Seiji Noumi, Arc Villain of the Dusk Taker arc. He's a member of the Acceleration Research Society, who are implied to be the main antagonists of the series, but Noumi seems to be fairly low-ranking. He does, however, prove to be a thoroughly unpleasant Smug Snake who blackmails Haru into gathering points for him and having Haru's friend Chiyu become his tag partner unaware that Chiyu is planning on betraying him and returning Haru's wings. He does have a Freudian Excuse (although since the same goes for most Burst Linkers, it doesn't say much)- Seiji's older brother bullied him, and forced him to give points to Yuichi (like Yuichi does with his victims), until Seiji unlocked his ability and brutally erased his brother from Brain Burst- but given that Seiji took sadistic pleasure in doing so, it doesn't inspire much sympathy. The closest Haru, who was bullied himself gets to sympathizing with Noumi is saying that they might have been friends if Noumi had approached him and his companions as another Burst Linker.
Araya also serves this role as leader of the Gang of Bullies who's been harassing Haru and taking his lunch money ever since he started middle school, which further amplifies Haru's self-esteem issues and slowly drives a wedge between him and his friends. When Kuroyukihime tricks Araya into punching Haru on the security cameras, and Araya finally gets caught and suspended, Araya tries to kill her and Haru in retaliation, forcing Kuroyukihime to perform a Heroic Sacrifice to save Haru that nearly kills her, as well as forcing her to give up most of her points. Araya is yet another loathsome bully, and while Taku, the actual antagonist of the first volume, has done some questionable things, he comes off as a more sympathetic character by comparison, especially after he works to make up for what he's done.
Baccano!'s first two anime arcs each have a hate worthy character, presumably due to the fact that 90% of the cast is full of criminals and thus you gotta have someone who makes the others look good by comparison, but perhaps the most noteworthy is Goose Perkins from the Grand Punk Railroad arc; he is a selfish, Smug Snake terrorist who forms a Big-Bad Ensemble with Ladd Russo (an Ax-Crazy lunatic whose main desire is to kill everyone on the train For the Evulz)...and because of and Ladd's sick sense of humor it's Goose who comes off as the most slimy and monstrous of the duo.
Baka and Test: Summon the Beasts has no clear-cut antagonistic force, save the characters' own idiocies. The Tokonatsu duo introduced as Filler Villains during the OVA serve as the necessary, obnoxious road bumps hindering the main characters' cultural festival.
Gambino is the adoptive father of Guts. Gambino repeatedly proves himself one of the most personally hateful characters in the story, between abusing Guts, putting him through Training from Hell, and even selling him to the pedophile Donovan for a cheap price. Gambino ends up killed when he drunkenly tries to murder his own son for "killing" the only woman he loves, which Guts had no control over and could not have prevented.
Donovan is a mercenary and sadistic pedophile who rapes Guts for a meager sum of three silver coins early in his life. This act traumatizes Guts for the rest of his life and nobody spares a glance when Guts kills him on the battlefield a mere day later.
Chaka from Black Lagoon. While most villains have either tragic backstories or affable traits that make them fun, Chaka is a scumbag to the core. With absolutely zero likeable traits.
Bokurano has Hatagai, especially in the manga. In the manga, he tricked Chiyu into falling in love with him, then lured her to a hotel room and had his associates gang rape her, while recording a video and using it as blackmail material to get her to do what they want, before moving on to the next victim. When Chizu gets pregnant (the only reason she doesn't kill Hatagai and herself in a Murder-Suicide), Hatagai cheerfully suggests that she get an abortion and make a birth video. He's easily the most despicable character in the series, and to make matters worse, he also goes completely unpunished in both the manga and anime.
Citrus: Many characters in the manga and anime series have their own faults, but are good persons deep inside. The same cannot be said for Mei's former fiancée Amemiya. He was a Gold Digger who was only in it for the high status it would grant him, and he has a lover that he is knowingly seeing behind Mei's back.
