Kim Craig

Kim is often portrayed as lazy, rude and accident-prone. She is often seen lying down most of the time, shopping, escaping or snacking.

Kim often wears short T-shirts which allow her belly to show. Her fashion choices change frequently, at some points she wears comfortable clothing (e.g. baggy pants and a sweatshirt) and the rest of the time obsesses over herself in the mirror and talks about the latest fashion trends, which don't usually flatter her. Kim has long brown hair and a fringe and always wears make-up. Kim smokes and can be seen in the pantry of their Fountain Lakes Home, scouring it for food (usually which Sharon ends up taking and Kim reacts).

Kim is also seen reading Australian magazines such as New Idea and Famous.

Kim's outlook on herself appears to vary. Kath called Kim a “Stupid Girl”. She has called herself a "Yummy Mummy!"[3] and most of the time she refers to herself as a "horn-bag" and says that people would kill to be with "this" (referring to herself). However at other points in Kath & Kim she appears to be very unhappy with herself and self-conscious of her weight. This attitude contrasts with that of her mother, Kath, who is happy with her outward appearance and calls herself "high maintenance". Kim, like her mother, is currently unemployed and has a hard time trying to search for a job - let alone keep one, as illustrated by her constant hiring and firings from the call center. In the episode "The Moon", Kim's astrological sign is revealed to be Scorpio.

Brett, Kim's estranged husband, is played by Peter Rowsthorn. They are newly married at the start of the series and Kim leaves him after a few months, claiming her marriage is "Over! O-V-A-H!". Their relationship can be very superficial. Brett obviously loves Kim and always tries to show her affection; Kim frequently rejects him and only seems to show affection when she wants something. Brett cheats on her numerous times. However, they always reconcile. Frequently, he cancels, bans or major delays her hobbies or plans for Kim. This causes Kim to exclaim "I hate you!" or "I want a divorce!" to make Kim angry and upset.

In Da Kath & Kim Code, Brett cheats on Kim with his boss. Kim reacts badly for a few minutes but seems to not care later, accepting that her marriage was going nowhere. Brett's affair with his boss continues behind Kim's back.

Brett cheats on Kim with his 75 kilo Rottweiler Cujo in the episode "Gay", she reacts heavily and wants revenge on the Rottweiler.

When Brett cheats on Kim with Kylie & Dannii Bolton in the episode "Sport", she reacts heavily and wants revenge on the twins.

Kath Day

Kath Day-Knight, Kim's content fifty-year-old mother is played by Riley's co-star and creative Kath & Kim partner, Jane Turner. The relationship between the two is both good and bad. They often argue about various things, with Kath always referring to Kim as a "stupid girl". Growing up, Kim adopted a disrespectful attitude towards Kath, who was abandoned by Kim's father and Kath's ex-husband Gary Poole when Kim was baby. Despite this, Kim continues to take advantage of Kath. It appears she has no one else to go to besides Kath (and maybe her "second best friend", Sharon). Kim is always running back home to Kath and her new husband Kel, and lives with them by the end of the series. During the fourth season, Kim got to be such a bother to Kath and Kel that they opted to purchase their next-door-neighbour's mansion-like house, but were unsuccessful as no one auctioned to buy their own house.

Sharon Strzelecki

Sharon Strzelecki is played by popular Australian comedy actress Magda Szubanski who had previously acted in the international film Babe. Sharon is Kim's "second best friend". (Kim claims she has another best friend, "Tina" - who is subsequently never seen during the show.) Sharon and Kim are often seen "hanging out" together.

Kim takes advantage of Sharon's friendship and willingness to do absolutely anything to help her. Kim shows little respect or affection for Sharon. When Sharon shares her desire to track down her mother in the episode "Roots", Kim laughs and retorts, "why would she want to meet you!". In the same episode, Sharon meets her overweight model sister, Karen (Matt Lucas), but Karen bonds with Kim instead of Sharon. Whenever Sharon is seen crying, Kim always makes a rude remark. For example, when Sharon finds out that her "fiancee" is really just spam on a computer in Da Kath & Kim Code, Kim says, "oh Sharon... I knew you would never get married, I just knew it." Kim is exceptionally mean to Sharon, often zeroing in on her biggest insecurities such as her desperation to find a man, her weight, or her appearance - and then exploiting them. Despite the ups and downs, the two remain in an awkward and unequal friendship. After Sharon sleeps with Brett in the Season 4 finale "Lust", Kim tells Sharon that she's dropping her to sixth best friend.

Kel Knight

Kel Knight, Kim's metrosexual stepfather, is played by Glenn Robbins. From the beginning of the series Kim has an instant dislike of Kel, perhaps because Kath & Kim had each other all of their lives without a father/husband figure in place. Kim insists that Kel is "using" Kath for manipulative reasons, however she is proven wrong. Kim and Kel rarely interact, and when they do, the mood is "off" and the scene is completely awkward - with one muttering a single word to the other, and the other either walking away or trying to put on a smile. Kel is now the focus of Kath's attention, and this annoys Kim because she likes to always be the centre of attention wherever she goes.

Cujo is Brett's 75 kilo rottweiler. Kim has an intense dislike of Cujo and once bit her head for not getting off Kim's bed. Kim also once repeatedly tapped Cujo so she would jump off Epponnee's pram. Cujo hates Kim as well. In a Season 2 episode, Kim taps on the door and says to Cujo, "it's all right Cujo, it's just Kimmy". In response, Cujo starts barking until Brett tells her to be quiet.

Kim attended Fountain Lakes High, but left in year 10 (this was not an unheard of practice until fairly recently in Australia).

She also started a cake decorating course, but didn't complete it. Kath finished her cake for her.

She also started a nail design course, but didn't complete it.

Kim enjoys the idea of being a mother to Epponnee Rae, but does not show a lot of responsibility for her. Epponnee Ray is named after a dog (however, Kim says she'd already thought of this name and Kath "stole it"). Like most of her relationships, Kim lavishes affection on Epponnee Ray when she can be useful for something, such as Bubs Idol. On rare occasions, Kim will actually yell at the infant, telling her to stop crying so she could hear the television. Brett is seen giving more affection to their child and enjoys taking her to work, although he partially does this to help boost sales. Kath is also very good with Epponnee, taking care of her on occasions and creating a nursery for Epponnee just prior to her birth.

Kim believes that Epponnee Rae will be her ticket to a brighter future and grooms her to be a performer, despite the fact that Epponnee Rae is not even 6 months old. She manages to find Epponnee a position on the Australian Soap Opera Neighbours, however the gig fails due to Epponnee vomiting on Harold Bishop.

• Kath Day-Knight
• Sharon Strzelecki
• Kel Knight
• Brett Craig