She is portrayed as kind and naïve, but her naïvety or naïveté, makes her unaware of average teenage life, and uses source on teenage "unlife" or "teenage lives" through magazines; though what she looks up to is never actually accurate to how things really are in real life or to the situation she's in.
Frankie is best friends with Draculaura, Clawdeen Wolf, Cleo de Nile, and Lagoona Blue.
Having been born as a 15-year old only recently, Frankie may have the intelligence and physical capabilities of her born-age, but she does not have the appropriate life-experience.
She has been rapidly gaining ground, though, mostly with the support of the close group of friends she created around herself.
Frankie Stein is a 2010/2016-introduced and all-around character.
She is a simulacrum, specifically the daughter of Frankenstein's monster and his bride, and a student at Monster High.
This makes the original Monster of Frankenstein (usually referred to as just Frankenstein) Frankie's grandfather and his Bride Frankie's grandmother, while Victor Frankenstein is thus her great-grandfather.