A mother boar raised Inosuke Hashibira ever since he was young and thrown to safety into water by his mother shortly before she died. Whilst he did live in the mountains by himself he still managed to learn how to talk by learning from other humans. These humans were Takaharu and his elderly grandfather.
Inosuke was raised by wild boars in the mountains and created his own Breathing Technique called the Beast Breathing, which is based on wild animal instincts. Inosuke didn't receive any formal training, unlike Tanjiro from the former Water Pillar, or Zenitsu from the former Thunder Pillar.
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Since this Breathing Style is personally created and self-taught by Inosuke Hashibira after living in the mountains and fighting for survival, it can be assumed that it can only be utilized by someone with dual Nichirin katanas and an extremely acute sense of touch.
He is a member of the Demon Slayer Corps who makes use of his self-made sword style Beast Breathing. He is a travelling companion of the series' main protagonist Tanjiro Kamado.
Inosuke Hashibira
A young boy who was raised by his mother Kotoha Hashibira for a short time until she was murdered by a demon, later revealed as Upper Rank Two, Doma of the Twelve Kizuki. After she sacrificed herself to save his life, he was raised by wild boars, and then taught to read and write by an old man.
Inosuke Hashibira is one of the strongest characters in Demon Slayer despite not being a Hashira, the highest rank in the Corps.
4 Fourth Fang: Slice 'n' Dice
The Slice 'n Dice is pretty similar to Devour, with both swords being used for a damaging simultaneous blow.
Yoriichi Tsugikuni is the creator of the Sun Breathing style and is also the strongest demon slayer that has ever lived. He existed nearly 500 years prior to the events of Demon Slayer and struck fear into the hearts of every demon he came across.
Although Inosuke refuses to acknowledge that he has met him before, Doma explores his memories and reveals that he met Inosuke when he was a child, and was responsible for killing his mother, causing Inosuke to fill with hatred and engage in combat with the Demon.
It is confirmed in the Volume 23 extras that Inosuke and Aoi did eventually end up together and that they have two great-grandsons, one of which is Aoba.
Inosuke was found by wild boars, who protected and raised him as their own. Having almost no memory of his birth mother, Inosuke considered a female boar as his mother. It was revealed in the Demon Slayer manga that the mask Inosuke wears was originally the head of the mother boar that raised him.
He challenged a demon slayer that came into his woods and he beat him and took his swords because he thought he was stronger. How is this still getting revisited?
Inosuke Hashibira is the creator and only user of beast breathing. Along with his life in the wild, this style has caused Inosuke to develop a unique fighting style.
Inosuke was raised by boars for most of his life before the Final Selection. It was revealed later that he was born into a family with an abusive father and escaped from his father with his mother.
The warrior Muzan feared was a swordsman named Yoriichi Tsugikuni. Yoriichi was the only slayer before Tanjiro who came close to killing Muzan, and the flashback of their fight occurred in Chapter 187.
"Breath of the Sun: Thirteenth Style") is the thirteenth form the Sun Breathing and the pinnacle of all Breathing techniques in history. This technique was created by Yoriichi Tsugikuni himself in order defeat Muzan Kibutsuji.
4 Fourth Form: Distant Thunder
It takes every ounce of speed and strength that Zenitsu has to avoid these lightning strikers and prevent any serious damage from debilitating him during battle.
That's exactly what happens during the fifth form of Moon Breathing. In it, Kokushibo launches one slash after another toward his opponents, stacking each slash on top of the other. This results in a typhoon of sword slashes and crescent blades, which is almost impossible to dodge.
His Blood Demon Art is “Electrokinesis,” which uses various forms of Thunder breathing. During their fight, Zenitsu was at a major disadvantage against Kaigaku until he used the seventh form called “Honoikazuchi no Kami,” literally meaning “Flaming Thunder God.”
Demon Slayers are known for their strength and bravery in battle, but not Zenitsu. Despite his cowardice, he's one of the strongest in the series.
When it comes down to it, Inosuke and his companions wouldn't stand a chance against most of the Hashira. They've got far more training to do before they reach the level of the Demon Slayer Corp.'s strongest members.
Muzan Kibutsuji is by far the worst of demonkind in Demon Slayer, objectively or otherwise. Everyone, including his most loyal subordinates, is terrified of him, especially in light of his fickle impulses.