Karl Kennedy is a fictional character from the Australian soap opera Neighbours, played by Alan Fletcher. The actor previously appeared in the soap in 1987 as mechanic Greg Cooper. He made his first screen appearance as Karl during the episode broadcast on 20 September 1994. Karl and his family were created by Neighbours storyliners in an attempt to bring the show back to its roots. Karl was given the job of local GP to provide him with immediate links to other characters. Debuting shortly before his wife, Susan Kennedy, he is the longest running continuously appearing character in the series' history.

Billy Kennedy is a fictional character from the Australian soap opera Neighbours, played by Jesse Spencer. He made his first appearance on 27 September 1994, arriving in Ramsay Street with his family. He departed on 5 April 2000, but made a small cameo for the show's 20th anniversary episode broadcast on 27 July 2005, and for the show's then final episode on 28 July 2022.