List of Neighbours characters introduced in 2003

Lisa Jeffries, played by Rhiannon Fish, made her first on-screen appearance on 13 May 2003. Lisa was Summer Hoyland's (Marisa Siketa) best friend. Lisa was Fish's first screen role and she joined the cast when she was eleven years old. Lisa was initially supposed to be Australian, but after Fish was cast, the writers made her Canadian. Fish said that she loved playing Lisa and that she "got to do lots of awesome things." She described her character as being "selfish and mean" and said that she enjoyed Lisa turning into a "total bitch." Fish said that people may feel sorry for Lisa and that some scenes showed that it was her mother that had made her into a horrible girl.

Summer Hoyland makes friends with Lisa at primary school, after they both join the girls' soccer team. They try and persuade Jack Scully (Jay Bunyan) to coach them full-time, but he just teaches them some tricks. Jack later decides to take on the role of assistant coach. Lisa joins Summer's family for a trip to the beach and she and Summer go off to look for treasure and the walk onto a nudist beach. Lisa and Summer later join a pony club. When Summer's father, Max (Stephen Lovatt), splits up with Stephanie Scully (Carla Bonner), Lisa begins picking on Summer. She tells her that Max is too old for Steph and the girls fight. Summer tries to apologise, but Lisa tells her that she is no longer invited to her birthday party. During an orientation day at Erinsborough High, Lisa is paired up with Summer's brother, Boyd (Kyal Marsh), who threatens to flush her head down the toilet if she continues to bully Summer. Lisa then reports him to Susan Kennedy (Jackie Woodburne).

At their next soccer game, Lisa and Summer make up when Summer passes the ball to Lisa and she scores the winning goal. Lisa notices that Max is sad and she tells Summer that it was the same with her mother, when her father left her. Lisa and Summer then decide to get their parents together, so they can be sisters. However, Max and Lisa's mother, Andrea (Gail Beker), have nothing in common. When the girls start at Erinsborough High, they are laughed at for having their socks rolled up and they struggle with the large building. Lisa passes a note around her class about Susan's divorce and even after she is caught, she continues writing more nasty notes. Summer refuses to laugh at the jokes. Summer meets a new boyfriend, Caleb Wilson (Joss Kasper), who gives her expensive gifts. Lisa does not believe that Caleb exists, but she is shocked when he turns up at school to meet Summer for lunch. Lisa is then humiliated when she tries to flirt with Caleb and he rejects her. Lisa begins hanging around with her boyfriend and she encourages Summer to smoke. Summer refuses and Lisa calls her a loser, ending their friendship. Summer starts hanging around with Penny Weinberg (Sally Kingsford) and Lisa steals Penny's diary and reads it out to everyone. Provided by Wikipedia