You're getting a top-notch education at a famous school. At least use some strategy. If not... you're barely worth killing.
Mustard to Tetsutetsu Tetsutetsu in "Drive It Home, Iron Fist!"

Mustard (マスタード Masutādo?) is a C-rank villain affiliated with the League of Villains and a member of the organization's Vanguard Action Squad. He and the rest of his team serve as the main antagonists of the Forest Training Camp Arc.


Mustard is a skinny young man with short, wavy, light brown hair. He wears a black gakuran school uniform along with teal gloves and white shoes. Mustard sports a green gas mask that completely covers his face, attached to two oxygen tanks that he carries on his back.



Mustard has been shown to be pragmatic. He believes that it is very important to wait until the right time before striking. He believes that function is more important than style when it comes to support gear and he scolded Himiko Toga for thinking otherwise. He believes that no matter how impressive a person's Quirk is, it doesn't change the fact that they're still only human.

Mustard kicks Tetsutetsu

Mustard being merciless, kicking Tetsutetsu while he's down and can't breathe.

He has also been shown to be exceptionally merciless. He brought a gun to the Vanguard Action Squad's raid on the forest training camp and tried to kill both Tetsutetsu and Itsuka with it.[1]

Mustard seems to bear jealousy and resentment towards U.A. students, as he constantly mocked Itsuka Kendo and Tetsutetsu Tetsutetsu for being "pitifully simple", calling them too straightforward and lamenting how they are "pampered by the world" due to their school's reputation alone.[2] He claims that such things are what's wrong with the world.

He is very proud of himself, his Quirk, his skills, and his accomplishments. Because of this, he has a tendency to boast.


Overall Abilities: Mustard is a capable villain because of his intelligence. He has a good grasp on the capabilities of his Quirk and was able to use them to compete with two U.A. students in a fight at the same time. However, Mustard is not a strong combatant without the use of a weapon and his quirk. He does not seem to possess any hand-to-hand combat skills and relies on the use of his gun to inflict damage.

Skilled Marksmanship: Mustard appears to be a proficient marksman, able to destroy Tetsutetsu's mask with a single, precise shot. His ability to sense the location of enemies within the gas he creates assists his targeting.


Sleep Gas

Mustard producing toxic gas.

Gas (ガス Gasu?): Mustard's Quirk allows him to generate and control a vast amount of sleep-inducing gas. He can generate enough gas to create a typhoon and cover most of Beast's Forest. Mustard is not immune to the gas and it cannot spread too far from his position. He is able to detect any movement from within the gas by reading its fluctuation.


1/5 E
1/5 E
4/5 B
3/5 C
2/5 D
Mustard's stats, according to the Ultra Archive Book

1/6 E
1/6 E
4/6 B
3/6 C
Wide-Ranged Attacks
5/6 A
Mustard's stats, according to the Ultra Analysis Book


Mustard's gun

Mustard's revolver.

Gas Mask: Mustard wears a green gas mask attached to an oxygen tank. He carries the tank on his back and uses the mask to protect himself from the effects of his own quirk.

38 Revolver: Mustard carries a small handgun and bullets with him.

Battles & Events

Battles & Events


  • His villain name comes from Sulfur mustard, better known as "Mustard Gas".
  • Mustard's mask and helmet design may be a reference to Oshii Mamoru's Kerberos saga, itself taking inspiration from German World War 1 & 2 gear such as the Stahlhelm.
  • Mustard's Japanese voice actor, Kiyotaka Furushima, also voices Hanta Sero.
  • Mustard's English voice actor, Daman Mills, also voices Moonfish and the Chainsaw Nomu.
  • He is currently the only member of the Vanguard Action Squad whose fate following his arrest after the training camp invasion remains unknown.


  • (To Tetsutetsu Tetsutetsu) "Coming at me like the Terminator, huh? And why're you just charging in like a madman? Give me a break. You're getting a top-notch education at a famous school. At least use some strategy. If're barely worth killing."[3]
  • (To Tetsutetsu Tetsutetsu and Itsuka Kendo) "Bwa ha ha ha! It's two-on-one, so one of you decided to hide for a sneak attack?! Ha ha ha! Simple. Pitifully simple. I'm creating this gas and controlling it!! Every move you make...creates ripples and tells me where you are! There's no hiding from me!! Why's that so unthinkable to you? You're from U.A., so show me something more! I guess I'll forgive you for an attack like that..."[3]
  • (To Tetsutetsu Tetsutetsu) "Hey...aren't you supposed to be heroes someday? It doesn't make much sense to a simpleton like you gets praised because of your school's're pampered by the world just because of your alma mater!! Don't ya think it's not right?!"[3]


  1. My Hero Academia Manga and Anime: Chapter 78 and Episode 43.
  2. My Hero Academia Manga and Anime: Chapter 79 and Episode 43.
  3. 3.0 3.1 3.2 My Hero Academia Manga: Chapter 79.

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