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A Quirk (個性 Kosei?, lit. "Individuality") is a special, superhuman ability an individual can possess. Quirks are generally unique to their user, and are classified in multiple categories.

History

Luminescent Baby (Anime)

The first Quirk.

The first person to manifest a Quirk was a newborn baby in the city of Qingqing, who had the ability to emanate light. After that incident, many people around the world began to manifest different kinds of special abilities. While the cause of the Quirk phenomenon is unknown, it has been theorized that the spread of a virus carried by mice had brought about their development.[1] Currently, around 80% of the world population possesses a Quirk.[2]

The dawn of this extraordinary era was marred by a breakdown of society caused by the sudden onslaught of criminals empowered by their newfound "superpowers". In this time, All For One became a symbol of unity in society. He used his Quirk to remove Quirks from those who did not want them, and give Quirks to those that did, under the guise of returning society to its prior state of humanity. In this way, he gathered a following loyal to him, allowing him to act out his ulterior motives. [3]

As society adapted to the new status quo, the Police Force moved to prioritize leadership and to maintain the status quo, and as such, decided not to use Quirks as weapons. To fill that void, the profession of crime fighting Quirk users, heroes, began to exist. Authorizing the use of powers that could so easily kill, however, was a greatly criticized decision at first. Over time, it came to garner public support due to the fact that the first people to work professionally as heroes acted morally and upheld the law.[4]

Information

Quirk Lineage

An example of Quirk heritage lineage of two families. The highlighted one is a rare mutation, completely different than all Quirks of the family.

Quirks are inherited genetically through what appears to be Mendelian inheritance and typically manifest in children by the age of four at the latest. Children will either manifest one of their parent's Quirks or a new composite Quirk formed by the fusion of the two. This composite Quirk may sometimes give the appearance of the person having two separate Quirks, such as Shoto's Half-Cold Half-Hot. Much more rarely, in the case of Eri's Rewind, a child may manifest a Quirk that is entirely unrelated to their genetic lineage, akin to a mutation.

As Quirks are said to be the next stage of evolution in the human race, it is possible to diagnose a person as lacking a Quirk by analyzing the presence or absence of an extra joint in their pinky toe. People with only one joint will develop a Quirk while having two joints indicates that the person will not develop a Quirk.[5]

It is possible for children to already be born with their Quirks. Such was the case with Present Mic[6] and the very first person to manifest a Quirk, the Luminescent Baby.[2] Although very rare, it is also possible for animals to possess Quirks, such as Nezu.[7] Under special circumstances, two Quirks may mutate and merge, becoming a new Quirk, as was the case of One For All.[8] It also appears that the physical mutations of mutation type Quirks can be inherited even if the Quirks themselves are not, as people such as Fumikage Tokoyami and Koji Koda have Quirks unrelated to their appearance.

There are instances where a Quirk doesn't suit the user's body and the body can't handle it. The most obvious example is Izuku Midoriya and his Quirk, One For All. Some people, such as Yuga Aoyama are naturally born with Quirks that their bodies can't handle. Yuga was naturally born with a Quirk that is too strong for his body and as such, he needs to wear a special belt at all times, since his Quirk would sometimes randomly fire on its own. His Quirk also hurts his stomach after using it for too long.

There are several laws and procedures to ensure the conscientious use of Quirks. During elementary school, children receive Quirk counseling, in order to learn how to use their powers responsibly.[9] Public display of Quirks are against the law,[10] except in cases of self-defense, such as when one is under attack or preventing someone else from being attacked.[11]

A popular line of thinking is the idea that Quirks will continue to mix together and deepen, growing in strength and complexity with every new generation. Eventually, Quirks will develop to a point where nobody will be able to control them anymore. This is referred to as the "Quirk Singularity".[1]

Quirk Factor

The term "Quirk Factor" refers to the collective traits that compose a Quirk. This includes the primary Quirk power as well as all the biological mechanisms that allow said primary power to function properly.

Certain Quirks such as Erasure are capable of halting the expression of the Quirk Factor, temporarily rendering the Quirk unusable, but not affecting the Quirk Factor otherwise. There are other Quirks, however, that are able to directly damage the Quirk Factor of a target, preventing the Quirk from being activated until the user manages to naturally recover. It's also implied that a Quirk Factor can be damaged beyond recovery, causing the Quirk to be permanently suppressed.

Known Quirk Types

Emitter

Emitter (発動 Hatsudō?, lit. "Activation")-type Quirks have the ability to either release certain substances, or alter materials around them in certain ways. Emitter-type Quirks usually require a conscious effort to activate (such as Electrification, Explosion, and Half-Cold Half-Hot), and some even require large amounts of concentration in order for them to remain active (such as Erasure).

