"People can list any number of reasons to be afraid. This is because at the most fundamental level, 'comfort' leads to 'life', whilst 'fear' leads to 'death'. While people cannot give a clear answer why they want to live, they can give any number of answers why they do not wish to die. Thus, it is impossible to be unaffected by fear as long as you are alive."
― Äs Nödt (Bleach)
"Gotham, this is your only warning, abandon the city, or I will unleash your greatest fears."
― Scarecrow (Arkham Knight)
"It was as if a Natural Calamity had descended upon them. In the face of that overpowering violence...There were those that could not even stand... Those that ran away...And those that could not move..."
― The Narrator on Hou Ken, the Bushin (Kingdom)
"Just the sound of my name in the Four other States' frontline territories is enough to my enemies lose control of their bladders. "
― Kan Mei, Giant of Chu (Kingdom)
"I will show you...true nightmares! Within the nightmare, I will give you...despair and death!"
The user can evoke and increase fear and horror in others causing the target’s brain to release fear-inducing chemicals. The target’s perception may be altered, causing them to see their environment as ominous and the user as dark and foreboding, or even as a monster.
Various fear poisons and fear enchanted weapons (The Elder Scrolls)
Left Hand of Horror (The Grim Adventures of Billy and Mandy)
King Sombra's Magic Door (My Little Pony: Friendship is Magic)
Helm of Hades/Helm of Darkness (Riordan Verse)
Demon Rage Magisword (Teen Titans Go!)
Mansion of Night (Percy Jackson)
Äs Nodt (Bleach), Sternritter "F", can amplify one's fear to lethal levels.
Whether it's his brooding appearance or his monstrous combat skills, Guts (Berserk) can cause intense fear in almost anyone...
Kuudo Hinokage (Medaka Box) induces an intimidating presence so powerful people cast him out of conscious thought and cognitive perception.
Misogi Kumagawa (Medaka Box) paralyzed even Zenkichi with fear…
…forcing him to tremble where he stands…
…and people don't even dare to shake his hand.
The prisoners of Level 6 of Impel Down (One Piece) have committed crimes so vile and evil that even the newspapers refused to write about them, the world fearing the inmates to the point that the World Government has to “erase” their existences from history.
The Yonko/Four Emperors (One Piece) are some of the most notorious and feared pirate captains in the world...
...Charlotte Linlin/Big Mom possesses a fear factor so great that even the Giants do not dare speak her name...
...With his status as the Strongest Creature in the World, Kaido's mere presence makes him so feared that people would rather risk declaring war on the World Government than anger him...
...highly dreaded throughout the world, Shanks ended the Battle of Marineford by merely threatening to get involved...
Because of his sheer ruthlessness, Sakazuki (One Piece) is feared by both allies and enemies alike, including the dreaded Blackbeard Pirates.
As a former bounty hunter and a pirate with a bounty of over 300 million, Roronoa Zoro (One Piece) can inspire fear with just a glare.
Users of Conqueror's/Haoshoku Haki (One Piece) can cause an intense amount of fear within those with a weak mindset...
...to the point of knocking them out with a simple stare.
Despite his nonchalant attitude, Saitama (One-Punch Man) can install an extreme level of fear...
King (One-Punch Man)
Kan Mei, the Giant of Chu (Kingdom)
While a laidback man, Rin Ko (Kingdom) was capable of causing fear...
...within the most hardened of warriors.
As a Bushin, Hou Ken's (Kingdom) mere presence caused intense fear within those around him...
With the single impact of his podao swing, Ri Shin (Kingdom) installed a deep sense of fear within the battle-hardened soldiers of the Gaku Ei Army after killing their leader.
After his Reawakening, Sung Jin-Woo (Solo Leveling) activated the ability called "Skill: [Bloodlust/Killing Intent]" by using strong energy, this skill can selected target is put in a state of fear for 1 minute.
All For One (My Hero Academia) is a villain feared by even the most powerful heroes.
Barbas, The Demon of Fear (Charmed) can literally scare people to death by bringing their fears to life.
As the chief enforcer of the Emperor's tyrannical will, Darth Vader (Star Wars) was one of the most feared beings in the galaxy.
It (Stephen King's It) in the form of Pennywise.
Lord Voldemort (Harry Potter) was one to be feared to the extent that many cannot bear even speaking his name until his death was confirmed during the Battle of Hogwarts.
Severus Snape (Harry Potter) exuded such ruthlessness that his mere presence alone caused his students to settle down from their banter and cause his Death Eater colleagues, and the savage werewolf Fenrir Greyback, to back down.
In order to feed, The Jeggorabax Energy Entity (The Sarah Jane Adventures) induced fear into its victims.