Affinity

## History

 File:Luminescent Baby (Anime).png  The first ever person in the world to manifest a Power was a newborn baby in Qing Qing City, China; the baby had the ability to emanate light from their body.

After that phenomenon, many people around the world began to manifest different kinds of superpowers. While the cause of the Power phenomenon is unknown, it has been theorized that the development of Powers was caused by the spread of a virus carried by mice. These superpowers were first referred to as Meta Abilities before later being called Powers.Template:RefTemplate:Ref

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" and ordinary people being prejudiced against the Power users.

 File:Dawn of Vigilantes.png  As chaos and unrest ensued due to the outbreak of Powers, ordinary civilians with their own Powers decided to take matters into their own hands to bring order to society and thus the first "Heroes" appeared in the form of Vigilantes and thus beginning the Vigilantes Era.Template:Ref/Vigilantes

During this time period, All For One became a symbol of unity in society. He used his Power to remove Powers from those who did not want them and give Powers to those that did. His actions under the guise of returning society to its prior state of humanity, when in reality, he was gathering followers who were loyal to him, allowing him to act out his ulterior motives.Template:Ref

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 Powers as weapons. To fill that void, the profession of crime-fighting Power users, Pro Heroes, began to exist which caused the Vigilantes to slowly disappear. 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.Template:Ref However, some members of society were not happy with the governments' regulations on Power usage as they believed that the free use of their superhuman abilities should be a basic human right.Template:Ref

A group of Power users known as the Meta Liberation Army, led by Destro, had tried to stop the passing of regulations that would restrict Power usage. They rebelled against the governments of a number of nations for several years before ultimately suffering defeat.Template:Ref

Currently, roughly 80% of the people who make up the global population possess a Power.Template:Ref

## Information

Powers are said to be the next stage of evolution in the human race. It is possible to diagnose a person as possessing or lacking a Power by analyzing the presence or absence of an extra joint in their pinky toe. People with only one joint will develop a Power while having two joints indicates that the person is Powerless.Template:Ref

A person's Power will normally manifest around the age of four years old, although, it is possible for a child to be born with their Powers already manifested, such was the case with Present MicTemplate:Ref and the very first person to manifest a Power, the Luminescent Baby.Template:Ref

 File:Shoto frostbite.png  Although easy to forget, the fact is that Powers are physical abilities. As such, they can be trained and worn out. When a person works out their muscles, the muscle fibers are destroyed and new, stronger ones grow back; this same rule applies to Powers. However, should a Power be overused, the user could suffer any of a variety of drawbacks, depending on the nature of the Power. These drawbacks are usually simple ailments, such as dry skin or nausea; however, in some cases, the drawback can be much more severe.

There are also instances where a Power doesn't suit the user's body and the body can't handle it. Some people, such as Yuga Aoyama, suffer from birth defects that cause the victim to have difficulties controlling their Power. Such conditions can be bypassed through the use of support equipment, such as Yuga's belt. Similarly, Nine suffers from chronic pain and cellular degeneration due to the massive strain of his Power, Weather Manipulation.

Power levels can be measured, though only Toshinori Yagi's have ever been shown, being at 15,000 AP at his peak and reaching a low point of 2,500 AP in the present.Template:Ref

Although very rare, it is also possible for animals to possess Powers, such as Nezu having a Power that gives him above-human intelligence.Template:Ref

Every Power contains an echo of the consciousness of its wielder; if a person's Power is transferred to someone else, the consciousness of the previous wielder will appear in the new user's mind, either as voices in dreams or manifestations in a mental mindscape. If further transferred to yet another new user, then that new user will experience the consciousnesses of all of the previous users. Though, these consciousnesses will disappear if the new user loses the transferred Power.Template:Ref

### Power Factor

The term "Power Factor"「個性因子 , *Kosei Inshi*, literally meaning: lit. "Individuality Factor"」 refers to the collective physical and genetic traits that compose a person's Power. This includes the primary Power power as well as all the biological mechanisms that allow said primary power to function properly. Power Factors also contain a person's consciousness.Template:Ref

Under special circumstances, a second Power can be added to a person's genetics. However, gaining multiple Powers often puts immense strain on the inheritor, rendering them as mindless living dolls incapable of speaking. A person can tolerate two Powers at most, should they be physically fit, as in the case of One For All users. Presently, there are only four known people alive who can wield multiple Powers without suffering from the Power overload. There is a rare chance that the two Powers may merge, becoming a new Power, as was the case with One For All.Template:Ref

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

The first instance was when Eraser Head was severely injured by the U.S.J. Nomu. Eraser Head’s body sustained a large amount of damage, especially his face and head, and this caused his Erasure Power to have a much shorter time limit, as he has to blink more often because of the damage he took.