Emitter-type Quirks can also have various ranges. While some users require physical contact to use them (such as Zero Gravity) others can have much longer ranges with no distance restrictions (such as Navel Laser). While most Emitter-type Quirks users generally have a handle on their own "emissions", it's also possible for users to hurt themselves from coming into too much contact with their Quirk (Explosion). In the case of generating substances, making too much too fast or for too long can harm the user as they are using reserves from their own body (Creation), or gradually lose their natural resistance to their own harmful Quirk (Acid). The emissions of Emitter-type Quirks can have a wide variety of properties and abilities.

While some substances produced by Emitter-type Quirks have common properties (Cement), some are unique to the user, and thus have special properties. Those who alter the properties of materials around them can also widely vary in effects, from molecular alteration (Softening) to molecular destruction (Decay). Emitter-type Quirks are, by a wide margin, the most common type of Quirk.

Transformation

Transformation (変形 Henkei?)-type Quirks cause the user to take on a temporary alteration of some kind. Transformation-type Quirks allow the user to temporarily "transform" their body in a variety of manners, sometimes enhancing existing features (Hardening, Gigantification) or perhaps adding new features to the body altogether (Tool Arms). Transformation-type Quirks generally affect the user exclusively, the only known exceptions being the Meatball Quirk.

Transformation-type Quirks usually require a close-range proximity in order to fully utilize them in combat due to them only affecting the user's body. Transformation-type Quirks are also the only known type of Quirk that can bestow the user attributes they do not normally exhibit by default. Transformation-type Quirks usually require a conscious effort by the user to "activate", though most users can be trained to initiate them reflexively (depending on the conditions required for activation) and practice to initiate their Quirks with greater intent and precision (such as with Edge Shot and his Foldabody Quirk, which he's mastered to change in any way in an instant). While Transformation-type Quirks are often quite powerful, their biggest weakness is that their effects are often temporary, and over-exertion usually leads to negative repercussions on the user's behalf. Transformation Quirks can also be limited based on the user, how resilient their body is, and the resources they have available to them (Tetsutetsu Tetsutetsu describes that his Steel Quirk softens if he doesn't consume enough Iron, and suffers from Iron Fatigue if he maintains the Quirk too long). Some users even condition their body in certain ways so that their Quirks can operate more effectively.

Because this type of Quirk combines the activation time and mutant-shape aspects of the other Quirk types, it is also often known as Hybrid or Composite. Transformation Quirks seem to be the least common type of Quirk.

Mutant

Mutant (異形 Igyō?)-type Quirks can have a wide variety of features and abilities depending on the individual, but the common similarity seems to be that these Quirks are a part of the user's physicality, causing the user to exhibit irregular bodily features that generally have some sort of purpose to them. As a result, Mutant Quirks are passively active and, at a glance, are the most identifiable.

Dupli-Arms

Mezo Shoji's Mutant-type Quirk "Dupli-Arms" dramatically malforms his arms, but lets him create other body parts from them.

Mutant-type Quirks create bodily structures that bestow the user more complex abilities that Emitter and Transformation Quirks cannot safely provide. Often times they will bestow prehensile appendages that allow for greater degrees of control (Vines) or structures added to pre-existing limbs to enhance pre-existing abilities (Engine). Mutant-type Quirks even have the ability to channel certain aspects of their user through them similarly to Emitter-type Quirks (Earphone Jack). While not necessarily a weakness, Mutant-type Quirks cannot be turned off, and sometimes cause the user inconvenience due to their malformations. Such is the case with Mashirao Ojiro and his Tail Quirk, (which makes it difficult for him to sit or lay down) as well as Toru Hagakure and her Invisibility Quirk, (which makes it impossible to see her reflection or show up in photographs). Though because these Quirks are passively-active, they are partially immune to Quirk-disabling effects such as that of Shota Aizawa's Erasure Quirk. Mutant-type Quirks are also the only known type of Quirk which can be passed down through generations without necessarily bestowing the corresponding ability (such as with Fumikage Tokoyami and his bird-like head that has nothing to do with his Dark Shadow Quirk, or Koji Koda's malformed head (from his mother's side apparently) which speaks nothing to his Anivoice Quirk). As a result of this, while it's uncertain how common mutant Quirks are, it can be safely assumed they are the most commonly inherited.

