Kixx

Kixx, A.K.A. Experiment 601, is an illegal genetic experiment created by Jumba Jookiba. He is designed to use his superhuman strength and kickboxing skills to bully others. His one true place is teaching people kickboxing and hosting his own workout video entitled "Kickboxing with Kixx." He is voiced by Frank Welker.

Personality
Kixx is shown to be a talented kickboxer. He loves to pick fights, which could make him be considered a bully. He also appears to be exceedingly dim-witted, but slightly hotheaded. However, after Lilo and Stitch befriended him, Kixx has shown to control his temper a lot better.

He is not the brightest, but he's the most loyal. He is an excellent fighter, but really a big softie. He enjoys sparring, sports and soft music. He is valiant and has a small code of chivalry he follows. Kixx is very slow-witted and foolish, but also very ill-tempered, extremely aggressive, and excessively violent.

Lilo & Stitch: The Series
Experiment 601 was the 601st experiment to be created by Jumba with Hämsterviel's funding. He was designed to use his kickboxing skills to beat up any and all opponents.

601 and the other first 624 experiments were deactivated and smuggled to Earth by Jumba during his mission to capture Experiment 626.

All of the experiment pods were released and scattered across the island of Kauai, with 601's pod landing by a cliff face.

When a passing tourist threw a half-full water bottle over the cliff, it landed by a dirt mound and trickled out water, which touched 601's pod, activating the experiment. 601 then attacked a couple, beating them up when the husband angered him.

601 then proceeded to attack and beat up anyone who challenged him or stood in his path.

When Lilo and Stitch arrived to find and capture 601, the latter ambushed them. Stitch prepared to fight 601, but faltered due to an earlier snack combo incident in which Stitch's combat training was erased. Lilo was then forced to retreat with Stitch, while 601 was distracted with beating up the newly-arrived Gantu.

While 601 went on his rampage, Lilo used a special book that Jumba lent her to re-train Stitch and teach him how to fight in combat. Even Lilo's friend Keoni gave her a few pointers, and taught her how to skateboard better.

Later, 601 attacked a beach gym, defeating all the boxers with ease, until Stitch arrived for a rematch and had a long, drawn-out battle with 601. At first, 601 was able to easily overpower Stitch, but with Lilo's tutelage and Stitch's coordination, the latter easily defeated 601.

601, christened Kixx, was shortly after found a one true place teaching people kickboxing, while a commercial of Kixx hosting his own instructional workout video was watched by Experiment 625 and an injured Gantu.

Kixx reappeared in "Elastico" as one of the audience for Lilo's hula dance.

In "The Asteroid", Kixx was one of the six experiments whom Stitch convinced to come with him and Lilo to save Earth from an approaching asteroid. During the journey, Kixx kicked the back of Spooky's seat, causing the latter to terrify him. Also, when Pleakley hit Kixx for grabbing at the free soda and peanuts, the latter beat Pleakley up and took a bag of peanuts for himself. He later helped Stitch remove the ship's hyperdrive engine.

In "Angel", Kixx was one of the experiments whom Angel reverted to evil using her song. As a result, Kixx began beating up tourists for Angel, forcing Stitch to fight and defeat him. Later, Kixx and the other malevolent experiments attacked Stitch aboard a ship, but Angel turned them back to good before Kixx could land the fatal blow. Working together, the experiments were then able to successfully escape the ship.

Kixx reappeared in "Slugger" as part of Lilo's softball team.

In "Shoe", Kixx was one of the experiments who helped turn Jumba and Pleakley's ship into a hotel.

Kixx was one of the experiments in "Checkers" who joined Stitch in a rebellion against Gantu.

In "Ploot", Kixx was one of the first team of experiments (along with Deforestator and Richter) formed to try and stop Ploot. However, Ploot was easily able to defeat them, forcing the three experiments to retreat.

Kixx was seen on a computer screen in "Ace", posing as an evil creation of Jumba's to fool the head of E.G.O.

Leroy & Stitch
The first 624 experiments, including Kixx, were rounded up by Leroy and taken to a stadium to be destroyed. However, Lilo, Stitch, Jumba, Pleakley, Reuben and Gantu arrived before the experiments could be destroyed.

Kixx participated in the following battle between the experiments and the Leroy clones by beating up attacking Leroys.

However, the Leroys soon gained the upper hand in the battle, but were defeated when Lilo, Stitch, Reuben and several other experiments performed the song "Aloha `Oe," which caused the Leroy army to shut down due to the original Leroy's fail-safe. Kixx joins them for the song by playing the bongos.

Stitch! anime
Kixx made an appearance in the Stitch! anime along with Pix, Boomer, Slushy, Blowhard, and Slugger when Yuna and Stitch visited Tokyo Disneyland. He makes a second appearance where Hämsterviel modifies him with a new samurai style of fighting, along with a samurai outfit to match it.

Trivia

 * Kixx's appearance and mannerisms greatly resemble the Tasmanian Devil from Looney Tunes.
 * He is also referred to and mistaken as a purple pig with four arms.
 * Kixx is named after the soccer team, Philadelphia Kixx.
 * Kixx's pod color is blue.
 * Kixx is described by the experiment computer screen as, "Experiment 601 Primary function: Hand-to-hand combat."
 * Kixx bears some resemblance to Machamp from Pokemon, even being muscular, having four arms and highly skilled in physical combat.