Complete Monster/Sailor Moon

""The time has come to instill hatred and greed into all living creatures in the universe. Queen Beryl, eliminate all beings who attempt to resist, and turn the world into complete darkness!" - Queen Metalia, right before infusing her spirit into Queen Beryl's body." While a very lighthearted Magical Girl anime, even the pretty guardian Sailor Moon is not safe from facing her share of these especially evil baddies.

Sailor Moon

 * Queen Metalia, the first Sailor Moon Big Bad is an Eldritch Abomination who was the one who destroyed the Moon Kingdom and killed Princess Serenity, Prince Endymion, and the Sailor Senshi in the first place. Her goal for existing? She's a nihilistic demon who hated all life and wanted to see it eradicated. When you're the source of so much evil and pain due to nothing but pure, irrational hatred for pretty much everything, you know you've crossed into Complete Monster territory.
 * The original manga and it's anime adaptation, Sailor Moon Crystal, gives Metalia a more in-depth portrayal. She started her campaign of evil by corrupting a young sorceress named Beryl, who agreed to work for Metalia to destroy the Moon Kingdom on the premise that she would be able to make Prince Endymion love her. With Metalia's influence, she was even able to corrupt the Shitennou, Endymion's guardians, and launched an attack on the moon. Although she succeeded in destroying the Moon Kingdom, Queen Serenity was able to use the Silver Crystal to seal away the Dark Kingdom to prevent them from causing any further harm. Sadly, this was not the end of Metalia, and by the 20th century, she reawakened, though still imprisoned, and corrupted the reincarnation of Beryl to once again serve her and to find the Silver Crystal in order to free her. The Shitennou were also reborn and corrupted to serve her as well. After Prince Endymion's reincarnation, Mamoru Chiba, was captured, Metalia possessed his body, forcing Sailor Moon, the reincarnation of Princess Serenity, to kill er beloved, and left Queen Beryl to die by the hands of Sailor Venus when she outlived her usefulness. Thankfully she was finally destroyed by Sailor Moon and the Silver Crystal via Moon Healing Escalation attack, ending her reign of terror for good.

Sailor Moon R

 * Wiseman/Death Phantom, the Big Bad and Eldritch Abomination of the R season of Sailor Moon, is definitely this. He corrupted and manipulated the rebellious Black Moon Clan of Nemesis into becoming villains and used them to turn the peaceful, Utopian Earth of the future into a barren, desolate wasteland, had the dark crystal created so that he could do the same to the Earth of the past, Mind Raped a vulnerable little girl into becoming his servant and tried to have her kill her future parents and friends, turned one of his pawns into a monster and knowingly sent her to her death, sadistically blasted to death another minion in front of that minion's older brother for having outlived his usefulness and attempting to screw up his master plan, killed the older brother in a brutal attack meant for Sailor Moon, tried to strangle Sailor Moon shortly afterwards before attempting to break her spirit through lies and Mind Rape, and planned on destroying the universe for the sheer hell of it. Quite easily the vilest villain in the entire series.
 * And in the manga, Wiseman was a mass-murderer before being possessed/merging with Death Phantom. Oh, and guess who is shown being the one to start Sailor Galaxia on the path of being manipulated by Chaos in the final arc? Make no mistake, all (manga) or nearly all (anime) Big Bads in Sailor Moon are Omnicidal Eldritch Abominations, but Wiseman just puts a personal touch on the whole business of causing The End of the World as We Know It.
 * Crimson Rubeus, high-class member of the Black Moon clan, was REAL bad as well in the anime. His treatment of his underlings is completely unforgivable (especially what he does to Cooan and Petz, by ). In addition to being the epitome of a Bastard Boyfriend, he's one who definitely Would Hurt a Child, attempting to manhandle or attack Chibi Usa during every encounter with her, and has no qualms with murder or torture to get his way, even crucifying the four Sailor Senshi and intending to brutally kill Sailor Moon while they're Forced to Watch. Out of all the Black Moon clan, his interactions with the abovementioned Wiseman feel the most like two people talking on an equal level, rather than Wiseman being advising, manipulative, or antagonistic like he is with everyone else. And he's also very irritatingly smug and self-absorbed.
 * He was a piece of work in the manga as well, sending the Four Sisters on much more destructive evil missions than they went on in the anime and taking sadistic pleasure in capturing the Sailor Senshi in front of Usagi's eyes. Unlike in the anime, the Four Sisters probably also qualify for Complete Monster status in the manga, especially Cooan, who burns an innocent girl to death with no remorse.