CLANNAD, both the Visual Novel and the Anime Adaptation, usually is in a setting where there is No Antagonist, thus it's a daily life series. Every characters seems to always have more sympathetic qualities. However, the closest they can have for this trope is the whole soccer team, a team very full of Jerk Jock, that while Youhei Sunohara was being a jerk that they kicked him out, they were no better, with implications that they did enjoy making Sunohara's time in the club miserable, and when his sister Mei begged for them to put him back to club to re-ignite his passion in life, they instead chose to torment not only Mei but also Tomoya (and in the anime, also Nagisa, who tags along) for nothing but laughs with false promises that if they put up with it, they will let Youhei back. Of course, they refused to make good of the promise, to the point that when Youhei, usually the Butt-Monkey of the whole series, struck back at them for bullying his sister. It is saying something that in the same series, there's a group of Biker Gang/Yakuza... and they have a lot more moral standards (and a sympathetic story arc) than the club.
Julio Asuka Misurugi is jealous of his sister, the protagonist Angelise, is favored over him by his parents and the people, so what does he do? Outs her as a norma, a person who cannot use mana and is shunned by society, on the day of her sixteenth birthday and baptism ritual, resulting in her being stripped of all rights and personhood and being sent to a prison colony where she is forced into becoming Cannon Fodder against dragons in hopes of having her killed off, just so he can take over as Emperor. When he learns she hasn't died yet, he has her lured out so he can publicly execute her himself, and had their father executed in the meantime. When the execution fails and she escapes, he leads a purge of the norma in order to get rid of her once and for all. When Ange finally corners him from the Vilkiss, he breaks down like a coward and tries bargaining with Ange, who is so infuriated she goes back on a deal not to kill him after he calls off the massacre, only for Embryo to off him instead. Julio is squarely on this trope that in Super Robot Wars games that included this series, he's always portrayed as a pathetic, uncharismatic leader that drove the Misurugi Empire to the ground and didn't win any favors from even other villainous forces from other series, that players couldn't help but feel Catharsis Factor whenever he met his end, however it is.
Embryo ultimately subverts what coolness he showed in his introduction as he's revealed as an Omnicidal Maniac who wants to kill everything that has no use for him and has done practically every crime in the book. He casually discards his allies and uses them as decoys and mind-rapes and tortures everyone. He is also just as racist as Julio himself as he believes the Ancient Humans should all be wiped off as he considers them a disease. He takes pleasure in trying to force Ange to love him through rape and wiped off Elektra's forces while raping her mind and body all because he didn't like the love she had for him and he doesn't care if children die. He counts as this In-Universe too as he has a 0% Approval Rating meaning no character in the show likes him and any that do end up having a HeelFace Turn after realizing how bad he is.
The Death Mage Who Doesn't Want A Fourth Time: While most antagonists have at least one reason for the way they act, no justification is ever given to Hiroto Amamiya's unnamed uncle. Supposed to look after him after his parents died, instead he abused his nephew and denied him everything but the barest necessities, saying it was for "teaching him humility" and that everything was "too luxurious for someone like him". He was also a humongous Hypocrite who indulged in luxury after receiving the life insurance of his nephew. Nobody is sorry to find out he lost all his money and ended as a hobo on the streets who died a meaningless death.
Kyosuke Higuchi. He's the only one of the Kiras to evade Draco in Leather Pants status, as he's an extremely sleazy Corrupt Corporate Executive and a Pointy-Haired Boss both literally and figuratively, and his character design is noticeably less attractive than that of his coworkers. He also threatens to rape Misa. It comes as little surprise that the audience is glad when he's the first person killed upon Light regaining his memories of the Death Note, after he reveals its existence to the police.
Demegawa is possibly the most loathed character in the show, in and out of universe. You know you're bad when the Kira Task Force basically says that you deserved to be killed by him.
Dropkick On My Devil: The titular character Jashin is deliberately made to be hated. She is arrogant, always thinking that she could take on anyone even though they'd be leagues above her; she bullies characters like Pekola for being an angel or Kori because of her being a "lowly" demon; she manipulates her best friend Medusa into providing her with money and refers to her as her "personal ATM" often; and she acts like a jerk who has no qualms with eating all of the meat meant for a hot pot party or stealing a child's toy by crudely putting it in her mouth.
Mayu's Stepfather is a child molester who loved to sexually humiliate her. Mayu's biological mother did nothing to help her daughter, not because she was oblivious or didn't believe her, but because she didn't care. She just saw her own daughter as a sexual competitor for her new husband's attention, and willingly gives up custody of her daughter without protest. It's easy to see why Mayu ran away from them in the first place. The fact they they remain unpunished for their actions makes them all the more loathsome.
