Aku. He only takes pleasure in conquest, others' suffering and praises to himself. He rules the entire Earth, yet many of his decisions are not productive in any way, being done purely For the Evulz.
The Dominator from Season 5. While the High Priestess is Neutral Evil, The Dominator is a twisted psychopath who is as chaotically evil as Aku. He massacres a city of innocent civilians, robs its children and uses them as experiments. Much like Aku, his decisions are not productive in any way, being done purely For the Evulz.
The Lich is a supernatural undead force created from nuclear transmissions whose sole goal is the end of all life. It doesn't get more chaotic evil than that.
The character known only as the "Magic Man" uses his magic powers almost exclusively to harass people for his own amusement. He was exiled from his home planet for such crimes as turning all of the water on the planet into hair, fusing people's bodies together and making people's shadows come to life and attack them. He also uses his powers to set up Hard Truth Aesops; in his first appearance on the show, when Finn gives him some food thinking him to be a beggar, he turns Finn into a giant disembodied foot so Finn can "learn to appreciate what a jerk I am." He becomes more of a True Neutral after the events of "You Forgot Your Floaties" (Or possibly even Lawful Good after the events of "Normal Man").
Hunson Abadeer is a demon who attacks people without provocation and also rules over a hell-like dimension called the Nightosphere which is "sustained by chaos" When Marceline is tricked into temporarily taking over his position we see that part of the duties of the ruler of the Nightosphere involve arbitrarily bestowing either "pleasure, pain, or weird punishment" on anybody who comes to him with an issue. He even describes himself as "filled with chaotic evil" in "Daddy's Little Monster".
Golb is a being of pure chaos and disharmony. It may not even be aware of its surroundings, but its very existence mutates and corrupts lifeforms into horrifying monsters. In fact, the only way to mitigate its effects is to sing in harmony.
Girkek: My only remorse is that I can't destroy your planets again!
Evil Coop in the finale: a Blood Knight of the first order who, having reduced his own dimension to a burned-out wasteland, seeks to invade Coop's own in order to devastate that one too.
Trigon of Teen Titans, a demon lord who destroyed the world just to watch it burn (he does rule over lesser demons, but this seems to amount to making them grovel and fight for his entertainment). His daughter Raven could also be said to be Chaotic Evil by nature, but she's Lawful Goodby nurture, and struggles with herself continually over this.
Brother Blood started out Lawful Evil, but suddenly devolved into this once he created a giant tidal wave to destroy a city just because.
Rampage in Beast Wars is an Ax-Crazy murderer who killed a colony For the Evulz and won't willingly work with anyone, only siding with Megatron because the Predacon cut out half of his Spark and uses it to torture the insane monster into submission.
Galvatron from Transformers. He is essentially Megatron's evil spiced with the added flavor of damaged sanity chips caused by a crash-landing and a prolonged plasma bath after the events of The Transformers: The Movie. He's prone to shooting his own troops just for the heck of it and is as much a detriment to his own plans as the Autobots due to his psychosis. It reached the point where an episode had his loyal second-in-command sending him to a sentient Therapy Planet by force in hopes of curing him. Not only did it fail, but when the planet interfaced with him in an attempt to lobotomize him, he drove it insane with his madness before killing it and razing its entire civilization back to the stone age.
Vicky from The Fairly Oddparents, the Psycho for Hire, Straw Nihilist, and evil incarnate. It seems her only purpose in existing is to torment the children she babysits just for the sake of it. Timmy more-or-less calls her the most evil being in the Universe at one point.
Richard Nixon's Head, current President of the Earth, often seems Neutral Evil, but several of his actions seem to mostly be motivated by just proving how evil he is. In his first appearance, he promises if elected to sell children's organs to zoos for meat, apparently just because he can.
The Villain Protagonist Bender is the perfect example of a Token Evil Teammate. He enjoys his freedom above all things and will do bad things and disobey orders simply to prove he is The Unfettered. Despite being a robot and having certain lines he won't cross, he is far too greedy, wanton, hedonistic and selfish to qualify as merely Chaotic Neutral. However for a Chaotic Evil character, Bender is a rare example of Even Evil Has Standards; Bender considers Fry his best friend, and has shown considerable emotion at his loss, although he often treats him rather badly. He has even promised to never kill him, the only other exception being Hermes, after he helped Bender come to terms with being imperfect. When given the choice he will consistently side with his friends.
