Complete Monster/Fairy Tail

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Much like *Rave Master*, *Fairy Tail* tends to avoid this trope, being even more idealistic and giving most villains some Pet the Dog moments or a reasonable Freudian Excuse. But these don't have either.

* Master Jose Porla of Phantom Lord. His envy towards Fairy Tail for its sudden rise in power and wealth due to Lucy (which the person had no intention of using) drove him to use Gajeel to destroy the guild hall and later hung up Team Shadow Gear as an example. This earns Makarov's wrath and when the two encounter each other, Jose being an illusion, he shows no ill will and says some small talk to further enrage his rival, enough for his minion to drain him of all his magical power temporarily. When Lucy hits him in the nuts, his first step is to have his guild robot destroy a town and torture Erza. This is all because Makarov said, while drunk, that his guild was better while at an annual guild meeting.
* From Erza's past there are two slavers. They forced thousands of captives to build the Tower Of Heaven employed even children (among which, Jellal and Erza) to do this work, starving them almost to death, punishing and killing them over the most insignificant slight; and they weren't above some Cold-Blooded Torture as well - it was because of a particularly brutal beating from them that Erza lost one of her eyes. Killing them both was obviously Jellal's making as a villain, but they deserved it.
* Faust, the King of Edolas, supposedly desires eternal magic for his kingdom, but in the end only wants it for himself. He conducted a plan called "Anima" to absorb all of Earth Land into Edolas as Lacrima for fuel, but his son Mystogan eliminated most of the portals save for one in Magnolia City. Consumed by greed, he eventually orders the genocide of all Exceeds and uses his army's desperation for Magic to rile them. During "Code ETD", he siphons the Dragon Slayers of their magic to create a chain to throw the giant Lacrima containing Magnolia City residents and facilitate in Extalia's destruction. When Mystogan thwarts it, Faust personally leads a final assault in the Dorm Anima, callously shooting down his son and promising to turn Natsu, Wendy, and Gajeel into living batteries to fund future Anima plan attempts. His burning of Coco's legs and disregard for Pantherlily's life in a crossfire outs Faust as a power-hungry and avaricious king.
* From the moment we meet Jackal, one of Zeref's demons and a member of Tartaros' Nine Demon Gates, he is established as a psychopath who gleefully assassinated the Magic Council in front of Doranbalt so viscerally that at least one of his kills required a Gory Discretion Shot. He then goes on to force not one, but two Sadistic Choices on a former Magic Council member and Lucy, forcing them to choose between their own life and their granddaughter's life, and the life of the Magic Councilor and a pregnant woman respectively, and says that his only real motivation for doing so is that he see humans as playthings. He then later kills one of his own guildmates right in front of Lucy for the crime of annoying him. Out of all of the Etherious, he could very well be the one most deserving of being called a demon.
* Acnologia "The Black Dragon of the Apocalypse" was once a dragonslayer who was supposed to be a savior of humanity and a bridge between them and dragonkind. Instead, he became a scourge upon both, slaughtering countless dragons, even the ones friendly to humans, for fun. Becoming a dragon did nothing to improve his demeanor. Everywhere he goes, he spreads death and destruction. He doesn't even speak most of the time because he thinks humans are vermin that are beneath him, despite the fact that he used to be one. When he finally speaks, it's mostly rants about how he desires nothing but destruction. Then he brutally murders Igneel right in front of Natsu. When he decides to take center stage in Alvarez's Invasion, Acnologia targets the other Dragon Slayers to wipe them out and reveals his intention to simply annihilate everything that lives, while keeping the only immortal wizards as playthings to torture forever.
* Zash Caine from *Dragon Cry* was once a wizard of Fiore who fled to Stella after a failed coup. He went into the service of King Animus and then proceeded to kill his own allies to prove himself. In the present day, Zash uses mind control to force the White Tiger squadron to kill each other in order to steal the Dragon Cry. Zash shows no hesitation in trying to kill the Fairy Tail wizards, and is even willing to mind control others to do so. It is revealed that Zash keeps female prisoners to draw blood from to power his own magic, and takes Lucy captive in an attempt to draw blood from her. Towards the end, Zash betrays Animus and takes the Dragon Cry for himself. He proceeds to force Animus to go on a rampage and unseals the Quartum Army to eliminate the Fairy Tail wizards. He then activates the Dragon Cry in an attempt to destroy all of Fiore out of revenge for his exile, only failing when the power proves too much and incinerates him.