Complete Monster/Bleach

Bleach has Loads and Loads of Characters, but the sheer depravity of a particular few is enough to warrant an addition to this page, and it isn't pretty.

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Hollows
These guys are The Heartless, with a fair Freudian Excuse for their acts, but some take it too goddamn far when they don't even need to.


 * Grand Fisher. His power consisted of creating a lure based on the memories of somebody or assuming the form of his past victims in order to prevent someone from attacking. Not only did he do this with Ichigo's mother, but he also got off on it, treating it as a game. His favorite victims were women and children. It's immensely satisfying to see Isshin curb stomp him after Grand Fisher turns into an arrancar.
 * The Hollow Metastacia, who was responsible for the deaths of Kaien Shiba and his wife Miyako. His ability allowed him to possess his victims; he first did this to Miyako, and made her murder several of her subordinates before killing her. When tracked down and confronted later by Kaien, he said that he regretted "not eating the rest of that female soul reaper". Kaien jumps into battle with Metastacia, but ends up getting possessed as well. Metastacia sadistically taunts a petrified Rukia about her love for Kaien before attacking her. His self-inflicted death is very satisfying, despite him ending Kaien's life at the same time.
 * The Hollow Shrieker was shown to have been a Complete Monster even before he turned into a Hollow. A serial killer who stabbed a woman named Shibata to death and got off on it, his greatest regret was being killed before being able to do the same to the woman's young son, Yuichi. After he became a Hollow, he sealed poor Yuichi's soul into the body of a parakeet and lied to him, saying that if he could escape from him for three months, he'd revive his mother - and Shrieker would kill and eat the souls of anyone trying to help the child. He gets a very appropriate comeuppance, however - after Ichigo kills him, he is sent to Hell by Rukia for the serious crimes he committed whilst still alive, because the Zanpakuto can only cleanse Hollows of sins committed whilst being Always Chaotic Evil. Shrieker is the only Hollow seen to receive this treatment, which says a lot about how bad he was - even Grand Fisher was only a Complete Monster whilst a Hollow (or at least hadn't committed sufficiently serious sins whilst human).
 * The Hollow Numb Chandelier. She mind-controled the Karakura students via shooting seeds into their bodies, tortured Orihime and Tatsuki when they tried opposing her, planned really squicky tortures and deaths for both of them (like having the boys gangrape Orihime and then forcing her to commit suicide, or mind-controlling her to strip naked before throwing herself off a building in public) while telling the girls what she plans for them, and forced Tatsuki and Chizuru to beat up Orihime for her own amusement. It's a HUGE relief when Orihime develops her powers, heals Tatsuki and splits Numb Chandelier in half, releasing the Karakura students in the process. (And this is the only villain that Orihime, normally a total pacifist, ever killed.)

Arrancars
These are the Bishounen Line for the Hollows. At best, they're likely to be a Jerkass. At worst.... well, keep reading.


 * Szayel Aporro Granz, the 8th Espada. As a Mad Scientist for the arrancar, Szayel likes nothing more than pulling the organs out of people via voodoo dolls and then smashing them to bits. In particular, before the organ-breaking began, he toyed with his enemies' heads by ripping apart one out of two voodoo dolls in half, only to reveal that the only parts that can be felt from a voodoo doll are the toy-like organs on the inside. Beforehand, he had specifically modified his underlings to serve as healing aids - by devouring them whole, he'd be able to heal himself. Now, in regards of what he did to poor Nemu...well, bluntly put, one of his abilities allowed him to invade any convenient host (the petite Nemu) that had maintained physical contact with him during his death, devour Nemu from the inside to reconstruct his original body, horribly enlarging Nemu's stomach and emaciating her to near-death, and then burst fully grown from her mouth head-first, leaving Nemu an anorexic husk, whose condition was so bad that she had to get groped by her father to get healed back to normal. What's worse is that the amount of time it took for that to finish was just a tad bit too long, giving the impression that he was initially trying to burst through her "special opening", before deciding to move out of her mouth instead. He also deconstructs the trope of Avenging the Villain by stating that he is the younger brother of Ilfort, an arrancar that Renji had killed, but has no intention of avenging him. In fact, he infected his brother with mini-spy cameras in order to gain an advantage in their fight, even comparing the loss of his brother with the loss of a box. All in all, he is so terrible

Shinigami
The guardians of the Soul Society are many things, much of them bad, but rarely are they ever as bad as this.