List of Quirks

Quirk Usage User(s) Type
Acceleration Acceleration Unnamed Villian

O’Clock

Emitter
Acid Acid thumb Mina Ashido Emitter
Air Cannon All For One defeats Best Jeanist Unknown User

All For One

Emitter
Air Walk Episode 47 Unknown User

All For One

Emitter
All For One All For One's Quirk All For One Emitter
Anivoice Anivoice Koji Koda Emitter
Arbor Arbor Kamui Woods Transformation
Assault Dust Assault Dust Unnamed Masegaki student Emitter
Beast Roaring Rage Jurota Shishida Transformation
Bendy Fingers Bendy Fingers David Shield Transformation
Big Horn Miyagi Daikaku Portrait Miyagi Daikaku Mutant
Binging Ball Binging Ball Unnamed Masegaki Student Emitter
Big Fist Big Fist Itsuka Kendo Transformation
Black Black Shihai Kuroiro Transformation
Black Hole Thirteen vs Kurogiri Thirteen Emitter
Blade-Tooth Blade-Tooth Moonfish Transformation
Blood Control Blood Control Vlad King Emitter
Bloodcurdle Bloodcurdle anime Hero Killer Stain Emitter
Boomerang Boomerang Itejiro Toteki Emitter
Brainwashing Izuku brainwashed Hitoshi Shinso Emitter
Bubble Bubble Bubble Girl Emitter
Cemedine Cemedine Kojiro Bondo Emitter
Cement Cement Cementoss Emitter
Centipede Centipede Centipeder Mutant
Chronostasis Chronostasis Chronostasis Mutant
Clones Clones Ectoplasm Emitter
Comic Comic Manga Fukidashi Emitter
Compress Compress Mr. Compress Emitter
Confession Confession Shin Nemoto Emitter
Copy Copy Neito Monoma Emitter
Cow Cow Cow Lady Transformation
Creation Creation thumb Momo Yaoyorozu Emitter
Crystallization Crystalization Yu Hojo Transformation
Dark Shadow Tokoyami dark shadow Fumikage Tokoyami Emitter
Decay Decay Tomura Shigaraki Emitter
Double Double Twice Emitter
Dupli-Arms Dupli-Arms thumb Mezo Shoji Mutant
Eagle NoPicAvailable Takahiro Unknown
Earphone Jack Earphone Jack Kyoka Jiro Mutant
Earth Flow Earth Flow Pixie-Bob Emitter
Elasticity Gently Trampoline Gentle Criminal Emitter
Electric Eel Eletric Eel Teruo Unagisawa Transformation
Electricity Generation Electricity Generation Elec Plant Emitter
Electrification Electrification Denki Kaminari Emitter
Engine Engine thumb Tenya Iida Mutant
Erasure Erasure thumb Shota Aizawa Emitter
Explosion Explosion Katsuki Bakugo Emitter
Extend-o-Hair Extend-o-Hair Nagamasa Mora Mutant
Fat Absorption Fat Absorption Fat Gum Transformation
Fiber Master Fiber Master Anime Best Jeanist Emitter
Fierce Wings Feather Blades Hawks Mutant
Fire Breath NoPicAvailable Hisashi Midoriya Emitter
Flight Flight Christopher Skyline Emitter
Fly Swatter Flyswatter Shoko Haimawari Emitter
Foldabody Foldabody Edgeshot Transformation
Food Meal Soramitsu Tabe Mutant
Forcible Quirk Activation Forcible Quirk Activation Unknown User

All For One

Emitter
Foresight Foresight Sir Nighteye Emitter
Frog Frog Tsuyu Asui Mutant
Gatling Gunhead anime Gunhead Mutant
Gigantification Gigantification Mt. Lady Transformation
Glamour Glamour Camie Utsushimi Emitter
Glide and Slide Skating Quirk Three Sturm und Drang Brothers Emitter
Glycerin NoPicAvailable Mitsuki Bakugo Emitter
Good Ear Good Ear Sirius Mutant
Gyrate Sen Kaibara manga intro Sen Kaibara Transformation
Hair Pluck Hair Pluck Mr. Brave Transformation
Half-Cold Half-Hot Half-Cold Half-Hot Shoto Todoroki Emitter
Hardening Hardening thumb Eijiro Kirishima Transformation
Heal Recovery Chiyo Shuzenji Emitter
Hellflame Hell Flame anime Endeavor Emitter
High Spec High Spec Nezu Mutant
Horn Cannon Horn Cannon Pony Tsunotori Mutant
Homing Homing Snipe Emitter
Human Lie Detector NoPicAvailable Naomasa Tsukauchi Unknown
Hypertrophy All For One using multiple Quirks Unknown User

