, because she's not seen or heard at all, we only hear Howard's side of the phone conversation.
- Token Good Teammate: In Series 3, she's pretty much the only housemate who doesn't act selfishly and doesn't do anything mean to the others, at least not intentionally.
Professor Tony Shales
Actor: Tony Gardner
- Dirty Old Man: When he's together with Oregon, he's portrayed somewhat sympathetically, but after their breakup he moves to this category, as he simply won't stop lusting after her.
- May–December Romance: Old enough to be Oregon's father, as evidenced by the fact that she dates his son.
- Sex with the Ex: Does manage to hook up with Oregon even after their breakup.
- Stalker with a Crush: Won't leave Oregon alone after they break up.
- Teacher/Student Romance: With Oregon.
Actor: Robert Webb
- One of the Kids: Despite being in his late 30s or early 40s, Dan is desperate to prove he's hip with the kids.
- Reasonable Authority Figure: Subverted. He tries to come across as this, but when he feels betrayed by his students (such as when Kingsley files an anonymous complaint on him), he becomes petty and vindictive.
Actor: Sophie Wu
- Put on a Bus: In the beginning of Series 3, Sophie goes to Hong Kong and abruptly breaks up with Kingsley, so Kingsley doesn't even get caught cheating on her with Josie. Though everything eventually comes out when she returns for one more apperance at Howard's birthday party.
- Red Oni, Blue Oni: She's the Blue to Josie's Red.
- Romantic False Lead: She starts off as this, dating Kingsley while Josie longs after him, but eventually she becomes rounded enough to escape the stereotype.