OnePunch-Man Wiki


658pages on
this wiki
Add New Page
Comments42 Share

Iaian (イアイアン, Iaian) is the A-Class Rank 2 professional hero and a top disciple of Atomic Samurai.



Iaian without his helmet

Iaian is a young man with short blonde hair and blue eyes. He wears a long sleeved black shirt under his sleeveless medieval silver armor as well as a helmet. He carries his sword on the left side of his hip. After his fight with Melzalgald, he lost his left forearm.


Iaian is shown to be quick-tempered as witnessing the widespread destruction of A-City, an act he deems "unforgivable," enrages him. Also, upon being attacked by a mysterious alien, Iaian gives no quarter and responds immediately with an attack of his own. He is quite headstrong and cocky since he willing to take on Garou head on to make his master proud of him without regarding his strengh.


The following section contains Webcomic spoilers. You have been warned manga-only readers.

At some point in the past he and his teammates fought Child Emperor and lost.


Hero Association SagaEdit

Alien Conquerors ArcEdit


Iaian dodging an attack and losing his arm

After the destruction of A-City, Iaian climbs out of the rubble only to see nothing standing in front of him but the Hero Association's Headquarters. He later saves a father and his son from being killed by Melzalgald after the father moves some rubble to get to his son.[2] As he is standing there, the monster appears behind him and attempts to crush his head. Melzalgald only crushes his helmet, its occupant having moved away in time. He states that there was no way he would not have noticed its killing intent and proceeds to attack the monster.[3] While dodging one of the monsters attacks, his left arm was torn off. Melzalgald began splitting itself into five different form, [4] feeling hopeless of his situation, the monster is suddenly cut to pieces by Atomic Samurai and was ordered to stop bleeding by his master. [5]


Iaian surprised to see Bang alive

While the S-Class heroes are fighting the monster, Iaian advises to retreat and find another way to kill the monster, but his pleas were futile.[6] During the fight he witnessed Bang being struck by Melzalgald attack and was surprised to see he was unharmed.[7] After the monster was defeated the spaceship that was above them began to collapse and Iaian was helped carried by Atomic Samurai.[8]

Human Monster SagaEdit

Monster Association ArcEdit

Iaian, Okamaitachi and Bushidrill are waiting outside discussing about Garou's hero hunt, while their master Atomic Samurai is attending a meeting with the Council of Swordmasters.

The following section contains Webcomic spoilers. You have been warned manga-only readers.

Iaian, Okamaitachi and Bushidrill confront Devil Long Hair. At some point, Iaian is knocked out by Black Sperm and Garou steps on his face.

Abilities and PowersEdit

Being the second highest A-Class hero, Iaian is a rather powerful individual. It is also stated by Fubuki that, like his fellow disciples, he could be S-Class if it wasn't for Sweet Mask. It is worth noting that while he was weakened after losing his arm, he remains a powerful fighter.

Fighting StyleEdit

Expert Swordsman: Being the top disciple of Atomic Samurai, Iaian is extremely skilled with the sword. He has been shown to have a rather keen grasp of what is happening around him, easily avoiding an attack from a large monster and then returning a strike right after.

  • Iai of Certain Kill (必殺の居合, Hissatsu no Iai): True to his name, Iaian attacks with iai strikes, unsheathing his sword, performing slashing attacks, and returning the sword to his sheath all in an instant.[1]


Katana: Iaian carries a katana that has a black hilt with a circular hand-guard. The sheath is painted black.

Hero RatingEdit

Iaian's rating determined by the Hero Association:[1]

Ability Type Strength Intelligence Justice Endurance Speed Popularity Effectiveness Fighting Ability

Major Battles Edit


  • Iaian's name is a Japanese portmanteau of "iai", a sword-based Japanese martial art, and "aian" or iron, referring to his armored appearance.
  • It is unknown why he doesn't replace his lost arm with cybernatic arm since Bofoi is capable of this feat in the Hero Association.


  1. 1.0 1.1 1.2 1.3 1.4 One-Punch Man Encyclopedia; One-Punch Man: Hero Perfection, page 28-29
  2. One-Punch Man Anime; Episode 10
  3. One-Punch Man Manga; Chapter 31, page 6-12
  4. One-Punch Man Manga; Chapter 31, page 22-27
  5. One-Punch Man Manga; Chapter 32, page 2-7
  6. One-Punch Man Manga; Chapter 33, page 3-4
  7. One-Punch Man Manga; Chapter 34, page 11-16
  8. One-Punch Man Manga; Chapter 36, page 3-4


Ad blocker interference detected!

Wikia is a free-to-use site that makes money from advertising. We have a modified experience for viewers using ad blockers

Wikia is not accessible if you’ve made further modifications. Remove the custom ad blocker rule(s) and the page will load as expected.