What is Yosetsu Awase's Quirk in My Hero Academia? Explained

In the My Hero Academia world, most of the population has a superpower known as Quirks. If anyone wants to be a hero, they can do so by getting an official license — that is why aspiring kids enroll in schools to get their training. The most prestigious institute among them all is U.A High, and one such underrated yet highly tactical hero-in-training is Yosetsu Awase of Class 1-B.

Yosetsu’s Quirk is known as Weld in My Hero Academia. At first glance, Weld might sound like a construction tool rather than a superhero ability. But in reality, it is one of the more scientifically plausible and ingenious Quirks in My Hero Academia.

Weld allows Yosetsu to fuse any two objects together at the atomic level. It could be either an organic or an inorganic item. The only condition is that he needs to be touching both of them. Basically, the way this quirk works is that Weld gives Yosetsu the ability to molecularly bond materials. It effectively creates permanent or semi-permanent fusions between whatever he touches.

The fusion is so strong that even powerful characters like Katsuki Bakugo had to rely on outside help to break free. He doesn't need to understand the scientific structure of materials because his Quirk handles the chemistry for him. What is important is physical contact. He must be touching both targets at the time of fusion, which adds both strategic limitations and opportunities.

His character in My Hero Academia has a signature ultimate move, and he calls it Construction-Done-Kwik: Weldcraft. This signature move is Yosetsu’s crowning example of precision and battlefield control. Used most memorably during the Joint Training Battle between Class 1-A and Class 1-B, Weldcraft sees Yosetsu using small steel logs to quickly bind an enemy to the environment.

In this move, he doesn’t just grab his opponent and pin them — he tactically positions the metallic rods between the opponent and a nearby structure, then uses Weld to fuse both ends instantly. It is fast, seamless, and incredibly difficult to counter if the opponent is caught off guard.

He successfully captured Bakugo with this move, proving that even the most aggressive fighters can be shut down when Weld is used correctly. Unfortunately, Rikido Sato’s Sugar Rush Quirk allowed him to break the fusion and save Bakugo, showing that while powerful, Weld can be overcome with raw force.

Moreover, his ability to hide, ambush, and disable stronger enemies makes him invaluable in team battles, stealth operations, and hostage situations. The fact that he ranked 10th in the U.A. Entrance Exam — placing higher than many Class 1-A students is proof that his combat instincts and Quirk usage are nothing to scoff at.

Why is Weld more powerful than you think in My Hero Academia?

In a world filled with elemental powers, explosions, and teleportation, Weld might seem unimpressive. But let's consider its real potential:

1) Restraint and Capture: Weld can neutralize opponents without injuring them, essential for hostage or civilian-heavy missions.

2) Support in Emergencies: Yosetsu can fix structures, stabilize environments, or even carry injured people by fusing them safely to him.

3) Tracking and Espionage: Welding devices to targets for tracking or surveillance? Check.

4) Armor Enhancement: Weld can modify and enhance gear mid-battle.

It’s not about raw power — rather, it is about utility. And in a team setting, having someone with this Quirk in My Hero Academia becomes a huge advantage.

Final thoughts

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Yosetsu Awase might not be part of the main cast in My Hero Academia, but he is still formidable. His Quirk, Weld, proves that creativity, intelligence, and teamwork are just as vital as brute force.

He might be behind the scenes more often than not, but when he steps into the spotlight, he always leaves an impression. And in a world where so many heroes lose sight of what matters, Yosetsu's actions remind us that sometimes, the quietest heroes do the most important work.

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