The Big Bad, Director Kakuzawa, is a genocidal rapist with a God complex. He is the man who runs the Diclonius research facility, which performs horrific experiments on Lucy and the other Diclonii, and represents the cruelty of humans.
The Unknown Man, who could easily make a top 10 list of one of the most evil monsters in manga history. He makes a child Diclonius suffer an unfathomably horrible cycle of And I Must Scream before killing her, and assaults Nana and Mayu with full intent to rape the latter (hell, maybe even the former, too, just cause.) And when Bando arrives on the scene to save Mayu, he's revealed to be a pathetic, sniveling coward, and runs out of the house (not before getting bloodily beaten and having his Abnormal Ammolodged up his ass, though). He's finally killed by Lucy during a later confrontation between her and Bando.
From Fruits Basket we a number of Abusive Parents in the Sohma family, who aren't above using their Curse Zodiac children for profit, blaming them for the suicide of their spouse despite being partly at fault, and even outright abandoning them because of their curse. However, the worst of them is Ren Sohma, the mother of Akito Sohma. She is the cause of many of Akito's issue, between raising her as a man and telling her how worthless she is, which results in the latter abusing other members of the Big, Screwed-Up Family as head of the family. Ren's reason? Jealousy for her husband loving their daughter more than her. She even planned to abort Akito if her father, Akira, didn't agree to raising their daughter as a man.
We also have Tohru's unpleasant paternal relatives, with the exception of her grandfather. When she moves back after renovations were complete, they treat Tohru like absolute crap, berating her for very little thing she did, even though she was nothing less than polite to them. Granted, they didn't agree to relationship between her parents, as they mostly disliked that her father, Katsuya, married her mother, Kyoko, who was a delinquent in her youth, but that's no reason to assume Tohru is just as bad, and then accuse her of "shacking up" with Kyo, Yuki, and Shigure, after they hire a detective agency to investigate the poor girl. They even had enough goll to mock her Katsuya, and presumably Kyoko, at their respective funerals.
BasqueGrand in contrast to his more noble manga counterpart, could always be trusted to carry out Amestris' army dirty work (basically every war crime in the book and whatever unethical experiments the Government Conspiracy would conduct) and never lost an opportunity to pull rank to hinder the Elric brothers and rub it in their face purely out of spite. Despite being an unambiguously villainous character whose own physical prowess seemed to guarantee an epic fight against either the bros or Mustang, he never manages to antagonise the heroes further than that as he gets brutally murdered by Scar in a scene which appropriately mirrors Tucker's death from the manga.
Being petty, selfish and abusive, Dante represents the worst of humanity and is clearly not meant to be liked. With the tentative exception of Pride, all of her Homunculus minions either hate or fear her, with even Envy seeing her less as a mother and more as a means to obtaining his vengeance against his father and both of the Elrics are repulsed by her cruelty.
The Gold-toothed Doctor is as very bad as Shou Tucker. He willingly sides with the Homunculi For Science! and the Evulz, treats everyone else around him as pawns and as things for him to experiment on, acts completely nonplussed by the impending end of the world (he's the only one of Father's human allies who knows his full plans, incidentally), and slits a beloved character's throat to force a Sadistic Choice on said beloved character's love interest.
Shiho Nishizumi from Girls und Panzer, is cold, abrasive toward others, disapproves of her daughter abandoning her tank to save the lives of her teammates, and is considering disowning Miho because she doesn't like the way she does tankery. To drive things home, it's clear that Miho has given up on actively trying to gain Shiho's approval, and the only reason Maho does what Shiho tells her to as Nishizumi heiress is so that Miho will be able to live as she wishes.
By the time of Der Film, Tsuji Kota, the MEXT official who ordered Oarai Academy to be shut down also counts. At the time of his introduction in the anime, general consensus was that he was just doing his job, but the idea that he was anything close to a Reasonable Authority Figure faded in the movie, when he went back on his (non-written) promise. He did his utmost to try to prevent the students from doing anything, first by threatening to fire the employees working at the school if the girls protested, and later, after being forced into allowing the girls another chance to win for their school, forced them to fight the professional University Strengthened Team in an 8 on 30 annihilation match, while also allowing the UST significantly better weapons than most of the other teams could manage. By comparison, the actual leader of the University Strengthened Team (the team Oarai must defeat to remain open) is a sympathetic character who becomes friends with the protagonist.
