If we lose the initiative in this fight, we’re dead meat.
Yosetsu Awase to his teammates in "Early Bird!"

Yosetsu Awase ( (あわ) () (よう) (せつ) Awase Yōsetsu?), also known as Welder (ウェルダー Werudā?),[1] is a student in Class 1-B at U.A. High School, training to become a Pro Hero.


Yosetsu has long black hair, spiked upwards and backward to his left, and rounded gray eyes, tilted inwards. He wears a wide, zig-zag patterned headband around his forehead, pulled down quite low, to keep his hair out of his eyes.

His hero costume consists of a burgundy, baggy, full body suit, its collar passing his chin. He wears shoulder pads and a bag on his belt in which he keeps various items, including blocks of wood and metal to aid his Quirk. He also switches out his usual zig-zagged headband for a striped one.


Although he is not as social as some others, Yosetsu is foul-mouthed and tense, except for serious or life-or-death situations, in which he becomes very easily startled and much more talkative, although he retains his harsh way of speech.[2]

Yosetsu is very selfless, as he continued to carry Momo Yaoyorozu even though the Chainsaw Nomu was catching up with him, refusing to leave her behind despite her slowing him down. He is also willing to put himself in danger to fulfill a plan, despite showing fear.

He is also said to be very proud of his Quirk and confident in his abilities with it.


Yosetsu combines his stealth skills with his Quirk handling to effectively subdue the powerful Katsuki Bakugo.

Overall Abilities: Yosetsu has proven himself to be a very competent combatant, as abilities earned him 10th place in the U.A. Entrance Exam, having the third highest of amount of villain points. He has also demonstrated excellent handling of Quirk Weld, a power that functions better as a restraining tool, giving Yosetsu a way to incapacitate enemies by harmlessly binding them to nearby structures. Yosetsu can even fuse his own body parts with those of other people, facilitating their transport in case they become unable to move. He also possesses stealth capabilities, successfully hiding from his opponents’ view(s) before surprising them with his Quirk abilities. Yosetsu was not only successful in discreetly attaching a tracking device, created by Momo Yaoyorozu, onto the Chainsaw Nomu, but was also capable of effectively ambushing and restraining Katsuki Bakugo, one of the strongest students in Class 1-A.


Weld ( (よう) (せつ) Yōsetsu?): Yosetsu's Quirk gives him the ability to fuse objects together at an atomic level, although he needs to be touching both objects in order to fuse them.[3] This Quirk is effective on both organic and inorganic material.

Super Moves

  • Construction-Done-Kwik: Weldcraft ( (はや) (わざ) (ちゃっ) (こう) ウェルドクラフト Hayawaza Chakkō Werudokurafuto?): Yosetsu swiftly binds an opponent to a structure by interconnecting them with metallic logs. First used to detain Katsuki during the Joint Training Arc, but was countered by Rikido's Sugar Rush Quirk.[4]


2/6 D
4/6 B-
5/6 A
4/6 B+
Ability to Stop You In Your Tracks
4/6 B
Yosetsu's stats, according to the Ultra Analysis Book


Steel Logs: Yosetsu's hero costume comes equipped with a set of small steel logs that are used with his binding abilities. Those logs allow him to connect two different targets without having to touch both of them at the same time (Yosetsu can fuse each end of a log to separate targets, bridging them together).

Shields: Yosetsu possesses a number of shields that he attaches to his body, effectively turning them into armor for defense.

Battles & Events

Battles & Events

Chapter 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 Debut
27. Earth-Shatteringly Fateful Negotiations Appears
28. Strats, Strats, Strats Appears
29. Unaware Absent
30. Cavalry-Match Finale Appears
31. The Boy Born with Everything Absent
32. Smile, Prince of Nonsense Land! Appears
33. Shinso's Situation Absent
34. Victory or Defeat Absent
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 Appears
Forest Training Camp Arc
70. Wild, Wild, Pussycats Absent
71. Kota Absent
72. Day Two Appears
73. Good Evening Absent
74. Smoke Signal Appears
75. Stake Your Life, Hero! Pictured
76. My Hero Absent
77. It's Okay Appears
78. Whirling Chaos Absent
79. Drive It Home, Iron Fist!!! Absent
80. Establishing the Bakugo Bodyguard Brigade Absent
81. Roaring Upheaval Appears
82. What a Twist! Absent
83. Loss Appears
U.A. School Festival Arc
169. School Festival Absent
170. With Eri Absent
171. Gentle and La Brava Absent
172. Prepping for the School Festival Is the Funnest Part (Part 1) Absent
173. Prepping for the School Festival Is the Funnest Part (Part 2) Appears
174. Golden Tips Imperial Absent
175. Morning, the Day Of Flashback
176. Deku vs. Gentle Criminal Absent
177. At the Construction Site Absent
178. The Woman Called La Brava Appears
179. School Festival Start!! Absent
180. Unbeknownst Absent
181. For Someone Else Absent
182. Let It Flow! School Festival! Absent
183. Festival All Day Long!! Appears
Joint Training Arc
194. Cold Skies over U.A. High! Appears
195. Clash! Class A vs. Class B! Appears
196. Make It Happen, Shinso!! Absent
197. Quaotic Quirkstravaganza Appears
198. Known Where You Stand when It Counts!! Appears
199. Operation New Improv Moves! Appears
200. Clever Commander! Appears
201. Foresight Absent
202. Match 3 Absent
203. Flexible! Juzo Honenuki! Absent
204. Tuning Up Absent
205. Detour Absent
206. Match 3 Conclusion Appears
207. Early Bird! Appears
208. Match 4 Conclusion Appears
209. Match 5 Start Appears
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 Absent
214. Our Brawl Absent
215. Final Face-Off! Midoriya vs. Shinso! Absent
216. Class A vs. Class B: Conclusion! Appears
217. The New Power and All For One Absent
Endeavor Agency Arc
241. Do That Interview! Absent
242. Have a Merry Christmas! Absent
243. Off to Endeavor's Agency! Absent
244. Recommended Reading Absent
245. Rise to Action Absent
246. Message Appears
247. Status Report! Absent
248. One Thing at a Time Absent
249. The Hellish Todoroki Family Absent
250. Ending Absent
251. Just One Week Absent
252. The Unforgiven Absent


  • Yosetsu's surname contains the kanji for "bubble" ( awa?), "torrent, rapids" ( se?), and his first name contains "ocean" ( ?) and "snow" ( setsu?).
    • His name is homophonous with the Japanese words for "weld" (溶接 yōsetsu?) and "joint together" (合わせ awase?).
  • Yosetsu ranked 10th during the U.A. Entrance Exam with 50 Villain Points and 6 Rescue Points.[5]
  • Yosetsu likes mobile games.[6]
  • Yosetsu has a small crush on Momo Yaoyorozu.[7]
  • Yosetsu shares his birthday with Snipe.


  1. My Hero Academia Manga: Vol. 22.
  2. My Hero Academia Manga: Chapter 81.
  3. My Hero Academia Manga: Chapter 81 (p. 11).
  4. My Hero Academia Manga: Chapter 208.
  5. My Hero Academia Anime: Episode 5.
  6. My Hero Academia: Ultra Archive: The Official Character Guide (p. 93).
  7. My Hero Academia: Ultra Analysis: The Official Character Guide.

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