Possible inherent spoilers ahoy, so read at your own risk. Team Rocket, the bumbling Ineffectual Sympathetic Villain buffoons who stalked a ten-year-old for 13 years, had an occasional genuinely good plan that is foiled only due to Ash's sheer determination , and were extremely competent as good guys. Best Wishes they are taking about a thousand levels in badass. As of the XY series, they are back to their old bumbling selves, though still retain a more formidable streak compared to early on.
During the Sun and Moon series, they collect a more formidable team of Pokemon with Jessie's Mimikyu set up as a rival for Pikachu and go on to actually win a battle against Ash fair and square. They quickly return to their bumbling ways afterwards He seems very passive early on, and is actively supportive of Euphemia's idea of the Special Administrative Zone in Japan.
It's only near the end that we begin to see just how far he'll go to accomplish his goals, and just how little of a conscience he has. Nina Einstein has this trope covered pretty well in her own right.
Who would've thought that her handiwork killed more people in about ten seconds than any of the other characters killed? Way to earn that last name. Then he destroys the world. Klein from Fresh Pretty Cure! Then he transforms into a large humanoid lizard with enourmous strength and high speed and is pretty much more powerful than Northa in her monstrous plant form, giving the heroines a hell of an asskicking.
And then both of them fuse together to become an even more powerful being. Lithuania in Axis Powers Hetalia is a small country in Europe with a Kick the Dog history that resulted in him being seen as the number one woobie on the show. Etemon from Digimon Adventure is a Large Ham showboater with a fondness for rock and roll. The dub takes this a step further by giving him a voice and speech-style like Elvis Presley.
His debut alone marks him as this type of villain, as he's shown to be a goofy-looking guy capable of destroying an entire village with a single attack while also de-powering the heroes and he has got a network that allows him to observe the entire continent Server.
The only reason he never manages to kill the children and their Digimon is because of a series of very bad luck rather than incompetence. He's also one of the few enemies to come back from the dead and take a level in badass to become MetalEtemon all while rocking' it out. And despite the main villain of the Dark Masters' second part is Pinocchimon, it's MetalEtemon who kills an ally. Archnemon and Mummymon are basically the Digimon Adventure 02 's version of Team Rocket's Musashi and Koujirou , yet they are not as harmless as their goofiness would let on.
Since both of them are Perfect-level Digimon, the heroes' Digimon are only able to fight them when they Jogress Evolve, but if they are any level below the duo, both will definitively dominate them. Archnemon is still capable of creating Dark Tower Digimon and is practically the mother of The Juggernaut BlackWarGreymon who she can't control and it is shown that her mere presence is enough to make Dark Towers prevent Digimon from evolving.
They also manage to build Dark Towers across the entire Real World, resulting Digimon to travel to the Real World who are all causing havoc. While that plan is ultimately foiled in the end thanks to a Next Tier Power-Up , both of them carry out their boss's other plan and kidnap children in Tokyo while the heroes are busy fighting Digimon outside Japan.
When they show up with all those children, Ken is stuck with a Sadistic Choice: Impmon was a pest to the Digimon Tamers cast instead of a villain, throwing fire balls and scaring their Digimon away. No one saw him as anything more than a nuisance. However, as the fight carried on, Pan and Goku realized that he was still a threat, the pollution he spread was weakening them, making them tire out and easier for him to fight.
He then tries to throw them into the polluted lake, hoping to drown them and dissolve their bodies. If he hadn't fallen for Goku's Wounded Gazelle Gambit in the end, he could very well have won. Then there is Cell who was also part of the Red Ribbon Cyborg project. Sorbet from Dragon Ball Z: The first impression of him is just that of a young boy, and a little girl in the manga. This impression fades quickly upon the revelation that he is one of the most powerful Mazoku Lords, a fact he proves by effortlessly killing the previous Big Bad Chaos Dragon Gaav, another Mazoku Lord.
He plays merry hell with the protagonists as the rest of the season's Big Bad , and they are nearly helpless against him. It takes a literal Deus ex Machina to take him down for good.
