Donna Freedman is a fictional character from the Australian soap opera Neighbours, played by Margot Robbie. She made her first screen appearance during the episode broadcast on 2 June 2008. Donna was initially introduced as a guest character, but Robbie was promoted to the regular cast shortly after she made her debut. Donna was originally portrayed as an obsessive fan of musician Ty Harper and someone who had a desire for friends and acceptance. After befriending the teens of Ramsay Street, Donna changes her ways and matures into a warm, loveable girl. She has been described as being fiery, beautiful, kooky and confident.

Sunny Lee is a fictional character from the Australian soap opera Neighbours, played by Hany Lee. She made her first screen appearance during the episode broadcast on 8 April 2009. Sunny was created by executive producer Susan Bower in response to criticism that Neighbours was "too white". Lee came to the attention of Neighbours producers after she entered a competition run by Dolly Magazine to win a three-month contract with the show. Despite not winning, she was cast as Sunny soon afterwards. In August 2009, it was announced that Lee and Sunny would be departing Neighbours and Sunny made her final appearance on 19 November 2009.