|Tracy Beaker||Dani Harmer||1-5||Central character of the series|
|Justine Littlewood||Montanna Thompson||1-3,4,5||Second central character|
|Louise Guvan||Chelsie Padley||1-3||Friend to Tracy and Justine|
|Adele Azepadi||Rochelle Gadd||1-2||An Older girl who eventually moves out|
|Ben Batambuze||Luke Youngblood||1-2||A child with a rich background|
|Ryan||Sonny Muslim||1||Twins with Zac|
|Zac||Jay Haher||1||Twins with Ryan|
|Peter Ingham||Joe Starrs||1||Friend of Tracy|
|Maxi||Jerome Holder||1||Friend of Peter|
|Duke||Clive Rowe||1-4||Dumping Grounds resident chef. Leaves to be with his family|
|Mike Milligan||Connor Byrne||1, 5||Assistant Care Worker leaves then Chef and later Head Care Worker|
|Elaine Boyak||Nisha Nayar||1-5||Resident Social Worker|
|Jenny Ruth Edwards||Sharlene Whyte||1-2||Head Care Worker 2002 - 2003|
|Cam Lawson||Lisa Coleman||1-5||Journalist and Tracy's foster mother|
|Dolly||Chloe Hibbert-Waters||2-3||A small hyper girl|
|Amber Heast||Alicia Hooper||2||Elder girl who is a bad influence|
|Bouncer Plakova||Ben Hanson||2-5||Trainee chef, brother of Lol|
|Lol Plakova||Ciaran Joyce||2-5||A wheeler dealer, brother of Bouncer|
|Nathan Jones||James Cartwright||2-3||Trainee Care Worker|
|Michael||William Tomlin||3||An unpopular snitch|
|Marco Maloney||Jack Edwards||3-5||A boy who likes to wear costumes|
|Crash||Darragh Mortell||3-5||Friend of Tracy, has anger problems|
|Jackie Hopper||Abby Rakic-Platt||3-5||Friend of Tracy, trainee athlete|
|Layla||Cara Readle||3-5||A girl with CP|
|Hayley||Kristal Lau||3-4||A quiet girl who befriends Layla|
|Shelley Appleton||Nichola Reynolds||3, 5||Head Care Worker, 2003-2004 then Acting Head Care Worker 2006|
|Roxy Wellard||Sophie Borja||4-5||Brains of the Wellards|
|Rio Wellard||Craig Roberts||4-5||Muscle of the Wellards|
|Chantelle Wellard||Deepal Parmar||4, 5||Eldest of the Wellards|
|Wolfie||Felix Drake||4, 5||A rich kid who likes to live wild|
|Sid Rooney||Vincenzo Pellegrino||4||Head Care Worker 2004-2005|
|Milly||Holly Gibbs||5||Likes to dress up, rarely speaks|
|Rebecca Chalmers||Georgina Hagen||5||Rival to Justine|
|Alice||Olivia Grant||5||Young hippy girl who believes in fairies|
After another failed fostering, Tracy Beaker (Dani Harmer), a scruffy ten-year old with behavioural problems is dragged kicking and screaming back into her former care home, Stowey House, under the watchful eye of head care-worker, Jenny Edwards (Sharlene Whyte), residential cook and gardener, Duke (Clive Rowe), assistant care worker, Mike Milligan (Connor Byrne) and annoying social worker, Elaine 'The Pain' Boyak (Nisha Nayar).
Upon her return she finds that her former best friend, Louise Guvan (Chelsie Padley) has befriended Tracy's nemesis, Justine Littlewood (Montanna Thompson), who is determined to make her life Hell. Tracy is also commonly annoyed by Peter Ingham, (Joe Starrs), a young boy, around six or seven, who coincidentally shares Tracy's birthday. He considers them to be best friends but Tracy has other ideas. Other residents in the care home are money-making twins, Zac (Jay Haher) and Ryan (Sonny Muslim), stroppy, but good-hearted teenager Adele Azepadi and Peter's hyper friend, Maxie (Jerome Holder).
And then there's Cam Lawson, (Lisa Coleman), journalist and wannabe writer, whom Tracy believes is the perfect foster parent.
Tracy has also befriended boy-on-the-street, Ben Batambuze (Luke Youngblood) who is eventually found out to be a normal boy with a normal family, albeit an extremely wealthy family, which puts strain on his relationship with Tracy,
The main story arcs involve Tracy's bids of becoming Cam's daughter, Peter's eventual befriending of Tracy, Tracy and Justine's rivalry, Mike's being transferred to another home, and Ben's pampered lifestyle being discovered. By the end of the series, Tracy moves in with Cam, her dream finally being fulfilled...
The main story arcs involve Ben's aunt and uncle offering to foster Tracy, Nathan's passing of his test to become a fully-qualified care-worker, Amber finally finding a suitable family and Tracy making up with Cam.
This series saw the exit of Jenny and a new head careworker called Shelly Appleton. Nathan also returned to the Dumping Ground as a careworker.