There are several plot-holes concerning Frankie's age in the series. If the webisodes follow the same timeline as the " New Ghoul @ School" special, she would have started school when she was 8 days old or younger. In " Party Planners", she turns 16 days old. For her to be consistently 16 days old, most of what happens in the webisodes would have had to have happened in the same day, although this can't be, as in " Frightday the 13th" she stayed overnight, which means she is a day older than what she is now. In " New Ghoul @ School", Frankie had a crush on Deuce Gorgon. This caused issues when she lied and told Deuce's real girlfriend, Cleo, that she was dating him. Cleo became very upset, thinking that Deuce had cheated on her, but the issue was later resolved when Frankie came forward with the truth and surprised Cleo with a Justin Biter concert. Cheerleading: Frankie is a great cheerleader(or “fear leader”) and does a lot of dancing and poses. Taking after her parents in the science department but not so much the responsibility department, Frankie has already created two other simulacrums herself: Hoodude Voodoo and gingerbread boy. As the former's surname suggests, they aren't considered part of the Stein Family, but the Steins have taken responsibility for them. At least in regards to Hoodude, it has been arranged that he gets to live at Kindergrübber's and it seems the Steins keep paying for his education and other needs.

In her ' School's Out' diary she has a crush on a Scottish gargoyle that plays football. She calls him "7", since she cannot remember his name. Self dismemberment: Frankie can remove all her limbs off her body. When doing so, she doesn't feel any pain.Lightning Immunity: If Frankie gets hit by lightning, no harm will come to her, instead, she feels refreshed. Skillset: Mattel's director for global brand marketing, PJ Lewis, stated that "Frankie's head mold it is a bit more square than the rest, as Frankenstein is known for having a square shape to his head." [3] In the Monster High books and TV specials, Frankie has five pet lab rats whom she calls the Glitterati; their names are Gwen, Gaga, Green Day, Girlicious and Ghost Face. They also appeared in " New Ghoul @ School" and " Fright On!".

She has light, mint green skin, and has a condition known as heterochromia which gives her odd-coloured eyes - one green, one blue (though likely from being assembled from multiple bodies, rather than genetics).

Spirit Halloween is the largest Halloween retailer in North America, with over 1,450 pop-up locations in strip centers and malls across North America. Celebrating nearly four decades of business, Spirit has cemented its position as the premier destination for all things Halloween. Known to many as an exciting and interactive event for shoppers, Spirit stores offer complete selections of costumes and accessories for infants/toddlers, children, 'tweens, teens, and adults, along with exclusive jaw-dropping animatronics and décor you won't find anywhere else. In fact, Spirit knows how to have so much fun, it's scary! Over the course of the first book series Frankie's over a year old. Her SDCCI 2010 diary describes her first day alive, while the regular diaries start on the day she has just turned 16 days. In " HooDoo You Like?" Frankie was concerned about being left out of the group for not having a boyfriend, and decided to make one for herself, creating Hoodude Voodoo. The ghouls explained that they would always be friends with her regardless of whether or not she had a boyfriend, and Frankie admitted that she didn't think that she was ready for boys just yet.