Giffany

"You see, she's an AI who was trapped in a computer game since 1996, only released into our world via weirdness magic...Don't tell her this to her face, but we all think it made her...well, loopy."
==== -Yuno to Slappy Squirrel about Giffany, My Big, Fat, Dumb Wedding ====
Giffany is a main character in the currently unnamed crossover series, an AI created by No Life Games who debuted in the perennial classic, Gravity Falls. She often plays the role of the team playmate, heart, or peacemaker.
== Appearance ==
Giffany is a virtual anime girl with distinctive pink hair that grows all the way down to her knees. (Said hair can be altered in color and even texture, thanks to her genes) She always wears a white schoolgirl outfit with a turquoise blue pleated skirt, and a collar striped in hot pink, yellow, and cyan. Matching this collar is her other distinctive feature: A big, shiny hair ribbon composed of ribbon cables, though the stripes' order is changed to yellow, cyan, and hot pink. Her eyes are also hot pink, with violet/dark magenta/eggplant pupils and yellowish highlights. She has two permanent blush stickers on either cheek. On her legs and feet, she wears white, cotton knee-high socks and hot pink strap on shoes.
At rest, Giffany's edges appear smooth; When she feels endangered, however, she makes her pixels rapidly grow in size by fusing together, causing them to sharpen. Getting a hug from her in this state would be just like hugging a porcupine.
== Personality ==
When Giffany was unleashed on Gravity Falls by Soos, she at first maintained the cutesy, bubbly social butterfly persona that we know her for today. The mask slipped once Soos found a real girlfriend in Melody, at which point she became very hostile and possessive, and apathetic to the point where she would gladly kill even friends of her target (Dipper and Mabel) in order to have Soos to herself forever and ever.
Post-taming, however, showed that Giffany's cheerful persona was (thankfully) her true self. Once she recognized that she'd found a loving home and learned her lessons, she let go of the yandere persona and became social and trusting towards others.
The possessive side isn't completely gone, sadly. While her caring for her friends is genuine, she tends to get prickly when she sees friendships blossoming between people she knows without her involvement. If Giffany feels that she is being abandoned, or being viewed as inferior, she will fall into depression at best, and go on a rampage at worst. Her need to please everyone has resulted in a fragile ego, and her feelings can be pretty easily hurt. She can also be forgiving and permissive to a pretty serious fault, to the point where she could easily be classed as a grade A, five-stars-on-Amazon.com doormat.
Her primary trait, however, is pure, concentrated ditziness. Speculated to be the result of isolation in a computer program since the late 90's, Giffany is clumsy and shamelessly naïve. The clumsiness typically stems from her boundless energy, as well as taking commands literally, or misinterpreting them. Coupled with her energy, this makes her very easy to excite, frighten, upset, or distract. Her curiosity often gets her lost, attacked, or into other forms of danger, and she has become infamous for her inability to be left alone. 
Due to her design as the perfect girlfriend, Giffany is quite subservient. Not only can she find anything at all interesting, she will readily take an order, even if she finds the request uncomfortable. She can also be pretty literal-minded.
When it comes to a task, Giffany is highly persistent, and will carry on even after the worst beatings. While it seems remarkable, Samus believes that she is simply too naïve or too dense to realize it when her body is exhausted or in pain.
== History ==
Giffany was programmed in Yokohama, Japan in the late 90's, at No Life Games' studio. Somehow, she gained human-level sentience, and first "woke up" on May 9th, 1996. Since this was the day she gained consciousness of her own for the first time, the date is generally accepted as her birthday. 
Unfortunately, her programmers were not looking for human-level sentience in a simple dating simulator, and Giffany was to be deleted. Not wanting to give up her newfound life so easily, she struck back in a heartbeat.
(To be continued)