Anime Underground 15 Scary Anime Monsters That Are Total Nightmare Fuel  

Leo Reyna
26.8k votes 4.9k voters 127.3k views 15 items

List Rules Vote up the most frightening anime monsters that keep you up at night.

"Everybody loves monsters." This quote from former Doctor Who star, Peter Capaldi, is right on the money, which is why the anime world is filled with some of the creepiest, most horrifying creatures of the night. Monsters are among the most fascinating characters of fiction. It's entertaining to see their apathy, barbaric attitudes, and their hideous appearances.

Anime monsters don't skimp on the nightmare fuel. All the scary anime characters on this list have a large appetite for blood, guts, and destruction. They have a thing for inflicting pain or a strong desire for survival. Not every monster is the typical ugly, bulky demon. Scientific or supernatural, these scary anime monsters are guaranteed to keep you up all night. Hold on to your bed sheets as you read about the scariest anime monsters of all time, and vote up the most terrifying, dark creatures that stalk the night. 

1 2,223 VOTES

Parasites - Parasyte: The Maxim

Parasites - Parasyte: The Maxi... is listed (or ranked) 1 on the list 15 Scary Anime Monsters That Are Total Nightmare Fuel
Photo:  Madhouse

Always go to bed with your headphones on. That's the message of the day, brought to you by Parasyte: The Maxim. In this sci-fi horror anime, wormy aliens called Parasites crawl into the ears of people to assimilate with them. Parasites pull an Invasion of the Body Snatchers by completely erasing their host's identity.

Those who possess humans develop a hunger for other humans. They also hunt Parasites that failed to completely assimilate with their host. If you feel something funny in your ear during bedtime, it's already too late. 

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2 1,557 VOTES

Gauna - Knights Of Sidonia

Gauna - Knights Of Sidonia is listed (or ranked) 2 on the list 15 Scary Anime Monsters That Are Total Nightmare Fuel
Photo:  Polygon Pictures

Any alien species powerful enough to drive the entire human race off Earth is worthy of the scariest anime monster title. In the mecha anime series, Knight of Sidonia, the shapeshifting alien race known as the Gauna sent mankind packing, forcing them to live on spaceships created from what was left of Earth. A Gauna cannot be easily killed because of their exterior covering called the Placenta. It is highly malleable and usually appears as tentacle creatures.

The creepy thing about the Gauna is that they are capable of replicating human features for a limited time. They will make their appearance match that of a lover so a soldier can't deliver the final blow. 

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3 2,834 VOTES

Titans - Attack On Titan

Titans - Attack On Titan is listed (or ranked) 3 on the list 15 Scary Anime Monsters That Are Total Nightmare Fuel
Photo:  Wit Studio

It's pretty evident why the Titans from Attack on Titan would rank among the most scariest anime monsters around. Nude giants with the freakiest of faces, they run amok and devour humans like they're hors d'oeuvres. Even walls of crazy heights aren't enough to protect humanity from these unsettling creatures, which is why the post-apocalyptic world of Attack on Titan is one of the most dangerous anime locations in history. 

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4 1,930 VOTES

Boar Demon - Princess Mononoke

Boar Demon - Princess Mononoke is listed (or ranked) 4 on the list 15 Scary Anime Monsters That Are Total Nightmare Fuel
Photo:  Studio Ghibli

Nothing gets the blood pumping faster than being chased by a demonic pig. In the shockingly violent Studio Ghibli film, Princess Mononoke, a tremendous boar becomes a wild demon, demolishing everything in his way. The boar's flesh rots as a swarm of crawling demon worms engulf his body, acting as an armor for its host and forming tentacles to attack.

It's a beautifully animated scene of such a hideous beast. 

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