Gigi, A.K.A. Experiment 007 and Yapper, is an illegal genetic experiment created by Jumba Jookiba. She is designed to sit, lie down, fetch, and annoy Jumba's neighbors with her constant yapping. Her one true place is with Mertle as her pet. Gigi's vocal noises are provided by Frank Welker, while Tress MacNeille does her speaking voice.
She behaves like a typical "good dog": does tricks, licks her owner's face, fetches the morning paper, etc. Because of her appearance and behavior, 007 was adopted by Mertle and wasn't recognized as an experiment until Jumba saw her. Her episode is named "Yapper" after the nickname Lilo gave her, but she is officially "Gigi" on the experiment name list in Leroy & Stitch. In Leroy & Stitch, it is revealed that she can speak English very well. At the end of the movie, Mertle joins Lilo and Stitch's ʻohana because Gigi wants to be in it with the rest of Jumba's experiments.
While Gigi fulfilled the purpose she was programmed for, which in her case was to annoy people with her constant barking, this is not a defining feature of herself. Most of the time, she is well-behaved and appears to look and act like a normal dog: barking, fetching, and listening to orders. She can be distinguished from a real dog by her ability to talk. She is affectionate to those she likes, licking Mertle's face and complimenting Clip on eating a Leroy clone's fur off. She is also loyal and brave, pushing Mertle out of the way of a plasma blast. She holds the ideal of family and ʻohana very close, having convinced Mertle to join Lilo's ʻohana because she wanted to be in it as well, and seems to get along well with her cousins.
Gigi is a white Shih Tzu-like experiment with a purple bow, black eyes and a little nose.
Gigi has an annoying bark and the typical abilities of a dog, such as sitting, fetching and licking her owner's face. She can also speak fluent English very well.
Gigi is mostly defenseless.
- Gigi was first revealed in a DVD bonus feature of Stitch! The Movie in the experiment gallery.
- Gigi is one of the ten known experiments named by someone other than Lilo, the other nine being Elastico, Yaarp, Hammerface, Heat, Thresher, Plasmoid, Morpholomew, Shrink, and Leroy.
- Her episode is named "Yapper" after the nickname Lilo gave her, but she is officially "Gigi" on the experiment name list in Leroy & Stitch.
- Gigi's pod color is white.
- Gigi is described by the experiment computer screen as, "Experiment 007. Primary function: Annoying with barking forces".
- Her number is a reference to the secret agent number of the legendary James Bond, although this is just a mere coincidence, as Gigi shares no real similarities with James Bond.
- Gigi never spoke in Lilo & Stitch: The Series. However, during the climax of Leroy & Stitch, it is revealed that she can speak English very well and says to Clip, "Nice one, cousin." She then says to Mertle, "Look out!" and pushes her out of the way of a Leroy clone's plasma blast.