Iwao Oguro

• Overview
• Gallery
• Synopsis
• Relationships

Overview	Gallery	Synopsis	Relationships

Whatever I might say to you, I know you’ll do what you have to and save the people who need saving. You’ll give it all you’ve got and then some. It’s that iron will that can turn things around and make the impossible, possible. I know that you can do it, and I know that you will. Don’t doubt yourself. Just act. Fly, Koichi. Fly, Hero.

Iwao Oguro's letter to Koichi Haimawari in "Letter"

Iwao Oguro
Biographical Information
Japanese Name	雄 (お) 黒 (ぐろ) 巌 (いわお)
Rōmaji Name	Oguro Iwao
Alias	Knuckleduster (ナックルダスター, Nakkurudasutā?) Janitor of the Fist (鉄 (てっ) 拳 (けん) 掃 (そう) 除 (じ) 人 (にん) , Tekken Sōjinin?) Takeshi Kuroiwa (黒 (くろ) 岩 (いわ) 武 (たけ) 司 (し) , Kuroiwa Takeshi?) High-Speed Hero: O'Clock ("超速ヒーロー" オクロック, "Chōsoku Hīrō" Okurokku?) Hyper Quadfist (超 (チャオ) 頻 (ピン) 四 (スー) 拳 (チェン) , Chaopin sūchen?)The Ripper (ザ リッパー, Za Rippā?)
Personal Description
Age	45 (First appearance) 48 (Current)
Gender	Male
Height	185cm (6'1")
Hair Color	Black
Eye Color	Black
Quirk	Overclock (Formerly) Quirkless (Currently)
Status
Status	Unknown
Family	Unnamed wife Tamao Oguro (Daughter)
Occupation	Pro Hero (Formerly) Vigilante
Affiliation	Naruhata Vigilantes (Formerly)
Fighting Style	Hand-to-hand combat and weaponry
First Appearance
Manga Debut	Chapter 1 (Vigilantes)

Iwao Oguro (雄 (お) 黒 (ぐろ) 巌 (いわお) , Oguro Iwao^?), commonly known as Master (師匠, Shishō^?) is the vigilante known as Knuckleduster (ナックルダスター, Nakkurudasutā^?). He was formerly the Pro Hero known as High-Speed Hero: O'Clock (超速ヒーロー・オクロック, Chōsoku Hīrō Okurokku^?) in Japan, and Hyper Quadfist (超 (チャオ) 頻 (ピン) 四 (スー) 拳 (チェン) , Chaopin sūchen^?) in China.

Appearance

Knuckleduster is a towering, heavily muscled man. He has short dark hair and visibly thick eyebrows, and also possesses heavy stubble and a prominent scar running diagonally down his left cheek.

His costume consists of a simple wrap-around black mask tied over the top of his head, a tight-fitting dark shirt, jeans, boots, and a long hunter green trench coat. On his hands, he wears a pair of dark gloves topped with a pair of brass knuckles, or knuckledusters, from which he derives his name.

As O'Clock he wore a full-body red suit and a case that covered his eyes and half of his face. He also wore gloves and boots, and his suit had several lines around the arms, legs, and torso. On his shoulders, he had what appeared to be his symbol. He was noticeably slimmer at the time, though still quite muscular.

Gallery

Iwao as the Ripper.

Unshaven.

Personality

Knuckleduster is an individual with a strong sense of justice and drives to do the right thing. He has no government-issued hero license, but this does not stop him from putting on his costume and going out every night to fight street-level criminals and local gangs to keep his neighborhood safe from crimes most "heroes" will not bother with. Despite this reckless streak, he does genuinely admire Heroes for the work they do. This is probably because he also used to be a Pro Hero before his powers were stolen, which left him Quirkless.

Knuckleduster is known for his violent nature.

Knuckleduster shows no resentment towards people who do and shows no fear towards villains who have powerful Quirks. In fact, he seems to love fighting against particularly strong people who have powerful Quirks, enjoying the challenge and becoming very upset or frustrated whenever there are no particularly strong Villains to fight. When a fight is too easy, he quickly becomes depressed. This seems to be one of the main joys of his life, as he becomes invigorated whenever he gets to fight a strong opponent. He is even willing to fight against Pro Heroes if the situation calls for it.

Knuckleduster seems to be a person with a tendency to use violence to solve any problem. He prefers to punch first and ask questions later, as he is willing to beat up people he deems to look suspicious on the slim chance that they may be villains or users of the Trigger drug, forcing his teammates to hold him back before he goes too far. His attitude extends that he was willing to attack a young-appearing woman under the suspicion of being a villain. Knuckleduster feels little to no guilt or worries about what he does, despite the fact that he could have been registered as a Villain if the misunderstanding continued, showing a more aloof and careless side to his personality.

However, despite this, he has proven to be more intelligent and perceptive than he seems to be at first. His conclusions are usually right, proving to have a great capacity for deduction. During fights he is able to devise strategies and stratagems very quickly to deal with villains with dangerous or problematic Quirk, knowing when is the best time to attack or what item is the most adequate to defeat them. And when he is not wearing his vigilante attire, he can behave like a well-mannered and polite person, presented a perfect façade of a worker for a local non-profit organization, complete with business cards and a technically true spiel about the group.

