Nixels

Nixels are the dark, uncreative, uncool enemies of the colorful, creative, cool Mixels and the primary antagonists of the Mixels franchise.

Personality
They are shown to not be very intelligent, as they are easily confused (such as when they stand at attention towards an ice sculpture of Major Nixel in Wrong Colors), and have poor speech capacities, only being able to say single words and very simple phrases.

Nixels are small and seemingly harmless; but they are actually vicious, annoying, crazy and destructive creatures who are spread all over the land of the Mixels. Their society operates more like a virus, and they live to tear down and break apart the world around them, including any combinations that the Mixels create. There is nothing the Nixels hate more than when two or three Mixels combine together and get super powers. The Nixels have made it their mission in life to put an end to such crazy creativity all together. The only way to do this is to hide and destroy the cubits that enable the Mixels to combine in the first place. When they swarm together, the Nixels can break apart a Mixel in seconds.

Episodes where the Nixels’ Plans Failed

 * Nixels (episode): Flain and Seismo created a lava slide at the Infernite Kingdom, but when they were about to ride it, a Nixel came in and tried to ruin their fun. Soon, a lot more of them invaded as well. Flain suggested that he and Seismo Mix so they could repel the little creatures away, and so they did so after retrieving back their cubit from them. After they defeated the Nixels, they upgraded their lava slide in the process; but the same Nixel from the beginning came back to annoy them again. This time, Seismo stomped on it and it got stuck on the bottom of his foot. He then left with Flain to try out their improved lava slide, while the flattened Nixel angrily chanted.
 * Another Nixel: During a training exercise to steal cubits, Major Nixel instructed three Nixels to head to various lands to take one from each of the original three tribes. The Nixel that headed to the Infernite lands ended with his head on fire, the Nixel that headed to the Cragster lands ended with a footprint embedded into his shell, and the final Nixel that made it to the Electroid lands brought back a Cragster and Electroid cubit, along with the Zaptor & Seismo Mix, who attacked the Major, much to the amusement of the Nixels.
 * Wrong Colors: A large group of Nixels managed to give chase to Shuff and Volectro, ending with them being able to drive the two Mixels off of a cliff. Thanks to the interventions of Flurr and Gobba, the two Mixels were able to survive via a makeshift bobsled, but the Nixels continued to chase them, only to be stopped by a crude ice sculpture of the Major, which scared them enough to salute, and stay saluting, while the Mixels ran off.
 * Nixel Mix Over: During another training exercise, Major Nixel painted two Nixels in Frosticon and Flexer colors in an attempt to steal more cubits. This disguise managed to fool Balk and Lunk, who were just about to play Slingshot. They unknowingly gave a cubit to the two Nixels, who faked a mix to try and blend in, but were ditched by the Balk & Lunk Mix, who just found them "weird". When they returned the cubit to the Major, he, along with the remaining Nixel army, thought they were Mixels, and attacked them, while the Major escaped with the cubit, only for the mix to retrieve it again.
 * Epic Comedy: During the annual Mix Festival, Major Nixel piloted the Cloud Ship to attack the Mixels. Using the Mega Nixel Mixel Nixer, which cost the lives of multiple Nixels, the festival was Nixed, turning most of the Mixels in to mindless zombies drained of color. When a few of the leaders were able to escape, the Major sent out the remaining Nixels to give chase. When the leaders decided that they were heading to Mixel Mountain to retrieve the giant rainbow cubit, a few Nixels overheard the plan, letting them beat the Mixels to the peak and cover the cubit. By burrowing under the cubit, the Mixels were able to smash it into smaller cubits, creating Mixes that defeated and scattered the Nixels away.
 * Mixel Moon Madness: During an Infernite camping trip, a few Nixels hid from the trio to listen in on their campfire story. When the the Mixels were abducted by the ship-space, two Nixels tagged along, getting kicked into orbit, much to their annoyance. During a picnic hosted by the Orbitons, the two Nixels burrowed under and stole the oxy-juice and crater tots being served. However, the oxy-juice was grabbed by the Nurp-Naut & Meltus Mix, who burned and stomped on the Nixel, while the crater tots were devoured by the second Nixel, who accepted rokit sauce from the Rokit & Burnard Mix, sending him into a mushroom cloud explosion from the intense heat. The two Nixels were later seen orbiting yet again. A satellite feed of the new moon-based Mixels was sent to a screening of Nixels, who jeered in anger at the new Mixels, but they all recoiled in fright due to King Nixel's arrival.
 * Mixels Rush: Nixels were a key component of the Nixelstorm, which scattered various Mixels across the lands, but also scattered the controls of the Cloud Ship as well. Eventually, the Nixelstorm was tamed by the Mixels and the Cloud Ship was fully destroyed, leading to the Nixels to creating King Nixel's Airship for the next plans.
 * The Quest For the Long Lost Mixamajig: The Nixels played an important part in King Nixel's large plan to stop the Mixels with the Mixamajig hoax. Two Nixels boarded the egg-rock to find a willing Mixel to be the one in charge of the Mixamajig key by using a Maximum Mixel shadow puppet to fool them, while also planting a seed of discord into the ranks. Eventually, when the entirety of the Mixels met at the Mixamajig threshold with their own keys, they were fully trapped and at the mercy of King Nixel. When the Mixels managed to escape through Maxing, the entirety of the Nixel army combined forces to boost King Nixel–-whose body is already made of multiple Nixels--into a larger form. To counteract, the Maxes formed the Ultra-Miximum Max and ended up defeating the King, leading his Nixel army to scatter off away from him

Revenge

 * Nixels New Adventure: One day, three Nixels visited Mixopolis and went undercover to research the Mixel tribes there. They reported the MCFD, Pyrratz and Medix as unhelpful, greedy and teeth-flossers, respectively. After the investigation, one said that the evidence proved that Nixels are awesome and Mixels are not. This angered the tribes, who then surrounded the trio.

The final battle

 * Nixel Nixel Go Away: At some point, Nixel scouts had discovered the city of Mixopolis. Led by an idea of King Nixel's, rather than destroy the city, the Nixels worked to make it their own. By using a technique called "saturation advertising", they made Mixels no longer want to mix with each other. This culminated in the creation of the I-Cubit; a device that fully drained a Mixel's will to mix, while also desaturating them. This left them open to be fully zombified by Nixel swarms. The Nindjas, after becoming aware of the plots of the Nixels, attempted to stop them, but were stopped and zombified themselves by a Nixel amalgamation. Eventually, Booger and his three friends snuck into their headquarters, freeing the Mixels from their zombification along with restoring color to the lands. A couple of Nixels ended up Mixelized as a result, while the remaining knocked out ones were disposed of by the Trashoz. King Nixel was destroyed in the process by the Tungster & Slusho Mix, while Major Nixel fled