Yoichi Shigaraki (Earth 1)

## Yoichi Shigaraki

> The Demon Lord did conquer the world, yes. But the hero fighting for justice struggled past the pain and managed to save everyone. Get it, brother? The villain always loses in the end!
>
> **Yoichi Shigaraki** to All For One in "Vestiges"

**Yoichi Shigaraki** (死 (し) 柄 (がら) 木 (き) 与 (よ) 一 (いち) , *Shigaraki Yoichi*?) was the younger brother of All For One, as well as the first hosts of the One For All.

He was presumed to be Human and could only watch as his brother committed atrocities. When his brother decided to forcefully implant a Quirk within him, it was discovered that he really did have a Quirk, one with no other power than that it could be transferred to others. The merging of the two Quirks resulted in the creation of "One For All".

Due to being physically weak, he was unable to make effective use of his new power. So instead, he decided to pass this Quirk down to his successor, hoping one day it will grow strong enough to stop his brother.

## Appearance

Yoichi was a young man with a sickly and malnourished appearance and a weak body. He had white, messy hair, similar to that of Tomura Shigaraki. His hair reached to about his shoulders, and his bangs usually obscured his bright green eyes, which gave him a sinister appearance not consistent with his benevolent personality.

During his lifetime, he dressed in simple clothes, wearing a white shirt and dark pants. He would occasionally be seen wearing a light blue jacket.

## Personality

Despite his weak body, Yoichi was recognized for having a strong sense of justice, which came into direct conflict with the ambition and megalomania of his older brother. This feeling made him refuse to submit to All For One, despite his constant attempts to convince him to desist from his ridiculous idealism.

He had strong willpower, which allowed him to continue to oppose his extremely powerful brother, even with his weak and fragile constitution. Aside from his strained relationship with his brother, Yoichi is a friendly person, and has a good relationship with all his successors. He holds Izuku Midoriya in high regard, impressed by his conviction to help people in distress, even his enemies, and often voices his support for the younger hero. He also brought the second and third users of One For All to Izuku's side, despite them both initially refusing to acknowledge him, reminding them both on how they once sought to kill him for his connection to All For One, only to save Yoichi instead while calling them both his heroes.