In season 2 there's an unnamed Mazoku that looks like a giant tribal mask with arms and legs. The only thing Lina can think of is how stupid he looks, and he seems to get quickly dispatched almost immediately after appearing. He comes back later, though, and proves to be a surprisingly tough nut to crack, mostly because he can summon several smaller masks that do an excellent job of protecting him from Lina's magic doesn't help when Lina decides to Dragon Slave the entire building, though.
An arc in Kyouran Kazoku Nikki introduces Gouyokuou. In the episode he is introduced, he seems to be a hilariously Fish out of Water alien looking for the woman he loves and so weak that Kyoka is able to punch him into the air with ease. Then it's revealed that he is so powerful, if even one of his Power Limiter rods is removed, he can level a city with no effort.
If all of them are removed, it's Earth-Shattering Kaboom time. The end of the second episode of his arc hints at a darker side of his personality; a Stalker with a Crush willing to use his world destroying powers to get the woman he wants.
Kyuutarou Ooba from Kemonozume spends most of the show as a harmless if somewhat eccentric bureaucrat before revealing himself as the show's primary antagonist, a criminal mastermind, and a hyper-wealthy, nihilistic psychopath who masturbates with a girl's dismembered arms and markets a medicine that makes people eat each other. He's also revealed to have grafted monster arms onto himself that give his round little body incredible strength, and intentionally mutates himself to the point where he's just a constantly shifting mountain of flesh by the series's final episode - one that delivers monologues on the futility of existence, natch.
Pesci from JoJo's Bizarre Adventure Part 5 starts off as an incredibly weird-looking, cowardly sidekick to the more competent Prosciutto and has a seemingly weak Stand-ability as well.
Upon Prosciutto's defeat however he suddenly gains new resolve, comes up with lethal new ways to use his Stand and ends up becoming one of the most dangerous foes the gang faces during the part. Before long, both his affiliations and his abilities prove far more sinister. Introduced to be nothing more than comic relief until he turns out to Madara Uchiha, a legendary Diabolical Mastermind who is insanely resilient, Made of Air , and can teleport himself and anything he touches to anywhere , with his "good boy" act presumably to hide the fact that he was the real power behind Akatsuki.
Even after it's revealed that he's actually Obito Uchiha, it doesn't keep him from holding his own against Killer B, Naruto, Kakashi, and Might Guy, four of the strongest ninja in the world, all at the same time until his intangibility's weakness is found out. Foxy the Silver Fox. Foxy's a flashy, fame-hogging, pigheaded fool. He's pudgy, strange looking, and needs his crew to constantly buff his ego or he'll sink into depression. Oh, and he's also got a really powerful Devil Fruit ability that allows him to get the drop on anyone and pound them into oblivion before they know what's hit them.
To be more specific about Foxy, his ability slows everything down to the point of almost stopping it in place. Furthermore, whatever hits they recieve while they're slowed down will be delayed until the fruit's effects wear off, causing all those attacks to hit all at once. Thanks to this ability, low blows and cheap shots, he was able to beat the living daylights out of Luffy, and even came close to actually defeating him a few times.
Unfortunately for him, he was Hoist by His Own Petard when Luffy used a mirror shard to reflect his ability back at him. The funny thing is he was going to allow them to get past him so his boss will get in trouble, but they had to go ahead with their suicidal idiotic somewhat predictable otherwise ingenious plan of taking him out, only to face an asskicking for it.
When first introduced, the combination of nearly dying of starvation and his still being shell-shocked from his encounter with Hawkeye Mihawk left him seeming rather pathetic.
Near the end, we get The Reveal that Gin is actually Don Krieg's right hand guy, and he promptly takes down the heavily armored Pearl with one shot and then hands Sanji his ass. Not only that, it's implied that Gin is actually stronger than Krieg, and is only second-in-command because he's been too loyal to make a move against his boss. The workers of Water 7, including a bartender named Blueno, a stern and hot-tempered secretary named Kalifa, a happy-go lucky shipwright as well as a possible new crew mate , and finally the aloof Rob Lucci.