Iwao taking care of his wife.

The truth is, underneath his intimidating exterior and violent behavior, Knuckleduster is actually a very caring and compassionate individual who cares for the people close to him and encourages them to achieve their goals. He trains Koichi Haimawari to improve his combat style and his Quirk and is proud of his progress. He is also a loving father and husband who holds a deep grudge against the people who hurt his family.

Abilities

Overall Abilities: Knuckleduster is currently Quirkless, proven when Eraser Head tried to erase his Quirk to no avail. Despite this, however, Knuckleduster still possesses a large amount of physical strength and skill, which enabled him to fight on even terms even with a Pro Hero like Shota. Knuckleduster appears to be skilled in hand-to-hand combat, utilizing brass knuckles as his weapon of choice. Knuckleduster's skill with his fists was great enough to overcome the swordsmanship of Stendhal, a powerful and notorious Vigilante, landing a heavy blow before the vigilante could scratch him, single-handedly defeating the swordsman. During his time as a pro hero, he went undercover and fought Kendo Rappa in a cage match, managing to stay conscious and unharmed after the villain used his Strongarm, an impressive feat considering the power of his Quirk and how easily he defeated most of his opponents with it.

• Enhanced Durability: Despite being Quirkless, Knuckleduster is very sturdy, standing up even when he receives blows from physical enhancement Quirks. Perhaps more impressive is how he is able to withstand Kendo's Strongarm blows, which individually were powerful enough to break Eijiro Kirishima's Red Riot Unbreakable.
• Enhanced Strength: Knuckleduster's strength is surprisingly high, and he is sometimes mistaken for having a strength-enhancing Quirk. He was capable of going fist to fist with a tremendously physically powerful and fast-moving Trigger-enhanced man and knock him out with relative ease.

Keen Intellect: Despite appearing to be a mere brawler, Knuckleduster has great intuition and tactical knowledge. When fighting Trigger-enhanced villains, he is able to work out how their Quirks work and the best way to counter them all while locked in a fight with them. He also quickly understood Stendhal's way of fighting as well as his state of mind, and also preemptively formulated a battle plan that would allow him to defeat Kuin Hachisuka whilst also saving the life of his daughter, Tamao.

Former Quirk

Iwao using his heightened speed and perception.

Overclock (オーバークロック, Ōbākurokku^?): Iwao's Quirk allowed him to accelerate his brain's perception to extreme speeds, making it appear to him as if the world was moving in slow motion. While his Quirk was active, his accelerated perception granted him increased physical speed.

The Quirk requires a cool-down period after it is used, and can only be used for a few seconds at a time.

At some point in the past, Iwao's Quirk was stolen by All For One, leaving him Quirkless.

• Heightened Focus: Thanks to his Quirk, O'Clock could see, hear, and think at hyper speed.

Equipment

Brass Knuckles: Knuckleduster's main weapons and the reason for his Vigilante name.

Grappling Hook: Knuckleduster has been seen swinging from buildings by means of a grappling hook.

Painkillers: Used to tone down pain. Bought regularly from Giran.

Taser Knuckle: A taser weapon with a built-in defibrillator. Bought off Giran.

Pheromone Cocktail: An explosive cocktail made to draw in bees and then explode. Made with items obtained from Giran.

Sniper Rifle: A high-precision firearm, which allows shooting at a very long distance.

Radio Box: A regular radio box used against Number 6 to counter his usage of Overclock.

Shotgun: A firearm used for close range encounters.

Battles & Events

Battles & Events

History Underground Masquerade The Ripper vs. The Rapper O'Clock, The Rapper, and Tiger Bunny vs. the Hooded Man O'Clock vs. All For One Vigilantes Beginnings Arc Nice Guy & Knuckleduster vs. Soga Moyuru & Rapt Knuckleduster vs. Eraser Head Naruhata Vigilantes & Eraser Head vs. Mario, Soga, Moyuru & Rapt Koichi Haimawari & Knuckleduster vs. Rock Villain Naruhata Vigilantes vs. Teruo Unagisawa Knuckleduster vs. Junkie Villain Team Idaten & Naruhata Vigilantes vs. Bat Villain Stendhal Arc The Crawler, Knuckleduster & Soga vs. Stendhal Vs. Queen Bee Arc Knuckleduster vs. Kuin Hachisuka Sky Egg Arc Knuckleduster vs. Number 6

Trivia

• Iwao's surname contains the kanji for "male" (雄, o^?) and "black" (黒, guro^?), and his first name contains "rock, crag" (巌, iwao^?).
• Knuckleduster's favorite things are cigarettes and beer.
• His vigilante name is another name for the brass knuckles that form a part of his costume.
• Hideyuki Furuhashi, the author of Vigilantes, said that if All Might was Superman, Iwao would be comparable to Batman.
• Furuhashi also said that O'Clock is based on DC Comics' The Flash.