Goblin Slayer has the Goblins. An Always Chaotic Evil race that exist to make other people's lives as miserable as possible, they have no sympathetic or redeeming qualities in the slightest, and will take advantage of anyone who shows them mercy. They kill every non-goblin they get a hold of and will rape any woman they capture. For every Kick the Dog moment they commit, you're going to want the Goblin Slayer to kill them as brutally as possible.
Even in a series full of psychopaths, Shio and Asahi's father stands out as the single most unlikeable person in the planet. An abusive alcoholic, he spares no love for his wife and children, beating them frequently and using them to fuel his unhealthy habits. A flashback would later reveal that he a also raped his future wife because she accidentally pushed him, celebrated the death of his own father because it left him with a big inheritance, left his wife and son and only came back after spending all his money. No doubts that he deserves to be called a demon by Asahi.
The manager of the Princess Imperial gets envious of Satou for her being well-received by her co-workers, and resorts to kidnap and rape Mitsuboshi in a feeble attempt to maintain power.
Hayate the Combat Butler has Hayate's father and mother, an unemployed man and compulsive gambler respetively, who leech off their son when he has to take jobs to earn money to support his life and sell his organs to the Yakuza to pay off their debts. When they make their appearance in the final Story Arc, they sabotage Hayate's job as Nagi's butler both for the fun of ruining the former's life and to get latter's money. This makes it so satisfying when they finally get their well-deserved punishment.
High School D×D has many antagonists, but these particular three characters earn the honor of being the most loathsome:
Raynare, the Starter Villain and Token Motivational Nemesis. She gets close to Issei only so she can murder him and steal his Sacred Gear. She later kills Asia Argento and steals her Sacred Gear right in front of him, continuing to toy with his feelings. She's not even liked by her own allies, and in the end, her Stupid Evil tendecies get her taken down by Issei as he leaves her to be finished off by his love interest Rias Gremory.
Diodora Astaroth, an associate of the Khaos Brigade. He was the Devil Asia healed, intentionally getting her excommunicated from the church and planned her death so he could her resurrect her as part of his peerage. He wants to make Asia a part of his harem, seeing her only as a sex toy to play with. His disregard for her earns him the ire of Issei's peerage, and his well-deserved beatdown.
Abyss Rage Dragon: Níðhǫggr. He kidnaps Issei's parents, uses them as hostages to beat the crap out of Ophis, and then fantasizes about how good the former couple will taste in front of their son while fondly reminiscing over his beatdown on the latter. His actions are so abhorrent and cowardly that fellow Evil Dragon Crom Cruach turns on him.
Tonpa of Hunter × Hunter. A Fat Bastard who intentionally sets back the main characters and other participants of the Hunter exams for no other reason than to see them fail and does it with absolutely sadistic glee, to the point that he's nicknamed "Tonpa the rookie crusher."
Naraku of InuYasha is completely devoid of redeeming qualities. He's nothing but a Dirty Coward and a Smug Super who commits all manner of horrible atrocities and goes out of his way to ruin the lives of everyone he comes in contact with simply because he can. He's this In-Universe as well; literally every named character, including several of his own mooks, which are directly spawned from his own flesh, despises him and wants him dead.
Iron Ladies: Oh boy, quite literally every antagonist in the story so far is an irredeemable scumbag willing to abuse their power and kill thousands of innocent people over whatever reason they can think of. Examples include letting thousands of soldiers die in battle out of spite for their commanding officer wrecking your car, holding the little brother of a woman hostage to force her to murder people for the amusement of the rich and corrupt, treating a sentient race as cattle and shooting them for sport and using hundreds of thousands of people as fuel for their war machines. Luckily most of these assholes get what's coming to them, usually in the shape of a Cruel and Unusual Death delivered by the heroes.
Kaguya's father. He drags her a quarter of the way across Japan (causing her to miss out on a chance to hang out with her friends), and barely even acknowledges her presence when she shows up. This is immediately followed by the reveal that he has never given her even the most basic form of parental affection. Then he forbids her from attending the fireworks festival, sending her into a Heroic BSoD. And all of this is in his first appearance.
