The majority of the humans in the universe of My Hero Academia have supernatural talents called Quirks that bestow upon them extraordinary capabilities. Heroes and villains alike have a wide variety of Quirks that may be anything from ordinary to amazing. Certain Quirks, especially when used by bad people, stand out as particularly scary.
Certain Quirks, thanks to their morbid nature or their propensity to damage others, are the most horrific, frightful Quirks to confront in combat, but they may not be the most lethal. As a result, interacting with people who have these Quirks might elicit a far more primal, instinctual feeling of terror.
8 Overhaul: Chisaki's Destruction And Recreation Quirk
Chisaki not only used Eri for her power, but also developed guns that could neutralize Quirks. He had complete command over his environment and the people in it because of his Quirk, Overhaul, which gave him the ability to dismantle and rebuild everything he touched.
Using Overhaul, Chisaki was able to murder people and alter his environment to make it more terrifying. Fearsome as this quirk is, Deku was able to prevail against it and the rest of the heroes. Even now, it ranks among the most terrifying Quirks observed by viewers.
7 Warp Gate: Kurogiri's Transportation Quirk
Kurogiri is the League's organizer and the only adult revealed to be directly assisting Shigaraki. His special ability only helps him do this. Simply put, Kurogiri can use Warp Gate to make gateways that can move objects or people across the world.
The League has been able to penetrate several U.A. operations because of the Warp Portal, a powerful tool at their disposal. The ability's visual presentation is just as unsettling as the power itself. Many find his gateways unsettling because they resemble thick clouds of fog into which individuals vanish.
6 Decay: Shigaraki's Decaying Quirk
Starting with the USJ crisis, when he was first introduced, Shigaraki has proven to be a formidable adversary. His Quirk, Decay, lets him reduce objects to dust by rotting them from inside out. This Quirk began off simply spreading via objects Shigaraki had personally touched, but it has now developed into a terrifying power that can travel over and through stuff he decomposes.
It's no exaggeration to say that this Quirk is among the most terrifying powers at play right now. It's horrible to see, and even more terrible to try to stop. The fact that Shigaraki is the de facto second in command of the League and the successor of All For One further heightens the tension.
5 Rewind: Eri's Manipulation Of Body Quirk
Viewers first saw Eri while her caretaker, Chisaki, was abusing her for her powerful Quirk. She was saved, but it's still concerning that she can't rein in her powerful Quirk. With the use of her Quirk, "Rewind," Eri may return a person's body to an earlier time. This implies she can even murder someone by rewinding their body to the time before they were born.
Although Eri's Quirk has proven useful for her team, the terrifying reality remains that it is a powerful ability that may do enormous harm in the hands of the wrong people. Fans like her, but they can't ignore the fact that she hasn't mastered her terrifying Quirk yet.
4 Foresight: Nighteye's Prediction Quirk
Nighteye's power may not be as spectacular or obviously terrifying as some others, but it nevertheless strikes fear into the hearts of many, including Nighteye himself. When establishing physical contact with someone and seeing them in the eye, Foresight gave him the power to glimpse into their future. He might use this to his advantage in a variety of situations, such as determining an opponent's strategy in combat or even seeing a murder in progress.
Foresight was a difficult Quirk to possess and a terrifying thought to consider. It's a terrifying ability with endless potential for heroes and villains, whether used it to see the deaths of all one's family and friends or the deaths of all one's foes.
3 Bloodcurdle: Stain's Paralyzing Quirk
Stain was known as the Hero Killer for his heinous acts against various heroes he thought undeserving of the title. His Quirk, Bloodcurdle, enabled him to immobilize someone after drinking their blood.
Stain was a terrifying foe for the students because of his terrifyingly strong and generally dark ability. His Quirk's gory nature made him the ideal villain, particularly because he appeared to take pleasure in drinking blood.
2 Transform: Toga's Body Modification Quirk
Toga serves as one of Shigaraki’s henchmen. She has been a continual pain in the heroes' sides ever since she first debuted. Transform, her Quirk, gives her power to modify her looks such that she takes on the look of anyone whose blood she has recently ingested.
This blood-based talent is frightening by itself, but Toga's capacity to assume another individual's persona makes the Quirk much more terrifying. Toga is a formidable foe on the battlefield because of the combination of her deadly Quirk and skilled acting. If that wasn't enough, she can also use the Quirks of those she transforms into, although this only stands true for those she loves.
1 All For One: All For One's Power Stealing Quirk
The main enemy of the anime, All For One, is the one who helped shape Shigaraki into a formidable opponent. His power, All For One, enables him to take other people's powers and either retain them personally or give them to others.
All For One is a scary power that has enabled the character to mold those around him in whichever he pleases. The terrifying Quirk of All For One has finally aided in his ascent to prominence among villains and the upkeep of the villains' superiority over the heroes.