Operetta is based on The Phantom of the Opera. The story, by French writer Gaston Leroux, was first published in serialized form in 1909 to 1910. It was eventually turned into a novel which lead to many stage and film adaptations, most notably Andrew Lloyd Webber's smash 1986 musical. The most recent film adaptation was seen in 2004, directed by Joel Schumacher.
The story revolves around Christine, a young woman who sings in the chorus of the Paris Opera House. She begins to hear beautiful singing from below the House's stage. This is Erik, the titular Phantom. Scarred and unstable, he kidnaps Christine to the cellars below. Things build from there, a love forms, and it all ends in tragedy. It's a wonderful story; I'm not a musical person but I really enjoy The Phantom of the Opera.
In the show Operetta speaks with a long southern drawl and spends her time in the catacombs mostly (which works as a nice analogue to her father's location at the Opera House). Initially Operetta had some of the best lines of the series - "Do I even know you?" she once responded to an outraged Cleo. She also had several subtle pop culture references in her dialogue, most notably when she referenced lyrics to Dolly Parton's "Jolene" in one episode. It has also been established in both her diary and on the show that people can't hear her live singing voice because "it does things to people". It's never made entirely clear what it does, but it's implied that it's bad. Therefore people can only hear her singing voice on recordings, made by Operetta in a makeshift studio she has set up in the catacombs.
Operetta fast became one of my favorite characters on the show thanks to her long introductory story arch and her general coolness. Unfortunately since then it's been downhill for the character, at least as far as the webseries is concerned. I really wish they'd go back to the serialized storylines in the webseries -- it gave the characters more depth and was in general simply more interesting than the one-off approach they take now.
Operetta has had five dolls released to date. There are a few mainstays of every Operetta doll: red hair with black streaks, a scar of musical notes that cascades down the left side of her face onto her neck and arm, red and black tattoos on her left arm, a mask in the shape of a heart, a color scheme of red, black, and white with the occasional purple, and a general 1950's vibe to her clothes. She has a style motif of piano keys, dice, and spiderwebs. You'll also find the occasional purse or belt buckle featuring grooves that mimic a vinyl record.
Some say her style is psychobilly but I don't see enough of the punk influence to signify that; to me she's pretty straightforward rockabilly. Whatever the case, she has a cool look and her dolls usually stand out from the others. My biggest problem with Operetta dolls is the quality of the hair. Her basic doll had an amazing set of victory rolls framing her face but the hair in the back was of very poor quality. Her next three dolls all sported ponytails, fitting of the era she's emulating, but a bit boring. And of the those three only the Kohl's doll had good quality hair. Her newest doll, from the Dance Class line, doesn't have a ponytail and the hair quality is improved but still not perfect. Rumors abound that a Picture Day Operetta doll is on the way -- hopefully she'll live up to the potential that this unique, fun character has.