Villainous Breakdown/Fan Works

"Rem: Light Yagami, I did not realize you were capable of having feelings."
 * In the All Things Probable story, A Friend In Darkness, Monkey Fist, who was usually the most calm-minded and suave villain in the series, suffers from one of these in the final battle of the story after being humiliated, reducing him to raging and shrieking like an actual monkey while unleashing the dark power he had been cursed by. The irony is, his breakdown wasn't caused by Ron Stoppable, his actual Arch Enemy and the one more likely to drive him into one.
 * In the Zero no Tsukaima Fate Stay Night crossover The Hill Of Swords the villainess Sheffield starts out as a Smug Super supremely confident mage that swiftly devolves into a raving lunatic as Shirou outmatches her in each of their encounters. During their final encounter in chapter 22 she spends quite a bit of it just shrieking "DIE!" as Shirou refuses to do just that. The breakdown is so bad that she
 * In the Law and Order Special Victims Unit fanfic Girls' School, Lucy Horowitz, a girl accused of holding down another girl as the other girl was raped, has one after learning that.
 * In The Legend of Spyro fanfic A Dark Beginning, Dredd, the commanding Ape on the Tall Plains, has one of these after he discovers Kane escaped, going from Faux Affably Evil to screaming his death threats and his You Have Failed Me trait surfacing. After
 * The Big Bad in The Man With No Name has a mental battle with the Doctor..
 * from the Pony POV Series loses her cool a bit every time Twilight manages to fend off her mind games, but snaps completely once
 * Discord has two in "Origins". The first is when Mimic reveals to him that the bridge between Ponyland and Earth has been destroyed, thus protecting humanity from him. Discord is rendered speechless for a few minutes and left so beside himself with anger as to forget he's an omnipotent Reality Warper long enough for Mimic to perform her now famous Dying Moment of Awesome. The second comes when
 * Discord had a hysterical breakdown in Progress, when Luna turned him to stone in the dream world. He went from psychotic fury to frantically pleading for mercy in the space of a few seconds.
 * Several in With Strings Attached:
 * Kerrun as she realizes that the four aren't on her side after all; and, later, when she goes off the deep end completely and declares that every skahs in Ehndris is actually an Idri.
 * Jeft has two:
 * in The Tainted Grimoire had a brief one before being defeated. He became a Graceful Loser after being defeated.
 * Razor in Ace Combat: The Equestrian War. Due to . When he tries to do it himself later,.
 * In Project Gethinator, the Big Bad, Admiral Daro'Xen, who is Yandere in a big way for Commander Shepard, loses it quite spectacularly after Shepard decisively turns down her advances and calls her on her crazy scheme and her obsession with him..
 * Loki, the Big Bad of My Little Avengers (a Fusion Fic of My Little Pony Friendship Is Magic and Marvel Comics) loses it during the Final Battle when . Likewise, his Dark Avengers each have small scale ones of their own during their own fights with the other Avengers -- Ghost Flyer has the "This Cannot Be!"-panic variety when Captain Equestria breaks through his Penance Stare through sheer willpower, while Iron Monger and Red Skull both go into blind rages when Firebird and Iron Pony turn their own Hannibal Lectures back on them.
 * Queen of All Oni: Lung starts cracking when it becomes evident that his plan to break Jade to his will is failing, and then he breaks completely when her minions show up to save her.
 * Drago eventually has one due to the repeated failures of his attempts to gain power in the past. He ultimately snaps and rants that rather than doing things strategically, he's just going to smash everyone and everything in sight and see what effect that has on the timeline.
 * Freeza gets it bad in Dragonball Z Abridged during his fight with Goku, due to his exposure to Goku's remarkable stupidity.
 * Ponies Make War has a couple. First, Nihilus -- who wasn't all that sane to begin with -- completely loses her shit when . Then, near the end of the story, Empyrean totally falls apart when the Mane Six break into his throne room to confront him, and fires off the magical equivalent of a Wave Motion Gun to try and fry them.
 * In Fever Dreams when  Light very calmly goes up to his room, collapses into bed, and screams into his pillow.
 * Ponies Make War has a couple. First, Nihilus -- who wasn't all that sane to begin with -- completely loses her shit when . Then, near the end of the story, Empyrean totally falls apart when the Mane Six break into his throne room to confront him, and fires off the magical equivalent of a Wave Motion Gun to try and fry them.
 * In Fever Dreams when  Light very calmly goes up to his room, collapses into bed, and screams into his pillow.


 * Inner Demons: Twilight Sparkle stopped being sane the moment she was consumed by her Queen persona, but even by that standard she really flips her shit during the Battle of Fillydelphia when she realizes that her beloved brother is choosing to stand against her with the protagonists. She starts ranting and screaming that she'll kill all the heroes, Shining Armor included, and is only stopped from carrying out an execution on Cadence by the other heroes arriving in time. Interestingly, they also somewhat accidentally calm her down from the breakdown when they then confront her over