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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 vowing that he will stop his brother in "Vestiges"

Yoichi Shigaraki ( () (がら) () () (いち) Shigaraki Yoichi?)[1] was the younger brother of All For One, as well as the first user and originator of the One For All Quirk.

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 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.

From what it can see in the flashbacks, he used to dress 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 to continued 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, and often voices his support for the younger hero.

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.

Quirks

One For All (ワン・フォー・オール Wan Fō Ōru?): When All For One forcibly implanted a power stockpiling Quirk within him, it merged with his own Quirk, which had no other power than that it could be transferred to someone else, creating One for All. Due to his sickly state, he was unable to make good use of the stockpiling power and instead decided to pass it on to other people in hopes that his new Quirk would get stronger over time.

  • Unnamed Transference Quirk: Yoichi's original Quirk allowed him to willingly transfer the Quirk itself to another person through DNA. Aside from this, the Quirk itself had no other ability and appeared to lay inactive, leading to the belief that Yoichi was Quirkless. This is the only Quirk that cannot be stolen by All For One. As Quirk factor types tend to run in families, it's likely that Yoichi's transference Quirk always had the ability to assimilate or absorb the Quirks it came into contact with through transference much like how his brother's Quirk could also take in multiple Quirks (though by directly and consciously stealing them). This what probably also allowed his Quirk to absorb and combine with the power stockpiling Quirk.
  • Unnamed Power Stockpiling Quirk: Under the false pretense that his brother was Quirkless, All For One forcibly gave his brother a Quirk that allowed him to stockpile power. All For One stated that it was a Quirk that even Yoichi's weak body could handle.

Chapter Appearances

Appearances
U.A. Sports Festival Arc
22. That's the Idea, Ochaco Absent
23. Roaring Sports Festival Absent
24. Mad Dash and Knockdown Absent
25. In Their Own Quirky Ways Absent
26. Chase Down the Leader Absent
27. Earth-Shatteringly Fateful Negotiations Absent
28. Strats, Strats, Strats Absent
29. Unaware Absent
30. Cavalry-Match Finale Absent
31. The Boy Born with Everything Absent
32. Smile, Prince of Nonsense Land! Absent
33. Shinso's Situation Shadow
34. Victory or Defeat Flashback
35. Battle On, Challengers! Absent
36. Bakugo vs. Uraraka Absent
37. Midoriya and Endeavor Absent
38. Todoroki vs. Midoriya Absent
39. Shoto Todoroki: Origin Absent
40. Emancipation Absent
41. Fight On, Ida Absent
42. Final-Match Time Absent
43. Todoroki vs. Bakugo Absent
44. Relaxing Day Off Absent
Vs. Hero Killer Arc
45. Time to Pick Some Names Absent
46. Bizarre! Gran Torino Appears Absent
47. Struggling Absent
48. Getting the Knack Absent
49. Midoriya and Shigaraki Absent
50. Kill 'Em Dead Absent
51. No, Knock It Off, Ida Absent
52. Hero Killer Stain vs. U.A. Students Absent
53. From Todoroki to Ida Absent
54. Re: Ingenium Absent
55. Conclusion?! Absent
56. Conclusion Absent
57. The Aftermath of Hero Killer Stain Absent
58. Internship's End Absent
59. Listen Up!! A Tale from the Past Flashback
Pro Hero Arc
184. Japanese Hero Billboard Chart Absent
185. Wing Hero: Hawks Absent
186. Endeavor and Hawks Absent
187. Flaming Roar! vs. Nomu: High-End Absent
188. Your Father, the Number One Hero Absent
189. Why He Gets Back Up Absent
190. His Start Absent
191. Dabi, Hawks, Endeavor Absent
192. The Todoroki Family Vision
193. Vestiges Vision
Joint Training Arc
194. Cold Skies over U.A. High! Vision
195. Clash! Class A vs. Class B! Absent
196. Make It Happen, Shinso!! Absent
197. Quaotic Quirkstravaganza Absent
198. Known Where You Stand when It Counts!! Absent
199. Operation New Improv Moves! Absent
200. Clever Commander! Absent
201. Foresight Absent
202. Match 3 Absent
203. Flexible! Juzo Honenuki! Absent
204. Tuning Up Absent
205. Detour Absent
206. Match 3 Conclusion Absent
207. Early Bird! Absent
208. Match 4 Conclusion Absent
209. Match 5 Start Mentioned
210. The One For All Dream Absent
211. That Which Is Inherited Absent
212. That Which Is Inherited, Part 2 Absent
213. Realm of Souls Vision
214. Our Brawl Absent
215. Final Face-Off! Midoriya vs. Shinso! Absent
216. Class A vs. Class B: Conclusion! Absent
217. The New Power and All For One Absent
Paranormal Liberation War Arc
253. Shirakumo Absent
254. More of a Hero than Anyone Absent
255. Hero Hopeful Absent
256. The High, Deep Blue Sky Absent
257. Pass It Forward, to Whomever Absent
258. Friends Absent
259. A Quiet Beginning Absent
260. Life's Work Absent
261. High-Ends Absent
262. Mirko, the No. 5 Hero Absent
263. I Wanna Be with You Guys!! Absent
264. One's Justice Absent
265. Villains and Heroes Absent
266. Happy Life Absent
267. Flames Absent
268. Scramble! Absent
269. The Three of Us Absent
270. Inheritance Absent
271. Dark Cloud Absent
272. Good Morning! Flashback
273. The Thrill of Destruction Absent
274. Search Absent
275. Encounter, Part 2 Absent
276. You Cheated...! Absent
277. Who...? Mentioned
278. Disaster Walker Absent
279. League of Villains vs. U.A. Students Absent
280. Red Riot, Part 3 Absent
281. Plus Ultra Absent
282. Footfall of Destruction Absent
283. 75 Absent
284. Deep Blue Battle Absent
285. Katsuki Bakugo Rising Mentioned
286. The Ones Within Us Absent
287. Mistake Vision
288. Save Takeo!! Absent
289. Miss Candid and Miss Shut-Away Absent
290. Dabi's Dance Absent
291. Thanks For Going Strong Absent
292. Threads of Hope Absent
293. Hero-Saturated Society Absent
294. Final Performance Absent
295. Tenacious Absent
296. Hellish Hell Absent
297. Tartarus Absent
298. Sounds of Collapse Absent
299. Like Those Tragic Tales Absent
300. The Hellish Todoroki Family, Part 2 Absent
301. The Wrong Way to Put Out a Fire, Part 1 Absent
302. The Wrong Way to Put Out a Fire, Part 2 Absent
303. Top Three Absent
304. Izuku Midoriya and Toshinori Yagi Debut
305. Izuku Midoriya and Tomura Shigaraki Appears
306. The Final Act Begins Absent
Villain Hunt Arc
307. Been a While!! Absent
308. Full Power!! Absent
309. Can't Be a Child Anymore Absent
310. Masters and Pupil Vision
311. Here We Go!! Mentioned
312. Hired Gun Absent
313. High-Speed Long-Range Mobile Cannon Absent
314. The Lovely Lady Nagant Absent
315. Platitudes Absent
316. Your Turn Absent
317. Scars, Blood, Filth Absent
318. Reckless Vision
319. Friend Absent
320. Deku vs. Class A Absent