Too bad all of them were actually undercover agents for a powerful assassination force for the government, proceeded to beat the crap of the Straw Hats and are total Blood Knight fighters.
When Sanji, Usopp, and Franky meet him on the Sea Train, he offers them noodles from his nose, and has an equally wacky face to match. The three heroes immediately proceed to blow him off and try going to the next car to confront the actual Big Bads, only for Wanze to get serious and do everything in his power to stop them.
He is an agent of Cipher Pol after all, and he later shows that most of his various silly expressions and quirks are actually just acts to mislead his opponents. While his main power is still making noodles from his nose, he manages to use it to great effect and even overpowers the strongest of the three, Sanji. Too bad he picked the wrong opponent for a one-on-one fight, as he's ultimately Hoist by His Own Petard as Sanji is a chef, and him using food as his weapon allows Sanji to use techniques he usually reserves for cooking and not fighting.
As Sanji gets the upper hand, Wanze takes his danger progression Up to Eleven by throwing a poison knife at Sanji at relatively close range, though he ultimately misses and is defeated. Due to the semi-serious nature of its first half, followed by the seriousness of the second half, Gundam ZZ does this to a few people.
In the case of Chara, it was mainly her playing the Fanservice card with that whip. With Mashimar Cero though, the somewhat-bumbling but honorable and idealistic Neo Zeon officer returns as a brutal and cruel officer that oversees a Colony Drop.
In the first half Glemmy Toto is a joke character in a joke squadron led by a joke commander, but by the end he's revealed himself as a clone of Gihren Zabi, the franchise's original Big Bad , and set himself up as a rival to Big Bad Haman Khan, sparking a devastating Enemy Civil War in the process and unleashing an army of clones.
Yammy Llargo, rampaging idiot and Decima Espada zig-zags with this trope. At first it seems he's incredibly weak, he reveals that he's actually the Cero Espada and technically above Starrk. And he still gets his ass kicked. Then he reveals that he's not at full power, and he powers up. Adding insult to injury, Kenpachi called their fight "boring". Dordonii is initially shown as a somewhat eccentric and comedic villain until he reveals to Ichigo that he used to be an Espada and proceeds to beat the shit out of him.
They seemingly do nothing but argue with each other, very nearly coming to blows , which constantly leaves them open for attack. Next thing you know, they use their powers to create a giant chimera named Ayon, which utterly destroys four Vice-Captain Shinigami. Captain-Commander Yamamoto-Genryuusai himself had to personally get involved in that ordeal. Sternritter Askin Nakk Le Vaar comes across as a cowardly, ineffectual fighter with no real offensive powers when compared to his fellow members of the Wandenreich, yet not only is he chosen to be among Yhwach's Elite Guard when invading the Soul King's Palace, his power is revealed to be one of the most broken abilities among their numbers.
As a result, he manages to catch both Nimaiya of the Zero Squad and Grimmjow off-guard, defeats Ichigo after his most recent Took a Level in Badass , smashes Yoruichi and her brother Yuushirou into paste without mercy, and gets the better of Kisuke Urahara , lampshading that he's been completely underestimated until it was too late. Florsheim in Tentai Senshi Sunred is presented as being an organization of nice guys, average Joes and all around friendly people despite the fact that they're monsters.
They constantly lose to Sunred and are seen as nothing more than a joke. When a new villain group steps in, Sunred directs them to fight Florsheim first and they get beaten immediately. There's a reason Florsheim's held their territory for so long. Miyo Takano from Higurashi: Sure, she was awfully suspicious in season 1 and 2 but Wow. However, that person has an excuse. Shorin appears somewhat unimpressive to his opponents and having power levels only barely above what he needs to pass although the opponent he defeated in the first round was even weaker.
He turns out to be the demon Rando, who killed 99 martial arts masters after stealing their techniques , and Yusuke only realizes this by process of elimination - he keeps up the facade until he manages to shrink and defeat Kuwabara using a technique he stole.
Zig-zagged with Onji in the Dark Tournament.