All For One

Transformation
IQ IQ Saiko Intelli Mutant
Iron Claws Power Loader Profile Higari Maijima Mutant
Impact Recoil Impact Recoil Unknown User

All For One

Emitter
Infrared Ray NoPicAvailable Unknown User Emitter
Invisibility Invisibility Toru Hagakure Mutant
Jet Jet Gran Torino Mutant
Kinetic Booster All For One using multiple Quirks Unknown User

All For One

Emitter
Larceny Larceny Toya Setsuno Emitter
Leaf Manipulation Leaf Manipulation Unknown Yakuza Thug Emitter
Leap Bound Pop☆Step Emitter
Lizard Tail Splitter Lizard Tail Splitter Setsuna Tokage Transformation
Lock Down Lock Down Rock Lock Emitter
Long Legs LongLegs Unknown Thief Transformation
Love Love La Brava Emitter
Magnetism Magnetism Magne Emitter
Manifest Tamaki's Clamshell Hand Tamaki Amajiki Transformation
Meatball Meatball Seiji Shishikura Transformation
Meganetic Blaster Meganetic Blaster Ichimoku Samazu Emitter
Mimicry Mimicry Mimic Emitter
Monster Cat Merged Monster Cat Monster Cat Transformation
Multiplier All For One using multiple Quirks Unknown User

All For One

Transformation
Muscle Augmentation Muscle Augment thumb Muscular

High-End

Transformation
Mushroom Mushroom Kinoko Komori Emitter
Navel Laser Navel Laser Thoom Yuga Aoyama Emitter
Octopus Octopus Innsmouth Mutant
One For All One For All Izuku Midoriya (9th Holder)

All Might (8th Holder)
Nana Shimura (7th Holder)
5 Unknown Holders
All For One's Brother (1st Holder)

Emitter
Orcinus Orcinus Gang Orca Mutant
Outburst Outburst Ms. Joke Emitter
Overhaul Overhaul destroys Mr. Compress's left arm Overhaul Emitter
Oxidizing Sweat NoPicAvailable Masaru Bakugo Emitter
Permeation Permeation manga Mirio Togata Transformation
Plastic Transformation NoPicAvailable Mr. Plastic Transformation
Pliabody Pliabody Tiger Transformation
Poltergeist NoPicAvailable Reiko Yanagi Emitter
Polygraph Polygraph Makoto Tsukauchi Emitter
Pop Off Pop Off Anime Minoru Mineta Mutant
Power Transforming Arms Unknown User (Formerly)

All For One (Formerly)
Pankration
High-End

Emitter
Quad Arms Four Arms Fourth Kind Mutant
Queen Beam Queen Beam Unnamed Masegaki Student Emitter
Queen Bee Queen Swarm Kuin Hachisuka Emitter
Rewind Rewind manga Eri Emitter
Rivet All For One using multiple Quirks Unknown User

All For One

Transformation
Rocket Thrust Rocket Thrust Mazinger Brothers Mutant
Scales Scales Hiryu Rin Transformation
Search Ragdoll intro Ragdoll (Formerly)

All For One

Emitter
Shame NoPicAvailable Teruo Hazukashi Emitter
Sharp Edge Sharp Edge Togaru Kamakiri Transformation
Shock Absorption Shock Absorption Unknown User (Formerly)

All For One (Formerly)
Nomu

Mutant
Shoulder-Mounted Jets High End Flying Possible Unknown User (Formerly)

High-End

Mutant
Size Size Yui Kodai Emitter
Slide and Glide Sliding Koichi Haimawari Emitter
Sloshed Sloshed Deidoro Sakaki Emitter
Snake Hair Uwabami anime Uwabami Mutant
Snip Clip Snip Clip Monika Kaniyashi Emitter
Soccer NoPicAvailable Emperor Yotsuura Unknown
Softening Softness Anime Juzo Honenuki Emitter
Solid Air Solid Air Kosei Tsuburaba Emitter
Somnambulist Somnambulist Mignight Emitter
Spearlike Bones All For One using multiple Quirks Unknown User

All For One

Transformation
Spike Spikes Soga Kugizaki Transformation
Spirit Possession NoPicAvailable Nyikang Emitter
Spotted Seal Selkie Portrait Selkie Mutant
Springlike Limbs Springlike Limbs Unknown User

All For One

Transformation
Steel Steel Tetsutetsu Tetsutetsu Transformation
Stiffening Stiffening Shikkui Makabe Emitter
Strength Enhancer All For One using multiple Quirks Unknown User (Formerly)