### Heredity

 File:Power Lineage.png  Powers are inherited genetically through what appears to be Mendelian inheritance. A child will either inherit the father's Power, the mother's Power, or a new composite Power formed by a fusion of the two. This composite Power may sometimes give the appearance of the person having two separate Powers, such as Shoto Todoroki's Half-Cold Half-Hot.

Much more rarely, in the case of Eri's Rewind and Tomura Shigaraki's Decay, a child may manifest a Power that is entirely unrelated to their genetic lineage, akin to a mutation.

Physical abnormalities caused by Powers can be passed on to the next generation, even if the Power that causes the abnormality is not passed on; Fumikage Tokoyami has a bird-like head that has nothing to do with his shadow monster Power, Koji Koda has a jagged, rock-like head that has nothing to do with his power to talk to animals, and Mina Ashido has a pair of horns and eyes with black sclera instead of white, that has nothing to do with her power to produce acid.

There is also a possibility that two people with Powers will have a Powerless child, such was the case with Izuku Midoriya.

#### Power Marriage

Since Powers are passed on from parent to child, some people choose a marriage partner based on their Power. This is what's known as a Power Marriage.

The idea is for the child to have a powerful Power that combines the parents' Powers. A popular example of this is Shoto Todoroki and his Power, Half-Cold Half-Hot which is a combination of his father's Power, Hellflame and his mother, Rei Todoroki's ice Power. Powerful combinations are not guaranteed, even from strong parents - Shoto was the only one of four siblings to have a powerful combination of the parental quirks without downsides.

### Power Frequency

Some Powers are very common, in that many people possess Powers that fall in that particular classification. Known classifications of common Powers include:

* **Gigantification:** Powers that allow the user to increase the size of ones self.

Other Powers are very rare, in that not many people possess Powers of that nature. Known classifications of "Rare Powers" include:

* **Warping**: Powers that allow the user to teleport themselves, other people, and/or objects to a different location.
* **Regeneration**: Powers that allow the user to heal from severe damage quickly.

### Awakening

After initial Power manifestation, it is possible for the user to undergo an "Awakening". The right catalyst can cause Powers to evolve on the spot.Template:Ref This results in ones Power gaining a new level of strength and/or new aspects to its nature that were previously not possible.

An example of this phenomenon is demonstrated when Himiko Toga's disguise Power evolved in a life-or-death situation, giving her the ability to duplicate the Powers of the people she transformed into, shown when she used Zero Gravity while she had taken the form of Ochaco Uraraka.Template:Ref It is also said that Geten's Power evolved when Re-Destro burned himself, from solely the manipulation of ice to being also able to change its temperature.Template:Ref

### Power Singularity

 File:Episode 79.png  The theory of "Power Singularity" is a popular line of thinking that suggests that Powers will continue to mix together and deepen, growing in both strength and complexity with every new generation. Eventually, Powers will develop to a point where no one will be able to control them anymore.Template:Ref

This idea was first theorized by Kyudai Garaki, who started to see early signs of this phenomenon among the fourth generation of Power users. However, with the exception of All For One, no one believed his theory, and he was ostracized from society as a result.Template:Ref

This theory is first mentioned by Seiji Shishikura when Present Mic notes how the Masegaki Primary School students have very powerful Powers and have much better control over them than he did at that age.

As mentioned by Present Mic, in the current era, this theory is viewed as fringe thinking, and is followed by some cultists.Template:Ref

### Power Restriction Laws

In an effort to preserve order in the superhuman society, there are several laws and procedures in place to ensure the conscientious use of Powers. Public display of Powers is against the law,Template:Ref except in cases of self-defense, such as when one is under attack or preventing someone else from being attacked.Template:Ref

During elementary school, children receive Power counseling in order to learn how to use their powers responsibly.Template:Ref

Aspiring Pro Heroes undergo special education during their high school careers and receive licenses that give them the authority to use their Powers freely.

## Power Types

### Known Power Sub-Types

#### Accumulation

Accumulation-type Power's are powers that, in order to function properly, require the user accumulate something ahead of time, such as power, energy, mass, or a particular resource. Some such Powers are One For All, Stress, Rewind, and Fat Absorption.Template:Ref

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