Anime Appearances

Appearances
Season 2
14. That's the Idea, Ochaco Absent
15. Roaring Sports Festival Absent
16. In Their Own Quirky Ways Absent
17. Strategy, Strategy, Strategy Absent
18. Cavalry Battle Finale Absent
19. The Boy Born with Everything Absent
20. Victory or Defeat Shadow
21. Battle on, Challengers! Absent
22. Bakugo vs. Uraraka Absent
23. Shoto Todoroki: Origin Absent
24. Fight on, Ida Absent
25. Todoroki vs. Bakugo Absent
26. Time to Pick Some Names Absent
27. Bizarre! Gran Torino Appears Absent
28. Midoriya and Shigaraki Absent
29. Hero Killer: Stain vs U.A. Students Absent
30. Climax Absent
31. The Aftermath of Hero Killer: Stain Absent
32. Everyone's Internships Absent
33. Listen Up!! A Tale from the Past Flashback
34. Gear up for Final Exams Absent
35. Yaoyorozu: Rising Absent
36. Stripping the Varnish Absent
37. Katsuki Bakugo: Origin Absent
38. Encounter Absent
Season 4
64. The Scoop on U.A. Class 1-A Absent
65. Overhaul Absent
66. Boy Meets... Absent
67. Fighting Fate Absent
68. Let's Go, Gutsy Red Riot Flashback
69. An Unpleasant Talk Absent
70. GO!! Absent
71. Suneater of the Big Three Absent
72. Red Riot Absent
73. Temp Squad Absent
74. Lemillion Absent
75. Unforeseen Hope Absent
76. Infinite 100% Absent
77. Bright Future Absent
78. Smoldering Flames Absent
79. Win Those Kids' Hearts Absent
80. Relief for License Trainees Absent
81. School Festival Absent
82. Prepping for the School Festival Is the Funnest Part Absent
83. Gold Tips Imperial Absent
84. Deku vs. Gentle Criminal Absent
85. School Festival Start!! Absent
86. Let It Flow! School Festival! Absent
87. Japanese Hero Billboard Chart Absent
88. His Start Vision
Season 5
89. All Hands on Deck! Class 1-A Absent
90. Vestiges Vision
91. Clash! Class A vs. Class B! Flashback
92. Make It Happen, Shinso! Absent
93. Operation New Improv Moves Absent
94. Foresight Absent
95. Match 3 Flashback
96. Match 3 Conclusion Absent
97. Early Bird! Absent
98. That Which Is Inherited Flashback
99. Our Brawl Absent
100. The New Power and All For One Absent
101. Have a Merry Christmas! Absent
102. Off to Endeavor's Agency! Absent
103. One Thing at a Time Absent
104. Long Time No See, Selkie Absent
105. The Hellish Todoroki Family Absent

Trivia

  • Yoichi's surname contains the kanji for "death" ( shi?), "handle, grip" ( gara?) and "tree" ( ki?), while his first name contains "giving" ( yo?) and "one" ( ichi?), a reference to Yoichi being the first wielder of One For All.
  • Yoichi's English voice actor, Stephen Fu, also voices Seiji Shishikura.

References

  1. My Hero Academia Manga: Chapter 310 (p. 15).