Ogino. He was cheating on his girlfriend, and tried to buy Ishigami's silence when he found out (by offering to let him sleep with said girlfriend). Then he pulled a Deliberate Injury Gambit, making it look like Ishigami was a Stalker with a Crush.
A Silent Voice: Miki Kawai in the manga, Naoka Ueno in the film adaptation. In the manga, Ueno at least admits to being a horrible bully back in elementary school, while Kawai tries to gaslight Shoya into believing that never happened and that he was the main bully to Shoko. In the film, Kawai isn't shown being mean to Shoko, while Ueno is shown being mean, even violent, and unapologetic.
In Kotoura-san both of Haruka's parents are nearly universally hated by fans due to their (mis)treatment of Haruka. Considering they have no redeeming qualities, this is intended. The mom Kumiko, while is a Jerkass who did disown her daughter due to revealing her affair and considered to send her to a mental ward, paid the price for her own actions and came to regret the disownment; she really did try to help Haruka but failed. The father? He's a Karma Houdini.
Quattro, a Smug Snake who at her best, enjoys making fun of her younger sisters and at her worst, has absolutely no regard for human life and thinks those who do so are foolish, and this in a series with only a couple actually evil characters out of a massive cast. That she is such a ratbastard definitely makes her Villainous Breakdown all the sweeter when Nanoha blasts the crap out of her from across an entire space ship. Yes, even through the walls.
Back in the days, Precia Testarossa was made with this trope in mind. She was horrifically abusive to Fate, treats her as nothing but a tool that she despises and all around a horrid mother, that she'll shoot right up as one of the worst mothers ever and an utterly unsympathetic person. However, once the series gained popularity, especially also Fate's popularity, they decided to tone this down, turning Precia into a more sympathetic Tragic VillainJerkass Woobie, and around the same time, the fans were introduced to the Huckebein family, which is much more reviledagainst the creator's intents, and the INNOCENT manga revamps Precia into a doting mother. Safe to say, at that point, Precia no longer qualifies as this trope. (It also helps that there are other anime mother characters that picked up her left-behind essence of 'worst mother ever' more permanently with no chance of being fixed to be sympathetic. Seeabove)
My Hero Academia: At first, there was almost nothing redeemable about Endeavor. He dedicated his life to a petty One Sided Rivalry against #1 Hero, All Might, destroyed the family life he had with his wife and children, cared more about winning than being a hero, and has been putting Shoto into a cruel physically and emotionally abusive training ever since the boy was four or five. The closest thing he has to a redeemable quality is his concern for Shoto holding back in battle, but even that was for his own personal gain. Even Kōhei Horikoshi calls him a shitty dad. Outside of that, he's shown to be an asshole on the job, being a hero in the most technical of terms. He's very cold to fellow heroes and the people he's trying to save.
Subverted, however, he has a Jerkass Realization and begins changing. Furthermore, his relationship with his wife is re-examined briefly when it's revealed the reason he chose her wasto balance his shortcomings. She herself comments on how he had her favorite flowers delivered to her, despite her only mentioning once. Additionally, his concern for Shoto's restraint with his power becomes more prominent when it's shown how damaging Enji's own Quirk is to himself as well as to his firstborn, who had stronger flames, but a weaker constitution. Shoto is uninhibited by this weakness because of his ice, but without using his fire, he'd succumb to similar cold-related issues like frostbite. Additionally, his concern becomes more justified given the stronger foes that are coming and Shoto's own losses forcing him to having to improve.
Mizuki is theopening villain who takes advantage of Naruto's goal to be a ninja and reveals he's the container for the Kyuubi while trying to kill fan-favorite Iruka? Pretty bad. Brought back in a filler arc to reveal he had always been The Sociopath, hated his "friend" Iruka all along and was just using him, was secretly working for the then-Big Bad Orochimaru the whole time, is a Bastard Boyfriend to his Love Martyr fiance, and has outright killed comrades in the past when convenient? Holy shit. To top it all off, his least favorite food is ramen.
