Leroy, A.K.A. Experiment 629, is an illegal genetic experiment created by Jumba Jookiba, and the titular secondary antagonist of Disney's 2006 film Leroy & Stitch, the main villain being Hämsterviel. He is Stitch's twin brother and evil counterpart. He is designed to possess all of Stitch's powers, but also has the ability to disguise himself as Stitch by changing his fur color from red to blue and instantly regrow his fur. He is Hämsterviel's new henchman and own version of Stitch, and has an army of clones. His one true place is in prison. He is voiced by Chris Sanders.
Leroy is an antagonistic, intelligent, conceited, rude, small-minded and shapeshifting experiment who is Hämsterviel's henchman and Stitch's archenemy and evil twin. Despite his loyalty to Hämsterviel, Leroy enjoys seeing him suffer, as he is shown laughing at Hämsterviel when the latter falls to the ground after their cannon is destroyed.
Like Stitch, Leroy is shown to be very destructive, but in a more vicious than mischievous way. He is also shown to be a physical, sadistic, cruel and disgusting slob. Despite this, he also possesses some of Stitch's habits, including holding soda cans in his mouth, picking his nose with his tongue, and sharing Stitch's love for Elvis Presley's music, as Leroy and his clones were dancing to "Jailhouse Rock" in their prison cells.
Leroy is cunning and quite mischievous like Stitch, though he isn't quite as immature despite the "age" difference. Where the similarities end in Leroy is how brutal he is in comparison to Stitch. Leroy isn't above using violence to get things accomplished and enjoys tormenting his foes whenever possible. He will more often than not rely on brute force in battle and tends to not show mercy to his opponents. While he does rely on brute force, Leroy is capable of planning out his attacks and is quite smart. While his English isn't perfect, Leroy can speak it a bit better than most other experiments.
Leroy resembles an exact duplicate of Stitch with rougher red fur, a mahogany nose, black claws, toes, tips of antennae and ears and back markings, a light tan/pinkish-orange stomach from his chin down and around his eyes, crimson markings on the back of his head and on his back, frilly ears with light purple inside, yellow teeth, a fluffy tail, and a slightly deeper voice as well as two extra, retractable arms, two bent retractable antennae on his head, three bent retractable spines tipped with white and a very dark mahogany on his back, and retractable claws on his front and back paws. When his mouth is closed, his canine fangs stick out. (Note: Leroy can be considered as Experiment 629, as he was the 629th experiment created.)
Non-canon: He wears a dark blue spacesuit with a triangle consisting of a deep blue border and green center on his chest and each of his sleeves and patches consisting of a deep blue border and dark blue center on each of his legs, black belt with a deep blue square buckle, both black collar, cuffs, and anklets.
Leroy is also very physical, but also with plasma gun. He also dresses in a black uniform. Leroy's number was never mentioned in the movie, (Jumba tries to call him "627" as mentioned on the Disney website, but Gantu reminds him that he has already made Experiment 627) so he is known as "Experiment 629", but he is called "628" in some commercials.
Leroy was the last of Jumba's experiments to be built. While spending a few years on Earth, he had an unfinished experiment at his laboratory in deep space. After Lilo and Stitch had successfully captured all 625 experiments and turned them from bad to good, Jumba regained access to his lab. During this time, Jumba's evil former partner Dr. Hämsterviel had escaped prison with Gantu's help and paid Jumba a visit. He ordered Jumba to finish the experiment as a red replica of 626 (Stitch). The orders were fulfilled and Leroy was created. Stitch then burst into the lab and battled Leroy, but Leroy defeated Stitch after the latter was distracted by Pleakley's untimely arrival. Leroy was later cloned by Hämsterviel to create an army.
Leroy disguised himself as Stitch to gain access to the BRB (Big Red Battleship). Once on board, he revealed his true form. When Lilo later tried to contact Stitch, Leroy made himself look like Stitch over the supercomputer. Lilo, however, knew it wasn't him because he didn't have the tiki necklace on him that she had given Stitch. After Leroy found out that Lilo exposed him as an impostor, he blasted the supercomputer.
While Hämsterviel and Gantu took over the Galactic Federation, one of Leroy's clones journeyed to Earth and captured all of the experiments with the exception of Gantu's lackey 625 (later known as Reuben). With their mission complete and Hämsterviel in control of the universe, the original Leroy waited on Earth as the experiments prepared to be eliminated. Before they could be, Stitch and his entire ʻohana arrived. Leroy and his clones battled Stitch and his cousins. They seemed indestructible, but Jumba had secretly programmed a fail-safe into Leroy before he was charged: Leroy and his clones would shut down when they hear the song "Aloha ʻOe". Stitch, Reuben, Lilo and a reformed Gantu performed the song, and the Leroys were defeated. They were then sent to prison alongside Hämsterviel, and before the credits, Leroy and his clones were seen happily dancing to Elvis Presley's song, "Jailhouse Rock".
Leroy possesses all of the same powers as Stitch, with a little extra boost of strength and speed, along with the ability to change his fur color to pose as Stitch and instantly regrow his fur. He can curl into a ball and roll with incredible speed, dealing heavy damage to anything he hits. He is fireproof, bulletproof, shockproof, acid-proof, explosion-proof and plasma-proof. He is also smart, faster than a supercomputer, and can absorb electric and fire powers. He is immune to Angel's forward song and stronger than Stitch and all of the other experiments. He is normally very physical, but also good with a plasma gun.
During his creation, Leroy was programmed with a fail-safe that causes him and his clones to shut down when they hear the song "Aloha ʻOe".
It is unknown whether or not Leroy shares Stitch's weakness of water.
- Leroy is Experiment 629. In promotional material for the film and on some Japanese and Disneyland Paris merchandise, Leroy was/is also referred to as Experiment 628. However, this is false as he was only called Leroy in the film and is the evil doppelganger of Experiment 626.
- It is never said or shown what Experiment 628 is.
- Leroy is one of the ten known experiments named by someone other than Lilo, the other nine being Gigi, Elastico, Yaarp, Hammerface, Heat, Thresher, Plasmoid, Morpholomew, and Shrink.
- When Dr. Hämsterviel christened the newly-created experiment Leroy, everyone laughed at the name except Lilo, who thought Leroy was a fine name.
- Leroy looks exactly like Stitch, except Leroy is red, has smooth dents in his ears, and is a bit rougher around the edges. He also has all the same powers as Stitch, with a few extra.
- Hämsterviel wanted Leroy's fur color to be red instead of blue so as to match his cape, and that he doesn't like the color blue.
- Ironically, Leroy can change his fur color to look like Stitch's.
- According to the DVD scene selection, Leroy has about 50,000 clones.
- The scene where a Leroy clone crash lands on Earth in Mertle's backyard is the same animation when Stitch first crash landed on Earth in Lilo & Stitch.
- When Leroy was defeated, his eyes glowed green as Stitch's eyes did in Lilo & Stitch 2: Stitch Has a Glitch.
- Leroy's color seems to come from Experiment 627 (Evile), and may have been based off of 627's original design and evil attitude as well.