Kieth

An illegal immigrant koala from Brisbane who lives under the floor boards of Barney's flat with his inanimate girlfriend Doris, with whom he unironically involves himself in conversations with. 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 as a result of his extreme greed. Kieth adores ice-cream and pizza, and he often indulges in the sin of glutton, eating to the point he is too fat to even leave his floorboard hovel.

His existence is unknown to everyone, including the legal authorities, the tax office, health and safety, and the landlady of the flats. Only Nev, Beatrice and Barney know of his residence under the floor. As shown in Curse Of The Were-Bear, he is part were-bear, and presumably as a result he can speak a prehistoric language (as shown in Cave-Bear). He is very dirty, only being shown to even own a bath when his toy rabbit girlfriend Doris is using it. Despite the fact he lives rent-free, he hasn't bothered to get a stable job, instead briefly having side businesses such as as a radio host in order to fund his love of indulgent furnishings like his large barbeque (that he uses under the floorboards of Barney's flat, putting the entire complex at great risk). He has mentioned three times that koalas are an endangered species, but doesn't seem to perform any action to raise awareness beyond that nor does he try to breed for the good of his species. He has a brother called Dennis and a uncle called Bruce, although due to his exodus back in the land of poms it can be presumed he is not welcome amongst his own kind. Despite the fact he is called Krazy Keith, personality-wise he isn't particularly crazy, tending to be more random but calculating.