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 and brown eyes. 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 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.


Mustard producing toxic gas.

Gas (ガス Gasu?): Mustard's Quirk allows him to generate a vast typhoon of sleep-inducing gas. He is also able to detect any movement within the gas by reading its fluctuation.

Mustard has to continually produce the gas and it will quickly disappear if he stops. He is also not immune to his own gas and needs to wear a gas mask in order to use it.


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 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

Character Appearances

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 Debut
58. Internship's End Absent
59. Listen Up!! A Tale from the Past Absent
Forest Training Camp Arc
70. Wild, Wild, Pussycats Absent
71. Kota Absent
72. Day Two Appears
73. Good Evening Appears
74. Smoke Signal Appears
75. Stake Your Life, Hero! Pictured
76. My Hero Absent
77. It's Okay Flashback
78. Whirling Chaos Appears
79. Drive It Home, Iron Fist!!! Appears
80. Establishing the Bakugo Bodyguard Brigade Absent
81. Roaring Upheaval Appears
82. What a Twist! Absent
83. Loss Appears


  • His villain name comes from Sulfur mustard, better known as "Mustard Gas", which was infamously deployed in World War I and is further referenced by his mask and helmet taking inspiration from the era.
  • 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, Hood, 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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