Serena is Samantha's cousin on Maurice's side. Serena looks like Samantha, with a few notable exceptions. She has raven black cropped hair, sports a tattoo under her left eye which changes from one episode to another, often referencing the episode theme, and wears mod mini-skirts.
Serena's personality is, however, the antithesis of Samantha's. Egocentric, ever mischievous, irresponsible, and somewhat bawdy, she often flirts with Larry Tate (calling the white-haired Tate "Cotton-Top") just for sport. She occasionally dates mortals and has been known to flirt with Darrin while pretending to be Samantha. Despite her conduct and frequent co-plotting with Endora, Serena has been known to assist Samantha and Darrin, although she finds them "both a bit square".
