Yoichi Shigaraki

Yoichi Shigaraki was the younger brother of All For One, and the first user of the Quirk One For All.

He was presumed to be Quirkless 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 merger 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 Tomura Shigaraki, reaching to about his shoulders, and his bangs usually obscures his bright green eyes, given him a rather creepy look.

From what it can see in the flashbacks, he used to dress in simple clothes, wearing a shirt and dark pants.

Personality
Despite his weak body, he 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 to continued to oppose his extremely powerful brother, even with his weak and fragile constitution.

Abilities
Mental Fortitude: Yoichi had a strong sense of justice and was willing to stand against his evil older brother, despite his brother amassing a 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 brothers evil.

Quirks
Unnamed Transference Quirk: Yoichi's Quirk allowed him to transfer his Quirk to another person. Aside from this, the Quirk itself had no other ability and appeared to lay inactive, leading to the belief that Yoichi was Quirkless.

Unnamed Stockpiling Quirk: Under the false pretense that his brother was Quirkless, All For One forcefully gave his brother a Quirk that allowed him to stockpile power. All For One stated that it was a Quirk that even his weak body could handle.

One For All (ワン・フォー・オール): When All For One forcefully implanted a power stockpiling Quirk within him, it merged with his own Quirk, giving rise to One for All. Due to his sickly state, he was unable to make use of the stockpiling effect, instead deciding to pass it on to other people in hopes of his new Quirk getting stronger over time.

Chapter Appearances

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Anime Appearances

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Trivia

 * Yoichi's surname contains the kanji for "death" (死), "handle, grip" (柄) and "tree" (木), while his first name contains "giving" (与) and "one" (一), a reference to Yoichi being the first wielder of One For All.
 * Yoichi's English voice actor, Stephen Fu, also voices Seiji Shishikura.