Fry: You mean Bender is the evil Bender? I'm shocked. Shocked! Well, not that shocked.
Gravity Falls has Bill Cipher, who treats the end of the world (which HE brought on after millennia of orchestration) like a college party, and tortures people and animals For the Evulz. He's very much a Type 4.
Psycho for HireZim from Invader Zim. He would be Lawful Evil (or at least Neutral Evil) if he didn't prove to be Ax-Crazy from time to time, and at one point horribly crippled Dib with a temporal replacement device and GIR's rubber pigs just out of personal spite. Depending on the plot, Zim is either Chaotic Evil, Neutral Evil or Lawful Evil — there's a thin line between stupid and incompetent lawful evil, genuine chaotic evil, and regular neutral evil.
Hexadecimal of ReBoot places more value on chaotic than evil. She once reversed her own Medusa Bug when its end result was a boring, motionless world. She shifts to Chaotic Neutral when Bob fixes her face.
Big Bad Demona from Gargoyles. None of her evil plans actually benefit her or improve her life in any way: they are entirely focused on the extermination of the people she hates.
The Witch's Ghost/Sarah Ravencroft from Scooby-Doo! and the Witch's Ghost wanted to destroy the world, and, as an actual supernatural ghost, was one of the only ones who had the ability to do so. Her Neutral Evil descendant Ben Ravencroft wanted to summon her so they could take over the world together, but she wanted to destroy it instead.
Twin Masters, the baddies from the second season of Hero: 108, seek nothing more than to let chaos reign supreme, and wipe out every living thing in Hidden Kingdom.
The lineup of Dethklok in Metalocalypse are card-carrying evil, and insanely chaotic.
Master Shake from Aqua Teen Hunger Force consistently exhibits erratic, destructive, and often violent behavior. His turnoffs are friendship, manners, and people.
Nightmare Moon's goal is to bring about The Night That Never Ends, which would incidentally kill everyone in Equestria, regardless of identity or relevance to her personal goals. In addition, she wants to be respected and awed, and doesn't care if she has to rule by love or by fear to get that respect.
Discord is introduced as "the spirit of chaos and disharmony". He's so chaotic he's practically crazy, and wants to turn Equestria into a World of Chaos for fun (which he can do at a whim if he's not stopped), and the fact that this would make the inhabitants miserable forever probably only encourages him. He also likes to specifically torment those who could stand in his way, even though he shows he could easily get rid of them without doing it.
"The Great and Powerful" Trixie is normally just a show-off and a bully, but when she dons an Artifact of Doom to match Twilight Sparkle's ability in magic, its corrupting influence temporarily causes her to become the nutty tyrant of Ponyville, assaulting others with magic if they don't follow her weird random demands.
Trixie: Pull, you fools! Snips: But wouldn't it be faster if [the cart] had some wheels? Trixie: The Great and Powerful Trixie doesn't trust wheels. Now, pull faster!
Cozy Glow believes that friendship is powerful and decides to become the empress of friendship by teaming up with Lord Tirek to drain all magic from Equestria and trap the Elements of Harmony in Tartarus. Despite this, her definition of power doesn't seem to have a meaning and her interests seem to only focus on feeling powerful, instead of leading toward an actual direction.
SheZap from SheZow values nothing more than chaos plain and simple.
The Red Lotus from season 3 is this as well, Zaheer particularly. They are a society dedicated to wiping out world order and the Avatar. However, they're devoted first and foremost to chaos, it's only their methods that push them into evil.
"The natural order is disorder."
Zaheer seems to see himself as more Chaotic Neutral or Chaotic Good, as he uses what he sees as more extreme methods of attaining balance via disorder and chaos to get rid of the governments that he sees have corrupted the world. In season 4, his sincere dedication to chaos as an ideal comes to the front when he provides advice to The Hero Korra in order to defeat the Lawful Evil tyrant Kuvira (who came to power in the vacuum left in the wake of his own actions).
