Gyomei Himejima

Gyomei Himejima is a Demon Hunter and the Rock Pillar of the Demon Killing Corps.

He is confirmed to be the strongest demon hunter by Inosuke Hashibira and Tanjirou Kamado.'

History
Before Gyomei was a Demon Hunter and Pillar, he lived with nine other children who were orphans and raised them in a temple. The area was well known for demon attacks so Gyomei had always burned Wisteria Incense to ward off any demons that would harm him and the children.

One night, one of the nine children disobeyed the temple rules and had gotten into contact with a demon and in order to save his own life, he told the demon to eat the other children including Gyomei. After night fell, the child invited the demon into the temple after putting out the Wisteria Incense.

Four children were immediately killed by the demon and the remaining children insisted on escaping the temple, ignoring Gyomei's orders. His frail stature and blindness fueled the distrust the children had in Gyomei's ability to protect them, which led them to abandon him and ultimately get killed by the demon.

In the end, only one child-- the youngest, Sayo-- had listened and stayed behind in fear of the demon.

Though it is unknown how the exchange went down, Gyomei had been cut across the forehead by the demon but soon reversed the situation and began attacking the demon mercilessly after realizing he had a "frightening amount of power." He went on and beat the demon's head until the sun arose.

Soon after, people came to the scene of the incident to help but he was soon framed by Sayo as he said "That man's a monster. He killed them. He killed everyone."

He was later imprisoned and charged with the murder of the seven children but Kagaya Ubuyashiki, a.k.a "Oyakata-sama", intervened and released before he would've been executed for his false crimes.

Later on, Gyomei became a Demon Hunter and later the Rock Pillar.

Natagumo Mountain Arc
Himejima was present with the other Pillars when Kamado Tanjirou awoke.

Natural Abilities
Enhanced strength: Even before undergoing training, Gyomei possessed great, inhuman strength despite having a weak build at the time he discovered his abilities. He can also use his strength to push a large boulder bigger than him through a town along with the help of 'Repetitive actions.'

Enhanced hearing: Being blind, it can be assumed Gyomei has remarkable hearing, being able to become a Pillar. He also remarks on the sound of Muzan's flesh regeneration during their brief confrontation

Swordsmanship
Breath of Rock Style Himejima wields a hand axe complete with a spiked flail attached to the hilt through a long chain.
 * 1) Third Form: Igneous Reflection - Himejima unleashes a series of slashes with his sword deflecting nearby attacks.

Trivia
Gyomei is blind, thus explaining the reason for the lack of pupils in his eyes. It is unknown whether an incident had caused him to be blind or he was born like this.

According to Uzui, Gyomei was one of the two people who had became a Pillar two months after becoming a Demon Hunter. The other being Muichirou Tokitou.

Quotes
"If I never got attacked by that demon, I would have lived my entire life not knowing I was strong."