Hidan is cruel psychopath and member of a Religion of Evil, who worships violence and death, and sees mercy as a sin. He slaughtered his village simply because he was disgusted with their pacifistic way of life, and performed gruesome rituals to attain immortality for himself. And unlike the rest of the Akatsuki, he has no real Freudian Excuse for his actions. On top of that, even the series itself seems to posit him as the most unsympathetic major villain, as he's exempt from the Cycle of RevengeAesop pervading the storyline with his Fate Worse than Death. Too bad some fanstook it in another way.
Considering all the terrible things he has committed and that despite all his statement that he is doing everything for the sake of the Konoha, almost all of the disasters that fell upon Konoha are directly or indirectly was caused by him, Danzo Shimura seems to serve no better purpose than this. It's not help that unlike the others villains of series who were also Well-Intentioned Extremists, he has no real Freudian Excuse for his actions except his envy to Hiruzen that make him even worse.
Kaguya and Black Zetsu have taken over this role after The Reveal that they the ones who truly responsible for every bad thing that's ever happened in the Naruto universe.
Yashiro Uchiha, a minor member of the Uchiha clan who showed up in the flashback arc leading up to the massacre, becomes this in Itachi's Story. He's a Jerkass who has little patience for Itachi's idealism, and while not the mastermind of the Uchiha plot for a coup, he was one of the members pushing Fugaku to rebel, despite warnings that it couldn't possibly end well for the clan or the village. When Itachi carries out the massacre, Yashirobegs for his life, and even dishonestly claims he'll call off the coup if he's spared. While Itachi is broken by slaughtering the clan, particularly killing his girlfriend, his parents(who Face Death with Dignity) and one of Danzo's subordinatesnote One of two twins who impersonated a dead Uchiha and had to be killed to tie up loose ends he loathes Yashiro and feels no guilt about subjecting the man to aCruel and Unusual Deathby torturing him withTsukuyomi, then decapitating him.
Spandam from the Enies Lobby arc. Rob Lucci and the other members of CP9 are too cool/quirky to really hate and this also applies to many other One Piece villains, but Spandam's main quirk is how despicable, incompetent, and weak he is in spite of his inflated view of himself. He eventually gets the snot slapped out of him god-knows-how-many times by his former prisoner, Robin. And given his treatment of her and general personality, he deserves every single one of them. And the viewer likely won't be feeling much in the way of sympathy when she later snaps his spine.
AdmiralAkainu. Remember Ohara? He was the one who ordered the civilian ship to be blown up. Marineford? Rest in peace, Ace.
Every scene the World Nobles appear in just makes viewers hate them even more. Besides Doflamingo's family, none of them ever showed any redeeming quality. They just keep doing horrible things, confident that their status lets them do whatever they want. They buy and kidnap people to make them slaves, shoot people just for not kneeling before them, make slaves eat Devil Fruits just for their own sick entertainment and much worse. Many characters suffered under them including Fisher Tiger, Hancock and her sisters and Koala, not to mention one of them (nearly) killed Sabo. Eustass Kid, himself a Psychopathic Manchild, claims that even the worst pirates are absolutely nothing compared to the World Nobles. Because of their horrible, horrible actions, it's a moment of celebration when Luffy punched Charloss in the face and no Admiral went after him for it.
The Donquixiote Pirates comes off as weird and quirky, they're too much funny to hate. Other than Dofflamingo, it's Diamante who's the most hated character in the Dressrosa Arc. Being a titled "hero", is a sociopath that loves to play dirty, gloats about killing the loved ones of the families in front of him, and has no likability throughout the manga and anime. It was a good thing his bragging came to his downfall.
You can't hate Yume Hasegawa of Pupa since she was a monster who escaped the laboratory after being experimented on for thirty odd years. You can despise Shiro's adoptive father Genjurou Iamari due to him perversely torturing Shiro as a young boy, implanting in his mind that abuse was the purest form of love.
The Rising of the Shield Hero has Princess Malty Melromarc, the one who betrayed Naofumi and falsely charged him for raping her. Her sole reason for existing is to corrupt and ruin the lives of anyone she comes in contact with, and any attempt to correct her behavior results in her committing a bigger atrocity. Even as a fragment of Medea, her treachery and crimes make her more and more loathsome with every appearance.
Really, everyone outside of Naofumi, Raphtalia and a small handful of minor characters falls under this early on, as even before his reputation is ruined Naofumi is still treated as a complete joke compared to the other heroes. His abuse at the hands of everyone around him gets to the point that it's perfectly understandable that he comes within a hair's breadth of going full Woobie, Destroyer of Worlds when he thinks Raphtalia is going to be taken away from him.
