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.

Brett Stark is a fictional character from the Australian soap opera Neighbours, played by Brett Blewitt. He made his first appearance during the episode broadcast on 30 November 1993, along with his sister, Danni Stark, and remained as a regular in the show until 8 March 1996. Blewitt returned as Brett for five weeks after the death of his on-screen mother, Cheryl. He departed along with Danni on 13 November 1996 and made a further cameo appearance in 2005 during Annalise Hartman's documentary about Ramsay Street, as part of Neighbours twenty-fifth anniversary. Blewitt again reprised his role from 4 December 2023. During his period in the serial he was portrayed as a "geek", a word that defined the character throughout his casting, storylines and perception among other characters. He had close friendly relationships with older women, including Susan Kennedy and Helen Daniels; he developed a crush on the latter, which generated bad reception from some. He went on to have an affair with an older woman named Judy Bergeman. He is an animal lover and was the owner of Dahl, the Galah who resided with the Kennedy family until 2014.