"I said it in the beginning...I've finished studying the Quincy. Finished studying! Observed the result of all kind of physical and mental stimuli! Opened skull alive... Forced one to burn his own son to death. Chopped up bodies. Ground bodies. Studied them until they were rendered piles of lifeless limbs!"
 * Mayuri Kurotsuchi, the Gotei 13's resident Mad Scientist, was introduced like this, being responsible for the death of Ishida's grandfather, conducting experiments on living subjects and making use of human bombs - even exploding one of them just because "a bomb isn't supposed to come back". However, through Characterization Marches On, he is now being portrayed as a Jerkass Heroic Sociopath for whom it is possible to actually root for, especially when he's up against Szayel. His previous actions seem to have been swept under the rug...and many fans don't agree with this.
 * After using Ashisogi Jizo on Uryu to take away his ability to move, he says that killing him would be just as easy as strangling a baby. Based on what you know about him by this point, you probably can wonder if he's talking from experience.
 * The anime cuts out a certain part of the manga where he actually explain what experiments on the Quincy he performed: pure acts of savagery and sadism with zero scientific value, unless you are the most fucked up scientist who ever lived. He's the Josef Mengele of the Soul Society. As you read the following quote, note the expression on his face while he says that. One of the most insane Nightmare Faces around.


 * Longtime Big Bad Sosuke Aizen has pretty much qualified for this since he was first outed as a villain: he manipulated his naive lieutenant Momo Hinamori to be devoutly loyal and supportive of him by adopting a kind professor's facade, and coldly stabbed her while hugging her, nearly shattering her sanity and incapacitating her for well over a month. The kicker? His manipulations were so successful that she still believed he was innocent, even after nearly dying by his hand.
 * Continuing further, several years beforehand, Aizen had forcibly spawned monstrous abominations inside eight shinigami officers to test out his latest experiment, coldly slashed or insulted the few that actually managed to maintain any sort of sanity to accelerate the process, intended to murder every last one of them almost immediately thereafter, and when that failed, deviously placed the blame on several of his superiors instead, thereby prompting the feudal government to (attempt to) exile or incarcerate each of them. What's worse is that, by transforming the eight officers into Hollow hybrids, Aizen had destroyed the officers' chances of ever being accepted back by their friends and colleagues, having been turned into the Soul Society's most feared and detested of adversaries, as well as sullying the reputations of the three exiles, all three of whom were assumed to have been dead, disappeared or were painted as co-conspirators by their friends, colleagues and superiors.
 * Aizen wanted to negate Yamamoto's Zanpakuto, so he turned Wonderweiss Margera into an zanpakuto-negating arrancar. In essence, Aizen erased all of Wonderweiss' intelligence, speech, memory, reasoning and emotions, in order for the ability-negating aspect to work efficiently, all so that Wonderweiss could negate the abilities of one person. It's so bad that Yamamoto himself, a hardened veteran of countless scars and battles - is disgusted to the point of actually calling him out on it, Aizen justifies it by claiming that, since hollows (Wonderweiss' species) lack a purpose in life, turning one of them into an autistic doll was his way of giving Wonderweiss' existence meaning, retorting that Yamamoto was the cruel one for killing Wonderweiss and destroying the very same purpose that Aizen essentially forced upon Wonderweiss. Not done yet: Aizen modified Wonderweiss to negate Yamamoto's fire-generating abilities, but made it so that those very same flames were sealed inside of Wonderweiss, who promptly exploded, nearly destroying an entire city almost immediately after his death. Then there's the implications of Wonderweiss not being that willing to do this in the first place.
 * Of course, Aizen managed to beat the rap by being a Magnificent Bastard for the majority of the time.... which makes his act of all the more horrific, and finally cemented him as an asshole through-and-through by much of the fandom, even several of his own fans. It's really clear here that Aizen could have effortlessly created the illusion they were attacking out of thin air. He actively chose to use another person for it, and at that specifically chose Hinamori whom he had already messed with.
 * Also, once he became a, his very presence was so powerful that it caused anyone who was near him - many human civilians - to blow up, killing over a dozen civilians, while he casually walked his way through a city. Why, you ask? Well, to give you an idea, when he met a human that was spiritually-aware enough to actually see souls, Aizen warned the guy not to get near to him....just for Aizen himself to walk closer to the human in question, promptly killing the guy seconds later; it was all for him to show off his new-found powers, as a means to quench his narcissism. After that, when he finally met Ichigo's human friends, he planned to
 * The bastard even lampshades his Complete Monster status - he claims to be above such "petty" things as ethics and morality, as he claims they would serve no other purpose than to limit his potential. In fact, this is why Aizen is such a terrifying and despicable person: he sees himself as an Ubermensch who is above everyone else, and is thus exempt from the notions of morality and decency adopted by "lesser beings", even mocking them as useless notions only the weak would cling to. Therefore, in his mind, he has the right to do whatever he wants, since he's so powerful that nobody can stop him from doing so.