| Character | Actor | Series | Notes |
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| Barney Harwood | Himself | 1-4 | A television presenter for the BBC (playing himself). He is the owner of the flat where he, Nev and Crazy Keith live. He and Beatrice have an on-off romantic relationship. He seems oblivious to the chaos Nev and Keith cause and, although he thinks Mr Prank is odd, he has never realized that Nev, Keith, Melanie and Mr Prank are enemies. His aunts are Barbara and Alice, his uncles are Rupert and Bert, and his cousin is Melanie. |
| Neville the Bear Nev, Nevvie | Ross Mullan | 1-4 | A small, blue, bear who likes ice cream, socks, jam and his "snuggly ducky duck duck". He has patches in places and is missing part of his ear after it was bitten by Bandit (Mr Prank's cat). Nev has trouble pronouncing certain words and when scared or intimidated, he growls, like a real bear. He once had a sword fight with Mr Prank. He has stopped Mr Prank from losing his job and twice from going to jail. He appeared at a TV presenter alongside Barney before the series. |
| Crazy Keith | Simon Buckley | 1-4 | An illegal immigrant Koala from Brisbane who lives under the floor boards of Barney's flat with his inanimate girlfriend Doris, with whom he converses. He is Nev's best friend, but often ropes him into hare-brained schemes, usually with the intention of stealing Mr Prank's secret ice cream stash. His existence is known only to Nev, Beatrice and Barney. As shown in Curse of the Were-bear he is part were-bear. He can speak a prehistoric language as shown in Cave-bear and he has not had a bath for years. He mentioned 3 times that koalas are an endangered species and he's very greedy. He adores Ice-Cream and pizza and often over-eats, meaning he becomes so fat he gets stuck. He has a brother called Dennis and an uncle called Bruce. In the episode Crazy Keith - Extreme Koala he was a surfing superstar in Bondi Beach where he met Doris. He has a friend called PC Stereotype. His catchphrase is "Oh, wackadoo!" |
| Beatrice | Allyson Brown | 1-4 | A college student and part-time ice cream van assistant, also known for her baking talent. She lives in the flat next to Mr Prank. Nev calls her "Beetroot". She and Barney have an on-off romantic relationship. She appears less in later series, only appearing in two episodes in series 3, and five in season 4. She is allergic to Daffodils and had once failed a college assignment. |
| Mr Andrew "Andy" Prank | Glen Davies | 1-4 | The caretaker of the block of flats that he Barney, Nev, Beatrice and Aunt Barbara live in. He also owns an ice cream van, which he tries to hide from Aunt Barbara, presumably because he is supposed to be attending to his caretaker duties. He is arch-enemies with Nev, to whom he is allergic. Nev, Keith and Melanie call him "(Mr) Angry Pants", a play on his name. As shown in The Strange Case of Mr Prank he may have German ancestry as Dr Gunter Von Prank had his surname. Although he would do anything to get rid of Nev, in Sing A Song of Secrets he loves Nev and would miss him. He once had a sword fight with Nev. He has a twin brother called Martin, and Crazy Keith mentioned he has a cousin called Benny who set his pants on fire. He has Scottish relatives called the McPranks, as seen in the episode "Sock Mess Monster". He used to be part of Boy Scouts and is the 33rd Putney Boys top animal tracker where he was called radar prank. He often mentions his mother or 'mumsie', whose picture he talks to. |
| Postie | Beverly Hills | 1-4 | The local postwoman, who has an on-off love relationship with Mr Prank. She is also best friends with Beatrice. She once nearly married Mr Prank, only to discover he was attempting to steal her lottery win money which was only a £5 voucher which Mr Prank gave to Aunt Barbara to replace the flowers he damaged. It is unknown what her real name is. |
| Aunt Barbara | Bella Emberg | 2-4 | Aunt Barbara is Barney's aunt, and Uncle Rupert's and Aunt Alice's sister. She dislikes Mr Prank, calling him "a useless caretaker", or a "caretaker, caretaker, couldn't-care-less-taker". She also has a sight problem, often referring to Nev as a dog and a hearing problem, calling Mr Prank Plank despite repeated corrections. She also has a crush on Bill Oddie. She is a minister of the High Church of the Convenient Coincidence as shown in ‘'Yummy Mummy'’. She almost married George the mummy in Yummy Mummy until she discovered him cheating on her with Mr Prank dressed up as a girl mummy. She frequently hits Mr Prank with her handbag, which is comically capacious, capable of carrying Chops (her pet) and many huge ornaments, paintings and kitchen utensils. She can also play Reveille on the trumpet. She is strong as she is capable with hurting Barney, lifting Mr Prank up and crashing down doors with or without Mr Prank in tow. She used to be a member of the Girl Guides and she always notices when Mr Prank or Melanie misbehave. |
| Melanie | Shyanne Sanders | 2-4 | Melanie is Aunt Barbara's niece and first cousins with Barney. Nev calls her "Smelanie". She often helps Nev and Crazy Keith carry out acts of revenge on Prank. She is a school pupil with a passion for sports. She is 10 in series 1 and 13 in series 4. She is often forced to wear Aunt Barbara's ugly dresses. |
| Uncle Rupert | Geoffrey Whitehead | 1-4 | Uncle Rupert is the owner of the block of flats in which Barney and Nev live. Barney has a picture of Rupert on the wall of his kitchen. Rupert has a stash of treasure which will be bequeathed to Barney when he dies. |
| Snuggly Ducky Duck Duck | Bradley Yates | 1-4 | Snuggly Ducky Duck Duck is Nev's soft toy duck who snuggles with Nev in his bed. Nev would do anything to save him if he got caught or stolen (except be nice to Mr Prank for the rest of his life). |
| Mr Cuddly Wuddly | A Stuffed Toy | 1-4 | Mr Cuddly Wuddly is like Snuggly Ducky Duck Duck but Mr Cuddly Wuddly is Barney's and looks a lot like Nev. |
| Bouncer Boy | Gregory Foreman | 1 | Bouncer Boy is Mr Prank's nephew. He is the original owner of Bandit, however, when he left the country with his mother to go travelling, Mr Prank ended up looking after him. Bouncer Boy only appeared in Series 1. He would often assist Mr Prank in his schemes. |
| Bandit | Gregory Foreman and sound FX | 1-4 | Bandit is a large, orange tabby cat, formerly owned by Bouncer Boy. He now resides with Mr Prank. He is responsible for the damage caused to Nev's ear as revealed in Operation Nev. |
| Doris | Stuffed Toy | 2-4 | Doris is a small pink and purple bunny rabbit, who is in a relationship with Crazy Keith. Doris originally resided in Australia with Keith. Although she is not, Keith likes to pretend she is real. Despite her muteness, she seems to be very persuasive, as Keith will often go great lengths to impress her. She is often told ironically by Keith "not to move a muscle". |
| Squealers | Sound FX | 1 | The Squealers are some of Keith's toy buddy's like Doris but did not appear when Doris was around as Keith either ditched them or they left, probably because Doris might be scared of them or there just wasn't enough space for them in Keith's tiny lair. |
| Chops | A dog and Sound FX | 2-4 | Chops is Aunt Barbara's dog which lives inside a handbag and came out of the handbag twice. The first time Chops came out of the handbag everybody loved him more than Nev so Nev got him in the handbag but Bandit was inside as well so Nev got Bandit out of the handbag. Then Nev came out with Chops and got congratulated. |
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