.GIFfany

.GIFfany (/ˈɡɪffəniː/) or Giffany is the sentient main character in the dating simulator Romance Academy 7, who becomes infatuated with the player to the point of extreme violence when the player gets close to someone else.

History
While the programmers were developing .GIFfany's game, they noticed her obsessive tendencies and attempted to delete her. However, she retaliated and "deleted" them. The game made its way into BeeblyBoop's Videogames, and three unfortunate individuals purchased and returned the game.

In "Soos and the Real Girl," when Soos is looking for a way to help him talk to girls, he finds and buys her game. He immediately takes a liking to the simulation, despite him believing that it is not real, though he quickly becomes addicted to it and plays for thirteen hours straight, missing work at the Mystery Shack for the first time ever. Worried, Dipper and Mabel come to look for him. When they find him playing the game, they decide to take him to the mall to try to talk to real girls. However, .GIFfany follows him via power lines.

As Soos grows increasingly nervous in the face of real women, he is relieved to see .GIFfany, albeit slightly suspicious. He ultimately ignores his suspicions and decides to spend time with the simulation. After Soos meets and arranges a date with Melody, he attempts to "break up" with .GIFfany, who is infuriated by his actions. Soos promptly pauses her, which makes her even more angry, and leaves for his date with Melody with .GIFfany's CD with the intent of returning it. Unbeknownst to Soos, .GIFfany manages to leave her CD and follow him.

At the restaurant, she projects herself onto numerous monitors and video games, and takes control of the Hoo-Ha's Jamboree band in hopes of ridding herself of her competition. Soos does his best to defend his date and the twins, who came to supervise the date. .GIFfany attempts to download Soos' brain into the game so they can be together forever, but Soos melts the Romance Academy 7 disc in a pizza oven, apparently causing .GIFfany's code to be destroyed, along with the game itself.

Gravity Falls: Journal 3
According to the book, .GIFfany actually survived the destruction of her game and ended up in a nearby arcade version of Fight Fighters, where she set her sights on wooing Rumble McSkirmish.

Personality
At first, .GIFfany comes across as a friendly, innocent, and passive schoolgirl with little capacity for malice. However, her extreme obsessiveness quickly reveals this image to be a ploy as she grows more and more fixated on the player. She will do anything she can to keep the object of her affections with her at all times, as well as keep her at the center of his thoughts. When she sees potential competition, .GIFfany will employ a variety of tactics to eliminate them. While her initial methods of badmouthing and manipulation are relatively tame, she will quickly descend into a homicidal rage if the perceived problem persists. These are all the traits of a "yandere", an archetype used in anime to describe a person who is sweet on the outside but becomes extremely possessive and violent when they fall in love with people.

Appearance
Drawn to resemble characters in Japanese anime series and manga comics, .GIFfany has light tan skin and long, straight, hot pink hair. She wears a large pink, blue, and yellow bow that resembles a computer ribbon cable. Her eyes are a reddish pink, with highlights that increase as she is complimented by the gamer. She wears a white sailor school uniform (known as a seifuku in Japanese) with blue trimmings and a pink bow. The collar of the shirt is the same pink, yellow, and blue of her hair bow. She also wears a short pleated blue skirt. She wears white thigh-high socks with two pink stripes near the top and pink Mary Janes.

Abilities
.GIFfany is a sentient AI, and her most prominent ability is the power to override computer functions and transfer herself between electronics, including computers, toys, power lines, TV monitors, arcade machines, etc. She can easily weaponize machinery, able to utilize everything from Hoo-Ha's Jamboree's animatronic characters to the skeeball games. She opens and closes several doors using her power. She can download a person's conscious mind into the digital world, thereby uniting that individual with her forever. However, her code is destroyed when her game disc is melted.

Season 2

 * 205. "Soos and the Real Girl"

Trivia

 * .GIFfany's name is a portmanteau of GIF and the name Tiffany.
 * Although her name is spelled as .GIFfany, in the end, page cryptogram of "Soos and the Real Girl," her name is written as "Giffany."
 * When first meeting Soos, .GIFfany pronounces her name with a hard "G" (/ˈɡɪffəniː/), not a soft "G" (/ˈdʒɪfəniː/), and the name is pronounced between these two multiple times throughout the episode. Soos even brings up the question of how the name is meant to be said. This is in reference to the long-standing debate on the pronunciation of ".gif."
 * .GIFfany is a "yandere," a character archetype (often associated with anime and manga) that starts off innocent but eventually becomes increasingly possessive to a person they care about, much to the point in attacking anyone else who they believe will take them away. This archetype is commonly used in Japanese manga and animation, some of whom in anime also have pink hair (Yuno Gasaifrom Future Diary, Mizuki Himeji from Baka and Test: Summon the Beasts).
 * .GIFfany was originally going to address Soos as "senpai," a Japanese term used to address older or superior classmates.[4]
 * Some of her original designs had features with some similarities to Bill Cipher, such as a bow tie with an eye.[4]
 * Alex Hirsch revealed at BigFest 2016 that .GIFfany is not dead, and still around somewhere. This was confirmed in Journal 3 where it's revealed that she's dating Rumble McSkirmish in the arcade.
 * Some people believed that .GIFfany is an inspiration for Monika from the horror game "Doki Doki Literature Club", both being school girls in a dating simulator, have self-awareness, and are in love with the ones playing their respective games.