Mabel Pines

Mabel Pines is a bouncy, energetic, optimistic, hyperactive, enthusiastic, and free-spirited 12-year-old girl spending the summer with her Great Uncle Stan in Gravity Falls, Oregon, where she and her brother frequently encounter the supernatural, and is soon joined by other children with similar experiences.

Being the the happy-go-lucky one of the group, she takes a much less serious approach to life than her brother and some of her friends as she navigates her way around odd, new surroundings.

Physical Appearance
Mabel is a short 12-year old girl, exactly one millimeter taller than her twin brother. She has round blushing cheeks, long brown hair that reaches her hips, her eyes are the same brown as Dipper's, and she has silver-colored braces. Mabel's apparel varies for each appearance, more so than any other character's, with at least one new outfit usually consisting of a sweater, undershirt, skirt, headband, black shoes, white socks, and occasionally earrings, though she does deviate from this look occasionally.

Personality
Mabel Pines is an optimistic, fun, and energetic girl full of spirit. She is an optimist who skips through life with a braces-filled smile and an assortment of extremely colorful knit sweaters. It is her outgoing personality and fearless curiosity that comes in handy when her friends needs help solving a mystery, even if she isn't always aware of her silliness. Mabel is aware of her charm, and cherishes her cuteness and beauty.

She is a preteen dreamer with a world filled with preteen novels (mostly about vampires), and her fixation on finding her one true love occasionally lands her in sticky situations which ultimately require her brother's help. Still, despite all the weirdness in Gravity Falls, Mabel is always a "glass-half-full" kind of girl. She is rarely angry or upset, and generally keeps a positive outlook. She is somewhat naive at times.

Mabel is aware of her charm, and cherishes her cuteness and beauty. She has also shown to be self-righteous in her decisions, which can be far from justified, or they may accidentally backfire in some way.