Amber is a girl in the popular clique but fulfills the stereotype of popular girls, being snobbish, mean-spirited and spiteful. She is despised by both Cher and Dionne and is in constant competition with Cher throughout the film when it comes to style, popularity, and boys. Cher dubs her a "Monet" (just like the painting, "from far away it's okay, but up close it's a big old mess.") Amber coexists with Cher, Dionne, and Tai (post makeover), despite her snobbish attitudes and bantering. She is apparently a spoiled daughter even by Beverly Hills standards, though her family members are not seen on screen until late in the TV series' run. Her parents, Tripp and Ginger, have a rocky relationship. Tripp Mariens is a weak-willed, cowardly man who dotes on his daughter and repeatedly gives into her constant whims and demands, whereas Ginger Mariens is a fearsome battleaxe who sees Amber for the pampered, manipulative brat that she is.
She is based on the Emma character Augusta Elton.
Amber is a snobbish, style-obsessed redhead who dislikes Cher and often belittles her fashion and lifestyle choices; this dispute is driven in part by the girls' competition for popularity and style supremacy. Despite their disputes, Cher and Amber often end up in the same social situations, as they both move in similar social circles. Despite Amber's profession to be a style leader, she often ends up aping Cher, such as attending a party in a dress similar to one which Cher had worn earlier.
- "Miss Stoeger, my plastic surgeon doesn't want me doing any activity where balls fly at my nose."
- "She could be a farmer in those clothes."
- "Mr. Hall, how can I answer that? The topic is Haiti and she's talking about some party."
- "If she doesn't do the assignment, i can't do mine."
During the TV series it is revealed that Amber's middle name is "Princess".
During the TV series, Amber and her family briefly move into Cher and Mel's house (which is supposedly larger and grander than Amber's family home) following Mel's financial failure ("Bakersfield Blues"; however, they subsequently move out when Cher and Mel return to Beverly Hills.