School-Live!: While the zombies are disturbing and creepy monsters that have killed countless amounts of people, they are also compleatly mindless and have a tragic element to them nonetheless, so you can't really hate them. The same cannot be said for most of the Melee Fight Crew, with the exception of ShinouUhara. The group are a bunch of ruthless murderers who will do anything to survive, even if that means killing several of their own people by locking them outside with the zombies. They're also incredably hostile to outsiders and are implied to have murdered people just because they might be infected. Takahito and Ayaka are especially horrible. Takahito is the leader of the MFC and the one who plans out and decides their atrocities, and while he certainly acts like he has the team's best interests at heart, he ultimately only cares about himself and on top of everything else he's also a massive Hypocrite, as he tries to save himself when he's infected by first hiding his infection and then letting a massive swarm of zombies inside to kill everyone inside, including his own allies. Ayaka is a complete sociopath who views the zombie outbreak as a good thing and secretly hates everyone around her for not enjoying the death and chaos caused by the zombies, and she is very fond of sadistically taunting and murdering whoever she can. And Takashige is a complete brute of a thug who physically abused Hikako for not being able or willing to kill a zombie and also tried to murder Kurumi, a teenage girl, just because he found out that she's infected, despite her posing no threat to him. With this in mind, it is very satisfying to see Takahito slowly dying horribly due to the Airborne Virus and being unable to save himself while also going through a brutal Humiliation Conga that ends with him being brutally murdered by Ayaka, and Ayaka herself being stuck in the middle of the street with several zombies ganging up on her.
Chazawa of Shirobako spends basically every moment of his appearances in season 2 making it more difficult for the main characters to produce the anime version of Third Aerial Girls' Squad, and it's eventually revealed that this is fully intentional on his part. Much of the second season is in fact spent trying to overcome his interference, and MusuAni very quickly cottons on, complaining about him and mocking him whenever he comes up. Fans reacted much the same towards him, and both In-Universe and out his Laser-Guided Karma payback in episode 23 was met with joy.
While the series has plenty of Jerkass students and arrogant rivals at the elite culinary academy Tootsuki, Subaru Mimasaka's methodology and tactics against his competitors, by copying their dishes to perfection and making improvements to it until his version of the dish is one step ahead in every category, is criticized by his peers and competition judges. What fuels for readers is Mimasaka besting the series' leading Ensemble Dark Horse during the Tournament Arc from out of nowhere, with a dash of Diabolus ex Machina. However, he eventually pulls a HeelFace Turn and uses his copying skills to help Soma during the Moon Banquet Festival.
On the other hand, Elite 10 number 9 Etsuya Eizan, the one who pushed Mimasaka into his worst ways is even worse. Not only he's openly a Corrupt Corporate Executive, he goes as far as hiring corrupt judges to win Shokugekis, and spends most of his match with Soma trying to break his spirit, and even sends his thugs to harass Soma's friends. And in his match against Takumi, he deliberately uses an ingredient that will clash with Takumi's own, so its incredibly cathartic watching Takumi out gambit him completely by anticipating his dirty tactic and using it in his favor, utterly crushing him.
Azami Nakiri manages to be even worse due to his record of physically abusing Erina into adopting his mindset on cooking, which caused the rest of the Nakiris to disown him. Unfortunately, he ends up returning due to his allies in the Elite 10, who appoint him as headmaster. He then turns the tough-but-fair academy into a place where students are forced to imitate his chosen elites rather than polish their own style of cooking. Not to mention he also held Jun's research hostage in order to force Akira to serve Central. Anyone who opposes him has to deal with rigged exams, corrupt Shokugeki judges, etc, though it's not confirmed if he's endorsing his followers' foul play.
Soul Eater: Medusa, a relentlessly cruel Manipulative Bitch who treats her own child like a test subject and initiates the plot with her wicked schemes. Whether or not she's the Big Bad of the series is a matter of debate, but she's definitely The Heavy and continues to play a large role throughout.
