Randall Boggs is a chameleon-like monster and a rival to the film's main character, James P. "Sulley" Sullivan.

In the film, he works as a scarer at Monsters, Inc., a company that generates energy by scaring human children. Determined to become the company's top scarer, Randal Boggs resorts to unethical methods to achieve his goal. He is willing to go to great lengths, including kidnapping children, to extract their screams and enhance his performance.

Plus, Randall is shown to be cunning, devious, and highly skilled at blending into his surroundings due to his ability to change colors like a chameleon. His ultimate objective is to outperform Sulley, who is highly regarded as the top scarer at Monsters, Inc. at the time.

Movie: Monster, Inc.
Release: 2001

Sid Phillips is a mischievous and somewhat troubled 11-year-old skateboarder with a rebellious attitude. He wears metal braces and takes pleasure in tormenting his younger sister, Hannah, by confiscating her toys and subjecting them to unsettling experiments.

He enjoys swapping their heads or conducting "surgical" procedures on them. Plus, Sid has a penchant for destroying toys through various means such as explosions, burning, or enacting "mad doctor" scenarios.

While Sid Phillips is not a true villain - since he was unaware of the toys' consciousness when he mistreated them - the perspective of the film, being from the toys' point of view, positions him as an antagonist. Not to mention, his disturbing tendencies towards mutilating and destroying toys bear resemblance to the actions of a budding sociopath who inflicts harm on animals.

It was only after Woody and the other toys frightened Sid to the point of terror that he vowed to never abuse toys again, developing a clear fear of them - which his sister Hannah took advantage of.

Movie: Toy Story

Release: 1995

Ernesto de la Cruz takes center stage as the primary antagonist in the 2017 Pixar animated film, "Coco." He was renowned as a charismatic and handsome singer and musician, evoking immense pride among the Mexican populace.

Following his untimely demise, his spirit finds itself residing in the enchanting Land of the Dead. Here, Miguel, the film's protagonist, embarks on a quest to meet Ernesto in person - as he believes Ernesto is long-lost great-great-grandfather.

However, Miguel's journey takes an unexpected turn as he uncovers a truth far different from his initial expectations. The revelation unveils Ernesto de la Cruz as the former best friend and music partner of Héctor - Miguel's true great-great-grandfather. Ernesto had betrayed their friendship by committing an unforgivable act: he murdered Héctor in order to claim his music as his own, ultimately turning himself into a celebrated musician.

Movie:Coco

Release: 2017

At first, Henry J. Waternoose III comes across as calm and fatherly, maintaining a positive relationship with the protagonists Sulley and Mike in "Monster, Inc." His demeanor is friendly and lively, particularly when he becomes excited.

However, the looming energy crisis pushes Henry J. Waternoose III to resort to villainous acts, as he becomes increasingly ruthless and forsakes his moral compass. His singular focus is to keep the Monsters, Inc.'s operation going on at any cost, without considering alternative energy sources.

Still, it is clear that his transformation into a villain is primarily driven by desperation rather than personal animosity towards Sulley - and that sets him apart from Randall, another villain in Monster, Inc. So despite his questionable actions, there remains a glimmer of potential redemption for him.

Movie: Monster, Inc.

Release: 2001

Hopper is one of the most popular Pixar villains in Disney/Pixar's 1998 flick, "A Bug's Life." This grasshopper is not one to mess with, especially when it comes to Flik, his arch-nemesis.

Hopper is ruthless, violent, and has no qualms about squashing ants like they're nothing. He even roughs up his own gang members - and might have knocked off three of them - just to keep his grip on power. Fear is Hopper's go-to tool for keeping everyone in line, whether it's his gang or the ants. He's not big on showing mercy or compassion, seeing them as signs of weakness.

Still, there's a small twist: when Flik accidentally screws up and dumps all the food into a puddle, Hopper surprises the audiences by actually giving the ants a second shot at providing grub for him and his gang. It seems he has got a smidge of compassion and mercy after all - but only when it suits him.

Movie: A Bug's Life

Release: 1998

Wrapping up our list of the most popular Pixar villains is Evelyn Deavor, the main villain in the 2018 Disney-Pixar film, "Incredibles 2." She's the mastermind behind Winston's company and happens to be his sister and business partner. And she has got a sidekick, too - the Screenslaver, a puppet she uses in her evil plan to keep the Supers illegal forever.

At first glance, Evelyn seems all nice and sweet, like she's loyal, caring, and ready to lend a hand. But that's all a front; underneath that façade is a vengeful, scheming, and downright hateful woman. She's got a grudge that fuels her, and she's determined to rid the world of anything "super," seeing them as weaklings who can't save themselves from other threats.

Evelyn Deavor is also cold-hearted and ruthless and won't hesitate to do whatever it takes to achieve her twisted goals. And she has a mean streak too: when Elastigirl collapsed from lack of oxygen, Evelyn didn't bat an eye - she might have even found it amusing. Talk about cruelty and sadism!

Movie: Incredibles 2

Release: 2018