Sailor Moon S

 * The manga version of Shuichi Tomoe was supposedly a loving father once (or at least Hotaru thinks so), despite being a Mad Scientist even then, but he completely snapped after the accident in his lab that crippled Hotaru (her manga self is a heavily scarred cyborg, thanks to it) and killed her mother, willingly joining Death Busters and implanting the egg of Mistress 9 into Hotaru's body without any sort of second thought. He also had a massive A God Am I complex and wished to create a new race of superbeings, starting with himself so that he could be ruler of the new world. After his death, Hotaru even acknowledges how far gone he was, stating that her father truly died a long time ago. Thank God he was much more toned down in the anime, where he was mostly a Brainwashed and Crazy father who made a Deal with the Devil to save Hotaru after the freak accident - not knowing that they'd be rendered insane in different ways.
 * Let's not leave the manga version of Pharaoh 90 off the hook though. In the manga, Pharaoh 90 first orders Kaorinite to collect souls from the people of earth to sacrifice to him, and use their bodies as hosts for his Diamons. He's also the one behind Shuichi Tomoe, meaning that all of the aforementioned atrocities, including the implanting of Mistress 9 into Hotaru's body is partially his fault. And when he's released from the Tau Nebula and merged with Mistress 9 after Hotaru broke free from her control, he then attempts to destroy earth with the sole intention of remaking it into a second home for him and his Diamons. Thankfully, he gets what's coming to him when Hotaru awoke as Sailor Saturn, mortally damaging Pharaoh 90, and sent him back to the Tau Nebula to die, with Sailor Pluto closing the portal to the Tao Nebula forever. Like Tomoe, he too was toned down for the Anime, which reduced him to nothing more than a shapeless, voiceless Generic Doomsday Villain.

Sailor Moon Super S

 * Unlike in the anime, where the character is revealed to be a Woobie, Destroyer of Worlds, Queen Nehelenia in the original manga is presented as nothing more than a selfish, homicidal tyrant who believed herself to be the rightful ruler of the Moon Kingdom. She introduced herself by crashing Queen Serenity's birthday celebration in an attempt to usurp her throne. During the ensuing confrontation, Nehelenia was sealed within the Dark Mirror by Serenity herself, but not before she cast one final spiteful curse on the Moon Kingdom, which would result in it's destruction long before the princess could even inherit the throne. This eventually came to be as a result of Queen Metalia's actions, meaning that Nehelenia was indirectly responsible for Metalia's crimes. And however long she spent within the dark mirror still wasn't enough for her to repent, as she's at it again when she came into contact with Chibi Usa's future guardians, the Sailor Quartet, and transformed them into the Amazon Quartet to aid in her wicked goals. She then orchestrated the attack on the realm of Elysion in an attempt to capture the high priest Helios, while also sending out the Amazon Quartet to wreak havoc in their search for the legendary Silver Crystal, with the intent to use it's power to conquer the entire galaxy. During the final battle, she tried to forcefully take the Silver Crystal one last time, only to be repelled by it's power combined with that of the newly awakened Golden Crystal, bound together by Sailor Moon and Tuxedo Mask's love for one another. Nehelenia is then defeated by Eternal Sailor Moon, using the combine power of the entire Sailor Senshi, causing her to shrivel into an ugly old hag that reflects her true self, before vanishing inside the Dark Mirror once more, never to be seen again.

Sailor Stars

 * Chaos is evil incarnate and the manifestation- and cause - of all of sadness, cruelty, and evilness in the galaxy. It revealed in theStars arc of the manga that Chaos is responsible for all of the suffering in the galaxy and all of the Big Bads Sailor Moon has faced (Queen Metalia, Death Phantom, Pharaoh 90, and Queen Nehelenia) are all incarnations of Chaos. While Chaos itself might lack the moral agency needed to qualify for the trope, all of its spawns in the manga definitely do since they live solely to spread misery throughout the galaxy.