Strider Hiryu: Vice Director Matic manages to be a bit detestable before the reveal he was evil, it's implied he had a hand in the brainwashing of Hiryu's late sister Mariya, which got ten Strider trainees killed, forcing Hiryu to kill her himself, and also, while bad enough that he ordered Hiryu to kill his friend Cain who got captured by enemy forces, it's also implied he was the reason Cain was captured and brainwashed in the first place, all so that Hiryu can kill Faysus Clay as part of his plot to take over the ZAIN Project. In the manga, he also planned on using Hiryu and Cain as scapegoats in the attempted assassination of Kuramoto.
Kuradeel from Aincrad. He's a Stalker with a Crush toward Asuna, but what puts him into "downright loathsome" territory is when he poisons the rest of his party, paralyzing them, and plans on killing them all and claiming that he was the only survivor. When Asuna almost kills him, he cowardly tries to appeal to her conscience, then tries to kill her, only for Kirito to kill him, resulting in Kuradeel dying a pathetic death.
Also from Aincrad, there's Grimlock, who hired Laughing Coffin to kill his wife because she was becoming stronger and more assertive in-game. Kirito and Asuna are completely disgusted by his motive for the crime, and declare that he never loved her.
Endou and her two accomplices also count, being bullies who use Shino "Sinon" Asada's trauma of guns in order to extort money from her. It's even worse in the light novel, as it's revealed why they did that. The three of them extended an insincere offer of friendship to Shino in order to take advantage of her, since Shino lived alone and they wanted to use Shino's apartment to throw parties. When Shino finally got fed up with being taken advantage of, the other girls researched her past and used it against her out of revenge. The three girls are portrayed completely unsympathetically, and it's very satisfying to watch Shino turn the tables on them.
Eiji Nochizawa of Ordinal Scale. Despite being a Tragic Villain, his many Kick the Dog moments and being a Smug Super negate any sympathy the audience would otherwise have for him. While Shigemaru takes no pleasure in the crimes he commits and is very pained the whole way, Eiji gleefully abuses his power as he beats down his fellow players.
Raios Antonious and Humbert Zisek. The two of them, both high-ranking nobles, look down on Kirito and Eugeo for being commoners, belittle their flashy sword techniques and even sever the buds of Kirito's flowers just to get back at him, but that isn't the worst of it. Humbert gives his page Frenica completely inappropriate orders, such as having her give him a massage while naked, and Raios lets this happen. When Kirito and Eugeo's pages, Ronie and Tiese, confront the two over their actions, they go flying over the Moral Event Horizon by tying both of them up and trying to rape them while making Eugeo (as well as Kirito) watch, hoping that their enemies will be driven to break the rules. When Humbert gets more than he bargained for and Eugeo cuts off his arm, Raios has no sympathy for him, gleefully relishing the process of killing Eugeo personally until Kirito intervenes and cuts off both Raios' arms, at which point Raios demands that Humbert risk his own life to save Raios. No one feels much sympathy when Raios' Fluctlight collapses, resulting in his death, although Eugeo has a brief My God, What Have I Done? moment over his first violation of the Taboo Index.
Valkyrie Drive: Mermaid: Charlotte Scharsen seems to have no other purpose in the series than to display how Teens Are Monsters. She's unbelievably arrogant, vicious, vindictive, vain, and worst of all, petty. There is not a single appearance where she's not either contemplating to Kick the Dog, or actually doing so. She surrounds herself with a Paid Harem, and she always seeks to make an example out of anyone who so much as suggests violating even the smallest of Mermaid's rules, whether the offender is aware of it or not. Those who object just simply haven't been beaten down hard enough. From as early as episode 2, it's clear that there is no despicable act she's willing to overlook in this endeavor. By contrast, the actual Big Bad Momoka Sagara is a Woobie, Destroyer of Worlds due to her treatment by The Organization, and even gives a Kick the Son of a Bitch moment to Charlotte.
ViVid Strike! has the trio of bullies. Angered by Rinne's refusal to join their martial arts club (Rinne wants to go home and see her ailing grandfather), they bully her over a period of several months, culminating in destroying the tiepin Rinne got from her grandfather, breaking her phone and knocking her unconscious, preventing Rinne from seeing her grandfather before he dies. The next day, Rinne flies into a rage and brutally beats up the three. Immediately afterward, one of them lies to her brother and claims Rinne attacked her without any provocation, clearly intending to manipulate him into seeking revenge on Rinne.