Complete Monster/Nickelodeon

Much like Cartoon Network, some Nickelodeon shows have their own monsters as well.


 * Avatar: The Last Airbender: Fire Lord Ozai, a genocidal, child-abusing fascist dictator who seeks to Take Over the World and has dedicated weeks at a time and large portions of his national army to hunting down and killing a twelve-year-old and his friends. Perhaps best exemplified in the first episode of the four-part finale, where his reaction to news of rebellions in the Earth Kingdom is to . While the aforementioned heinous act is his crowning achievement of irredeemable abomination, he's also physically abused his son Zuko, by burning his face for speaking out of turn, and  Furthermore, he
 * The graphic novel miniseries, The Search, makes him even worse, if that was possible. It's revealed he never had any true lover for his wife Ursa, seeing her as a possession to covet rather than a romantic partner. The reason why he treats Zuko so horribly?
 * The sequel series, The Legend of Korra gives us a similar character in Unalaq, the holier-than-thou chief of the Northern Water Tribe and Korra's Evil Uncle. Beneath his self-righteous preaching, Unalaq craved nothing but power, and would do anything, no mater how deplorable, to get it. He had more resentment towards his older brother than Ozai did for his, and less concern for his two children than Ozai did for his, too.
 * In the previous season of the same show, we had Yakone, an evil bloodbender from the Water Tribe. The backstory shows him as a feared crime boss of Republic City in it's early days, one who used illegal bloodbending to control and harm others. His bending was so strong, he could bloodbend without need of the full moon. He'd planned to use this power to Take Over the City until Avatar Aang had him brought to justice. But he simply bloodbended the entire coutroom in order to make his escape, and when Aang tried to stop him, he bloodbended his body with the intent of snapping his neck. Fortunately, Aang overcame him and took his bending away. The worst part about all this?
 * Justin Hammer from Iron Man: Armored Adventures is a young weapons manufacturer whose company Hammer Multinational is the main competitor to Stark International. Hammer hires the super villain known as Mr. Fix to work for him and later injects Fix with a nano virus that will kill him if he disobeys Hammer. After Iron Man defeats Hammer's Titanium Man armor, Hammer blames Fix for the armor's failure and uses the nano virus to kill Fix's body, but uploads his mind into Hammer's computer systems, much to Fix's dismay. After Stark International lands a big military contract, Hammer decides to get revenge by placing a control device on Stane's Iron Monger armor and sends Iron Monger on a rampage. After receiving blackmail messages from an unknown party (actually sent by Mr. Fix.), Hammer becomes increasing paranoid and Ax-Crazy. Hammer starts attacking anyone who he thinks may be responsible, including his own men. Hammer uses a new chemical weapon called Z Gas to turn crime boss Count Nefaria into a zombie and then kidnaps and tortures Killer Shrike, one of his former henchmen. Hammer then turns Shrike into a zombie. After Iron Man broadcasts evidence of Hammer's crimes across the globe, Hammer starts to lose it and plans to release the Z Gas on New York City.
 * Dark Danny/Dan Phantom, from Danny Phantom. He is the only villain in the show who has actually been implied to kill anyone, which is saying a lot for a Nickelodeon show. His origin (and for some, his entire episode) is considered to be Nightmare Fuel. Singlehandedly handicapped multiple ghosts and ruined what is implied to be a very large portion of the Earth. The guy is so bad, that this is the only time that the Master of Time has had to interfere to keep it from happening.
 * The Adventures of Jimmy Neutron has several silly villains, but one who really stands out as completely vile is Meldar Prime, who ran an intergalactic game show where he forces different alien races to compete against each other and he blows up the losers' home planet. Not even Tim Allen's funny delivery in voicing the character could change the fact of how evil he was and that Jimmy and the others treated him as a very serious threat to the galaxy.
 * Kung Fu Panda: Legends of Awesomeness has Tong Fo. While all the villains of the franchise have at least one sympathetic or redeeming trait, the character most likely to be called a Complete Monster is Tong Fo, being Faux Affably Evil and seriously depraved. He makes his debut trying to destroy the Valley of Peace with a powerful hammer, seemingly for no reason other than because he can, as he never gives any reason for wanting to destroy the Valley. In "Father Crimes" when he manages to capture Shifu, he heavily implies that he's going to torture him, physically and mentally. In "Kung Fu Club", he blackmails Peng into fighting Po to the death by threatening to order Peng's girlfriend to be killed if he doesn't cooperate. On top are his repeated attempts to kill Po in nasty ways, in particular in "Mind Over Manners", where he pretends to want to help Po, then almost immediately reveals that the "help" in question will kill Po by making his head explode. And his reasoning for his life of crime is that he wants to live up to the legacy of his felon grandfather - by going even further than he ever could! His Christopher Walken impression voice can't even disguise what a total psychopath he is.