Frankie Stein

Mattel's fashion doll franchise Monster High features a variety of fictional characters, many of whom are students at the titular high school. The female characters are classified as Ghouls and the male characters are classified as Mansters. The characters are generally the sons and daughters, or related to monsters that have been popularized in fiction. The franchise's official website identifies six of the characters as Original Ghouls. In addition to the listed Ghouls and Mansters, there are other characters who have been introduced in the franchise's related media including the web/video and book series. In 2016, singer Lady Gaga's sister Natali designed Zomby Gaga for the Monster High franchise as a partnership with the Born This Way Foundation.

The initial characters were created by Garrett Sander and his twin brother Darren. In researching the look, the Sander brothers went shopping with girls and noted they were buying goth fashion items such as skulls, chains, and black. They remarked that because the characters are monsters, they had more freedom to do things that ordinary kids could not do. Other inspirations include children's interests in Tim Burton and Lady Gaga. Kiyomi Haverly, Mattel's design vice president, said "Honestly, it was very surprising to us. We just noticed girls were into darker goth fashion." The dolls were created by Garrett Sander and illustrated by Kellee Riley. Other doll designers include Rebecca Shipman and Natalie Villegas.

Six of the Monster High characters have been classified as Original Ghouls by the official website.

Frankie Stein (voiced by Kate Higgins in 2010–15,Cassandra Morris in 2016–present) is the daughter of Frankenstein's monster and his bride and the granddaughter of Victor Frankenstein's (since Victor had built her parents). Frankie is the sweetest, heartiest girl at Monster High, and believes that everyone's flaws make them unique. Starting at 15 days old, she is also the youngest student at Monster High. She is very optimistic and never gives up in the face of adversity. However, since all of her prior knowledge about teen relationships came from magazines, she can be a bit naive and inexperienced in teenage issues.

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