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18 Overpowered Anime Villains Who Were Practically Invincible

Father from Fullmetal Alchemist. Sousuke Aizen from Bleach. Madara Uchiha from Naruto. These characters might seem different, but they have one very important thing in common - they're all totally OP anime villains. 

Invincible anime villains must walk a fine line between creating meaningful challenges for the heroes to overcome and creating challenges that are actually impossible and require the heroes to go beyond the rules established by canon. When their defeats work, it's awesome - but when it doesn't, it can be a disaster. Still, it's always exciting to try and find out how seemingly unbeatable anime villains will finally bite the dust. Which ones are your favorites?

  • 1

    Mereum Was Terrifying From Birth In 'Hunter X Hunter'

    Photo: Madhouse

    As the king of the Chimera Ants, it goes without saying that Mereum would be ridiculously powerful. He's proud of his strength and thinks of those he says are beneath him as expendable fodder who he can destroy or even eat. He's so strong and fast that he was able to slap the heads off of multiple squadron leaders with his tail, moments after he was born. He's strong enough to punch through walls, and fast enough to move without anybody being able to detect it. He can survive poison, explosions, and go for at least six days without rest or food. 

    He's eventually taken out by the Poor Man's Rose, a chemo-explosive weapon. While he survives the initial impact, he succumbs to the poison it leaves him with. He passes away playing a game called Gungi with a young blind girl named Komugi - the only person he ever felt any genuine affection for.

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  • As one of the most powerful known members of the already ridiculously strong Uchiha clan, Madara Uchiha is about as OP as they come. Seriously, not even death can defeat this guy - he literally used the technique Izanagi to make it so that when he passed away, his demise would be rewritten into a dream, and he would continue to live. He gets even more powerful after he's revived for a second time and Kabuto makes some modifications. Madara possesses enough stamina to fight for 24 hours straight and has chakra reserves deep enough to allow him to summon a statue from a cage on the moon. He possesses not just the mangekyo sharingan, not just the rinnegan, but the rinne-sharingan, and he also has the Ten-Tails sealed into his body. He's immune to ninjutsu attacks while being master of a hundred of them, and he has the ability to instantly heal his injuries. This isn't even a complete description of his terrifying prowess, but it's already clear that this man isn't joking around.

    Despite all this, Madara is still defeated. How? Black Zetsu stabs him in the back and forces him to absorb the chakra of all the people trapped in Madara's Infinite Tsukuyomi - a dreamlike state in which he'd trapped the entire planty. During this process, Kaguya Ootsutsuki is sealed into her own dimension, but not before she turns into the Ten-Tails and spits out Madara, effectively ending his life. Complicated? You bet it is, but that's Naruto for you.

    Like this OP villain?
  • Sousuke Aizen is not someone you ever want to find yourself fighting against, because he is not only ridiculously strong, he's also brilliantly manipulative. He spent years persuading everyone that he was a loyal and mild-mannered member of Soul Society, only to launch one of the most memorable betrayals in anime history. Not only is his physical strength off the charts, but Aizen can also do things like teleport, regenerate, and more. He can even take full control over all five of another person's senses, making it impossible for them to even begin to guess what he's doing or act accordingly. 

    He's ultimately defeated by Ichigo Kurosaki's use of a powerful attack called Mugetsu, which severely damaged him and forced him to regenerate to a weaker form. After that, Kisuke Urahara was able to seal his powers. Surprisingly, Aizen went willingly to prison after that, having changed his outlook on life somewhat by this point.

    Like this OP villain?
  • 4

    Ainz Ooal Gown Doesn't Realize How OP He Is In 'Overlord'

    Photo: Madhouse

    Ainz Ooal Gown might be the only character on this list who is actually unbeatable - and that's probably because he's a villain protagonist. As a guild master, he's considered the most powerful of the Almighty 41 Supreme Beings, for a variety of reasons. He's able to use a spell that gives him the strength of a Level 100 warrior, and he boasts countless other spells as well. He has his own pocket dimension where he keeps weapons and other items, he can use Super Tier Magic (a system of magic that does eveything from creating tornadoes to granting wishes) and he can use a variety of techniques that plow through his opponents' resistances to destroy them instantly. Will he ever be taken down? That remains to be seen.

    Like this OP villain?