Lucius Heinous VII, whose sole goal is to make everyone else miserable For the Evulz.
Heloise is another example. Even though she works for Lucius, she's still a "more chaotic than evil" example; while she shares his goal of making Miseryville's population miserable, she also wants to make Lucius miserable, and the easiest way to do that is to make everyone around him happy.
South Park: Eric Cartman. He's an evil, sociopathic kid who often gets revenge on others in horrible ways. Examples are how he murdered his bully's parents and fed it to him while mocking him, forced another kid to saw through his leg because he called him chubby, and how he orchestrated the suicide of his therapist's wife because he mocked him for being fat. While he normally only goes after people for revenge, he also does things like attempted genocide and once manipulated Cthulu into doing his bidding and kill thousands of hippies and other innocent people just because he could.
Whether you see Rick Sanchez from Rick and Morty as this or Chaotic Neutral entirely depends on how willing you are to forgive him his more egregious transgressions, such as enslaving an entire planet to power his car battery, destroying a universe, or creating (at the very least, casually employing) a race of creatures whose every living moment is pain until they perform their assigned task, whereupon they welcome sweet oblivion.
Lord Dominator from Wander over Yonder definitely counts due to her determination to destroy the galaxy.
The Giant Chicken from Family Guy is definitely this. Serving as nothing more than a recurring antagonist, attacking Peter in ridiculously prolonged fight sequences that hardly make any sense within an episode's story. No matter how much damage he suffers, this oversized avian NEVER stays down.
Yellow Diamond, one of the four leaders of Homeworld in Steven Universe, falls into this category. Despite nominally being concerned with the fate of her empire, she cares more about retribution and destruction than what would make the most strategic sense. She disregards the much-needed natural resources of the Earth and insists on destroying it out of spite, and wants to shatter every Rose Quartz gem for the alleged actions of one. The contrast with her Lawful Evil "sister" Blue Diamond is best seen in "The Trial", in which Blue insists on following legal procedure to the letter, whereas Yellow just wants to skip straight to execution and even poofs both lawyers in a moment of Tranquil Fury.
Vlad Tepes Dracula in Castlevania (2017) is an sympathetic example and an interesting examination of this trope. He is waging a literal genocidal campaign against mankind for his wife's unjust murder and has assembled every monster, vampire from around the world and the legions of Hell itself to massacre every human in his path. However, his war is noted by the lack of any tactic or strategy beyond just kill everyone, and Dracula's own minions note that he is too consumed with grief and despair to come up with anything close to it and that he is just lashing out aimlessly.
Catra from She-Ra and the Princesses of Power is another sympathetic character, and at the beginning her lack of concern for the strict rules of the Evil Hoard and affection for her best friend Adora make her seem Chaotic Good. It's once Adora rebels against the Hoard that her true colors are shown, as Catra is totally unable to comprehend that Adora rebelled because of the atrocities the Hoard were committing, and actually bemused as to why the suffering of others matters so much to her. As far as Catra's concerned you do whatever it takes to look after yourself and those you love, and she has absolutely no regard for anyone else. This betrayal by the only person she cared about drives her to become more and more committed to the Hoard's cause in order to reclaim that sense of validation and support, and by the end of the season she's firmly Neutral Evil.
The later seasons move her even further into Chaotic Evil territory. Adora's continued victories and her own continued failures take a serious toll on her mental state, to the point where she becomes desperate to defeat Adora in something, even if it means destroying the entire world. By the end of the third season, her motivation is pretty much only "get back at Adora, no matter the cost".
Invictus from Final Space poisoned the Titans and orchestrated a rebellion which led to its imprisonment in Final Space. The whole reason as to why it wants to be freed from its prison is so it could consume all life in every dimension to start things anew. In the season 3 finale, Ash releases him much to the horror of Team Squad.
Neutral Evil, The Dominator is a twisted psychopath who is as chaotically evil as Aku. He massacres a city of innocent civilians, robs its children and uses them as experiments. Much like Aku, his decisions are not productive in any way, being done purely For the Evulz.