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 backwards 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 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 opponent, 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, one that functions better as a restraining tool, giving Yosetsu a way to incapacitate enemies by harmlessly binding them to nearby structures. Yosetsu can 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. He 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.



Yosetsu fusing a tracking device to a Nomu.

Weld (溶接 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


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


  • 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 Official Character Book Ultra Archive (p. 93).
  7. My Hero Academia Official Character Book 2 Ultra Analysis.

Site Navigation

*Disclosure: Some of the links above are affiliate links, meaning, at no additional cost to you, Fandom will earn a commission if you click through and make a purchase. Community content is available under CC-BY-SA unless otherwise noted.

Fandom may earn an affiliate commission on sales made from links on this page.

Stream the best stories.

Fandom may earn an affiliate commission on sales made from links on this page.

Get Disney+