!'''Ben Harper''' (Robert Lindsay)
* OnlySaneMan: Sometimes takes on this role.
!'''Susan Harper''' (Zoe Wanamaker)
* OnlySaneMan: Sometimes. Not as often as she'd like to think, though.
* WomenAreWiser: Subverted. She likes to ''think'' she is this, but in reality she's just as crazy as Ben.
!'''Nick Harper''' (Khris Marshall)
* ObfuscatingStupidity: Occasional moments seem to hint he is this.
* WhyDoYouKeepChangingJobs: An example of a main character being this, in a running joke that he could never keep a job for more than a day.
!'''Janey Harper''' (Daniela Denby-Ashe)
* BigEater: She is shown to be this in the future, where she has become enormously obese.
* BrattyTeenageDaughter: In earlier seasons.
* FourthDateMarriage: Janey marries a guy she's known for only ten days, because they met at a wedding where a fortune teller said Janey would meet her true love. [[spoiler: She runs off with someone else and asks for a divorce on the same day.]]
* ObfuscatingStupidity: Janey, who studied French, Economics and History at A-Level and went on to university, is a clear-cut example of this trope.
* SoapOperaRapidAgingSyndrome: Janey is 15 in the first series, gives birth to Kenzo in series four when she is 19, but by the time of series 11 is "almost 30"
!'''Michael Harper''' (Gabriel Thomson)
* ChildProdigy: At the beginning of the show.
** TeenGenius: Later became this.
* [[LittleMissSnarker Little Mr Snarker]]: In the earlier seasons.
* MommasBoy: Not to extreme levels, but some episodes do draw attention to it.
* OnlySaneMan: Usually. Not always though.
* SuddenlySexuality: After nine seasons of being consistently attracted to women, he suddenly came out as gay in the tenth season.
!'''Roger Bailey''' (Kieron Self)
!'''Abi Harper''' (Siobhan Hayes)
* SuspiciouslySimilarSubstitute: For Janey.
!'''Alfie Butts''' (Rhodri Meilir)
* SuspiciouslySimilarSubstitute: For Nick.
!'''Kenzo Harper''' (Tayler Marshall)
* [[LittleMissSnarker Little Mr Snarker]]
* PromotionToOpeningTitles: In Season 10.