Lou Carpenter is a fictional character from the Australian soap opera Neighbours, played by Tom Oliver. He made his first screen appearance on 30 March 1988. Oliver appeared for a brief time, having been initially contracted for six months, before leaving and returning in January 1992 as a regular cast member. In 1996, Lou was written out of Neighbours, a move that shocked Oliver as his character had become popular with fans. Neighbours viewers created petitions calling for his return and the strength of their reaction caused the producers to reconsider their decision and reinstate Oliver. Lou became one of the longest-serving continuous characters in the serial's history, having played the role for 24 years.

Harold Wayne Bishop is a fictional character from the Australian soap opera Neighbours, played by Ian Smith. The character was loosely based on the UK’s Jon, and to a lesser extent his younger brother, Jim White. Smith was offered the role by the show's creator and executive producer Reg Watson. Smith made his first screen appearance as Harold during the episode broadcast on 30 January 1987. He departed in September 1991, but returned five years later in October 1996. Harold remained on screen for over twelve years, making him one of the longest-running characters in the show's history.