Erica Minx was born to Sarah Minx and her ex-boyfriend. Three years later her sister Jennifer was born. Erica loved her mother and sister, but wished her and Jennifer's father would return. At the age of 5, Erica and Jennifer's long lost older half sister Eve Minx returned. Erica was hydrophobic, but her mother tried to teach her to swim, while Erica was in the pool, she got tired but was too scared to exit the pool. Sarah was too busy reconnecting with Eve to hear Erica calling out to her, and Erica drowned. Erica's untimely death caused Sarah to go into therapy, and Erica to wait for her revenge as a ghost. Erica despises her mother now and is planning to haunt her forever. She also blames Eve for distracting her mother, and was partly happy when Eve died.
- Before Erica's death, she was friends with Opal Suarley, a ghost who she visited at the graveyard everynight with her mother. Opal is also a child who died of drowning.