Mabel

16 years old and in Gravity Falls High School in Oregon. She has long brown hair that is braided and goes down to her waist. She is wearing a sweater with a star pattern and denim shorts. She also has a bunch of colorful bandaids on the exposed skin of her legs, and her socks are purple and pink and are two different lengths and patterns. Her shoes are dirty pink converse. She also has brown eyes like her twin brother Dipper.

Mabel is an energetic, fun, bouncy, hyperactive, enthusiastic and free-spirited girl. She is an optimist who skips through life with a braces-filled smile and an assortment of extremely colorful knit sweaters. It is Mabel's outgoing personality and fearless curiosity that comes in handy when Dipper needs help solving a mystery, even if she isn't always aware of her silliness.[31] She shows a more sophisticated attitude when it comes to art.[4]

Despite all the weirdness in Gravity Falls, Mabel is always a "glass-half-full" kind of girl.[32] She is rarely angry or upset, and generally keeps a positive outlook. Despite her cheerful attitude, Mabel is shown to be quite sensitive, as she can occasionally get her feelings hurt, especially by her rival, Pacifica Northwest.[31] She is somewhat naive at times. She avoids lying[13] and is a terrible liar, often blurting out whatever it is about which she is trying to lie.[14]

Mabel is aware of her charm and cherishes her cuteness and beauty.[5] She generally has a high opinion of herself, considering herself "irresistible" to boys ("Tourist Trapped"), claiming that she does everything perfectly ("The Time Traveler's Pig"), and fully believing she is of "pure, perfect heart" ("The Last Mabelcorn").

Mabel has also on occasion made mistakes that accidentally backfire in some way. For example, she shoves her brother in a closet with Wendy in "Into the Bunker" so that he could end his anxiety and admit his crush on Wendy. This unintentionally endangers them when they encounter a dangerous creature. Also, in "The Love God," she also caused Wendy's friend group to temporarily break up after she had made Robbie Valentino and Tambry date each other. However, like her brother, Mabel has the best of intentions and she will always try to choose the right options for the happiness of herself and others. She also proves to be clumsy, as in the episode "Soos and the Real Girl," when Mabel was playing and suddenly collides with the front door of the Mystery Shack and gets a brace stuck on the metal door.

Mabel is a preteen dreamer with a world filled with preteen novels (mostly about vampires), and her fixation on finding her one true love[8] occasionally lands her in sticky situations. She sometimes has her moments of self-centered behavior, most notably when it comes to boys with whom she's infatuated with. In episodes like "Sock Opera" and "Boyz Crazy," she has been known to prioritize her own desires over that of others, but she, in the end, owns up and accepts her mistake. Another similar occasion is in "The Time Traveler's Pig," where she makes Dipper sacrifice his chance with Wendy to let her win Waddles (though Dipper in that episode has been explained by Alex Hirsch as being in the wrong given his manipulation of time to achieve a goal that only pleases him).[33] In the book Gravity Falls: Lost Legends, it is revealed in the story "Don't Dimension It" that after being stranded in an in-between world full of alternate versions of herself, Mabel realized, due to being stuck with multiple versions of herself who all act in their own interest against her, how self-serving she sometimes acted. However, given the events of Lost Legends are considered canonish, it is up to the individual to decide whether or not the events in this story really occurred.