All For One

Emitter
Strong Shoulder Strong Shoulder Kendo Rappa Emitter
Sugar Rush Sugar Rush Rikido Sato Emitter
Suicide Bomb Suicide bomb quirk Unnamed bomber Mutant
Super Regeneration Super Regeneration Unknown User (Formerly)

All For One (Formerly)
Nomu
High-End

Transformation
Swan Angel 206 Unnamed Criminal Mutant
Sword Sword Quirk Jube Namimaru Emitter
Tail Tail Anime Mashirao Ojiro Mutant
Tape Tape Hanta Sero Mutant
Telepath Telepath Mandalay Emitter
Telescopic Telescopic Tatami Nakagame Transformation
Toho NoPicAvailable Godzillo Mutant
Tongue Tank Tongue Tank Unnamed Masegaki Student Transformation
Transform Himiko Quirk Himiko Toga Transformation
Transforming Arms Transforming Arms Possible Unknown User (Formerly)

High-End

Transformation
Twin Impact NoPicAvailable Nirengeki Shoda Emitter
Vibrate Vibrate Yo Shindo Emitter
Vines Ibara defeats Denki Ibara Shiozaki Mutant
Vitality Stealing Vitality Stealing enhanced with Trigger Rikiya Katsukame Emitter
Voice Voice Present Mic Emitter
Warp Gate Warp Gate Anime Kurogiri Emitter
Warping Warping Unknown User (Formerly)

All For One

Emitter
Wave Motion Wring Wave Nejire Hado Emitter
Weld Weld Yosetsu Awase Emitter
Whirlwind Whirlwind Inasa Yoarashi Emitter
X Ray NoPicAvailable X Emitter
Yell NoPicAvailable Amplifier Emitter
Zero Gravity Zero Gravity Ochaco Uraraka Emitter
Zoom Zoom Anime Mei Hatsume Mutant

List of Unnamed Quirks

Quirk Usage User(s) Type
Absorption and Release Absorption and release Four-Eyed Nomu Emitter
Attraction of Small Objects Attraction thumb Inko Midoriya Emitter
Hekiji Tengai's Quirk Barrier Hekiji Tengai Emitter
Chart Chart Kashiko Sekigai Emitter
Cremation Dabi attacks Eraser Head Dabi Emitter
Flash Bang Sweat Flash Bang Sweat Dadan Tadan Emitter
Muscle Enlargement Muscle enlargement anime Four-Eyed Nomu Transformation
Paralysis Paralysis Habuko Mongoose Emitter
Ryuko Tatsuma's Quirk Ryuku Dragon Form Ryuko Tatsuma Transformation
Sajin Higawara's Quirk Sand Quirk Sajin Higawara Transformation
Sleep Gas Sleep Gas Mustard Emitter
Sludge Form Sludge Form Sludge Villain Mutant
Storage Storage High-End Emitter
Tongue Web Tongue web anime Four-Eyed Nomu Transformation
Tool Arms Tool Arms Chainsaw Nomu Transformation
Ushi Controlling Horn Cowcow Boy CowCow Boy Mutant
Wings Flying Nomu Winged Nomu Mutant

List of Non-Canon Quirks

Quirk Usage User(s) Type
Brown Bear Bearhead Portrait Bearhead Mutant
Cleaning NoPicAvailable Zookeeper Emitter
Dust Konako Haizono profile Dusty Ash Emitter
Eruption Maguma Iwata profile Volcano Emitter
Eye-brows Eye brows Unnamed Criminal Mutant
Fan Tsumuji Kazetani profile Gust Boy Mutant
Hedgehog Hedgehog Unknown Criminal Mutant
Good Face Good Face Unknown Villain Emitter
Sacred Tears Sacred tears Unnamed student Emitter
Whale Whale Curator Transformation
Zombie Virus Zombie Virus Romero Fujimi Emitter

References

  1. 1.0 1.1 My Hero Academia Manga: Chapter 166 (p. 6).
  2. 2.0 2.1 My Hero Academia Manga: Chapter 1 (p. 4).
  3. My Hero Academia Manga: Chapter 193.
  4. My Hero Academia Manga: Chapter 56 (p. 15).
  5. My Hero Academia Manga: Chapter 1 (p. 19).
  6. My Hero Academia Manga: Chapter 66 (p. 12).
  7. My Hero Academia Manga: Vol. 3, Omake
  8. My Hero Academia Manga: Chapter 59 (p. 11).
  9. My Hero Academia Manga: Chapter 22 (p. 4).
  10. My Hero Academia Manga: Chapter 70 (p. 7).
  11. My Hero Academia Manga: Vol. 9, Omake

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