Esmeralda

 is a witch who becomes the Stephenses' housekeeper in 1969. Endora suggests to Samantha that she should have a witch as a housekeeper to make things easier during her second pregnancy.

Esmeralda's powers are faulty due to nervousness and anxiety so she often accidentally causes trouble with her magic. For example, when she sneezes she usually manifests something unexpectedly. When she gets anxious she also fades and becomes invisible. This is usually because Darrin makes her nervous.

Esmeralda often takes care of Tabitha and Adam, especially when Samantha and Darrin go to Salem in 1970 and Europe in 1971. Darrin's mother, Phyllis, thinks she is a wonderful maid.

Trivia
Esmeralda played by Alice Ghostley is considered the spiritual replacement for Aunt Clara because she was created after the death of Marion Lorne as the producers felt that the role of Aunt Clara could not be replicated by another actress.