## Powers and Abilities

### Powers

**Meta-human Physiology:** Yoichi

* **Accelerated Regenerative Healing Factor:** Yoichi has the power to heal himself from injuries ranging from small cuts to third-degree burns. The power to increase the speed of one’s regenerative abilities each time one is damaged. Daigoro increased the rate and speed of his Regenerative Healing Factor as the result of the level of punishment sustained. This means that each time Daigoro is wounded and healed, this will make the speed of regeneration faster than before and will get faster each time Daigoro is wounded and healed.
	+ **Healing Blood:** Yoichi has blood that is heavily enriched with regenerative properties, which can keep himself constantly healed and in optimal health as long as his blood keeps flowing within.
	By transfusing his blood to another, it can help boost the recipient's healing process. If given at large amounts, it can potentially permanently infuse the recipient with the power of regeneration.
	+ **Contaminant Immunity:** Yoichi is immune to poisons, toxins, venoms, viruses, bacteria, parasites, pathogens, allergen, etc.
	+ **Immortality:** Yoichi possesses Immortality, a state where he has eternal life and is undying. He never age, is completely self-sustaining, free from all bodily necessities, and can survive virtually any kind of harm, remaining immune to all forms of decay. Any damage done to Yoichi would either be regenerated or simply remain non-fatal. As a byproduct of having everlasting life, Yoichi may have an infinite reservoir of life energy that fuels the dynamic system of his immortality.
* **Cellular Activation:** Yoichi can activate cells within an organism's body, stimulating cellular functions, increasing physical attributes such as speed and healing, or maybe accelerating them with enough speed and energy to produce heat, destroying them. It can also be used offensively on targets by causing unnatural cell activation, causing cancer. The activation of cells can cause a temporary optimization, making the affected looking younger.
	+ **Accelerating Regeneration:** Yoichi increases the rate and speed of his Regenerative Healing Factor as the result of the level of punishment sustained. This means that each time Yoichi is wounded and healed, this will make the speed of regeneration faster than before, and will get faster each time Yoichi is wounded and healed.
	+ **Bodily Attribute Augmentation:** Yoichi can selectively augment bodily attributes, enhancing muscle mass, increasing body size, amplifying immunity system, etc.
	+ **Cancer Inducement:** Yoichi can induce cancer and any kind of cancerous tumor or growth.
	+ **Cellular Disintegration:** Yoichi can dissolve any sort of organic cells, including plant, bone, or even fertile dirt and dissolve them, destroying them at a cellular or even protein level, allowing them to destroy their targets, either by a specific part or outright disintegration. He can also dissolve viral or germ-like cells & pathogens from his own body for self-treatment.
	Yoichi can even overpower all forms of cellular regeneration by disintegrating cells continuously, overwhelming and negating the healing process until there is nothing to regenerate from.
	+ **Healing:** Yoichi can Heal themselves and restore biotic organisms to their optimal health, curing damaged or withered organisms, wounds, broken bones, low vitality, and diseases/poisoning. Though Yoichi may potentially heal any form of bodily damage, the patient must be alive, even if hanging by a thin thread, in order to be healed; once the patient has died, it would transcend healing and would require resurrection instead.
		- **Healing Augmentation:** Yoichi can enhance, augment, increase and multiply the regenerative/healing process and/or the healing powers of oneself and/or others.
		- **Mental Healing:** Yoichi can heal mental illnesses, disorders, and other forms of mental trauma, to their healthy state and reverse the effects of mental tampering, such as mind control or memory loss.
	+ **Mitosis Manipulation:** Yoichi can manipulate mitosis, the division and replication of cells in himself or others, allowing him to speed up, slow down, concentrate, make efficient, halt, and reverse mitosis. This allows him to rapidly regenerate as well as harm others by undoing their mitosis or stop people who shapeshift by mitosis.
	Yoichi can make mitosis more efficient to heal wounds in seconds or slow the aging process down. By reversing mitosis on cancerous cells, he can effectively prevent its spread, and even remove it.
		- **Age Shifting:** Yoichi can either accelerate or reverse the aging process in himself or others. Yoichi can also accelerate or reverse the aging process in objects.
			* **Telomere Reduction:** Yoichi is able to reduce the length of telomeres, either his own or others. Telomeres are a region of repetitive nucleotide sequences at each end of a chromatid, protecting the DNA fragments; they grow shorter as cell division occurs, an indication of the person getting older. By shortening the telomeres, one can reduce the lifespan of themselves or others.
				+ **Age Acceleration:** Yoichi can accelerate the age of himself and others/objects with varying speeds/rates, as in, for example, age 2 years in one year, 5 in 3 years, 10 years in a day or even a year every 30 minutes. Yoichi can make the aging automatic, so the victim ages at a rapid rate. If used offensively, Yoichi can make beings and objects age to death, leaving nothing but dust. Because everything is subject to aging, this power could be used to destroy everything. The target may also be aged mentally to the point of senility.
				Alternatively, Yoichi could make others who wish to be older (like a kid who wishes to be a teenager and a teenager who wishes to be an adult) but unless the user can reverse the process, the changes are permanent.
			* **Telomere Regeneration:** Yoichi can regenerate the length of their telomeres. Telomeres are a region of repetitive nucleotide sequences at each end of a chromatid, protecting the DNA fragments; they grow shorter as cell division occurs, an indication of the person getting older. By regenerating the lengths of telomeres, one can extend their own lifespan indefinitely.
				+ **Youth Inducement:** Yoichi can make himself and/or others age in reverse ergo making them younger. Some make them age backwards the same rate as they did forwards, and some can make them age backwards very quickly by going about a year per second back. Some can put them on an automatic aging process making them become younger and younger at a certain speed until they go from children to toddlers to babies to fetuses to sperm to not existing. Some can recover their original age and revert them to their real age.
	+ **Regeneration Regulation:** Yoichi can regulate/control their own healing/regeneration process, speeding up or slowing down the process, and even potentially advancing it to allow such things as regeneration/reattachment of severed limbs.
		- **Regrowth:** Yoichi can regrow his body parts, such as limbs and organs, of himself and others that were separated from their body, and may even survive decapitation by growing a new head.

### Cosmic Entity Avatar

**One For All Avatar** *(ワン・フォー・オール, *Wan Fō Ōru*?)*: **When Yoichi was child he had merged with dominant Cosmic Entity that he later know as One For All. Due to his initial sickly state as a child, he was unable to make good use of the stockpiling power.**

* **Power Stockpiling:** One For All stockpiles the raw power of all it hosts convert it into super strength, superspeed, super stamina, superagility and durability.
	+ **Superhuman Strength:**
	+ **Superhuman Speed:**
	+ **Superhuman Stamina:**
	+ **Superhuman Agility:**
	+ **Superhuman Durability:**
* **Transformation:**
	+ **Transformation Mastery:** OFA Hosts can control has mastery over all transformations they wield.
		- **Bold:**
	+ **Aquatic Transformation:**
		- **Aquatic Adaptation:**
			* **Aquatic Breathing**
			* **Speed Swimming:**
			* **Underwater Invulnerability:**
			* **Underwater Senses:**
			* **Gill Manifestation:**
			* **Webbed Digits:**
			* **Water Pressure Immunity:**
			* **Aquatic Breathing:**
			* **Cold Resistance:**
			* **Underwater Strength:**
	+ **Beast Transformation:**
		- **Feral Mind:**
		- **Enhanced Condition:**
			* **Enhanced Strength:**
			* **Enhanced Speed:**
			* **Enhanced Senses:**
			* **Enhanced Durability:**
		- **Unnatural Size:** The user may be larger in beast mode
	+ **Titan Transformation:**
		- **Sharpened Fangs:**
		- **Unbreakable Teeth:**
		- **Retractable Metal Teeth:**
		- **Sharp Teeth:**
		- **Multi-hinged Jaws:**
		- **Elastic Jaws:**
		- **Hardening:**
		- **Armored Skin:**
* **Scanning:** The user can scan anything and analyze the data and information that is gathered.
	+ **Indexing:** Any and all data and information that is gathered remains after
	+ **Body Language Analysis:**
	+ **Vital Scanning:**
	+ **Power Perception:** The power to perceive and detect one's stats and powers.
		- **Ability Intuition:** The ability to gain an intuitive understanding and mastery of one's abilities.
		- **Power Detection:** The power to gain insight into the presence of supernatural powers of an individual.
		- **Power Level Measuring:** The power to measure the mental and physical strength levels of their targets.
		- **Weakness Detection:** Sense weak points.
	+ **Threat Identification:** The power to identify a threat to anyone/anything by certain designations.
* **Tracking:** The power to
* **Omni-Communication:**
	+ **Alternative Communication:**
	+ **Communication Shift:**
	+ **Omnilingualism:**
		- **Body Language Analysis:**
		- **Cyberlingualism:**
		- **Linguistics Mastery:**
		- **Projective Omnilingualism:**
		- **Xenolingualism:**
		- **Zoolingualism:**
			* **Dragon Communication:**

### Abilities

* **Mental Fortitude:** Yoichi had a strong sense of justice and was willing to stand against his evil older brother, despite his own weak body and his brother amassing a large collection of powerful Quirks and loyal followers. Even after All For One forced a Quirk on him and locked him up, Yoichi still longed to rid the world of his brother's evil. Several decades later, when All For One and Tomura Shigaraki tried to steal One For All from Izuku, Yoichi and Nana resisted them in the vestige world. Even Tomura Shigaraki was stunned by Yoichi's willpower, which expelled the villains from the vestige world, thwarting their attempt to steal One For All.

## Trivia and Notes

### Trivia

* Yoichi's surname contains the kanji for "death" (死, *shi*?), "handle, grip" (柄, *gara*?) and "tree" (木, *ki*?), while his first name contains "giving" (与, *yo*?) and "one" (一, *ichi*?), a reference to Yoichi being the first wielder of One For All.