1) Shinobu Kocho
The Insect Pillar of Demon Slayer Corps, Shinobu is undeniably the smartest individual. She might not be physically stronger than others, but her intelligence is what kept her going.
Gyomei Himejima is the strongest Hashira in Demon Slayer. This fact has been established in the manga as Tanjiro, Inosuke and Zenitsu all agree that he is the strongest member of the Demon Slayer Corps. His strength was showcased during the fight against Kokushibo.
>480 (Chronologically)
Tengen Uzui
He is the fastest Hashira, and the second physically strongest. Obviously, then, Tengen Uzui is rather proud. He is demanding, fussy, boastful, and prone to selfishness. But he is also ultimately kind and caring, with great love for his three wives as well as the other Hashira.
Rengoku's fight in the Mugen Train arc showed his incredible speed and reflexes. He was able to match Akaza's speed, and his movements were so fast that it was almost impossible for the naked eye to keep up. Tengen, meanwhile, is the fastest runner out of all the Hashira.
2) Sanemi Shinazugawa
His fast movement, combined with his excellent swordsmanship, makes him a remarkable demon slayer. Most of his attacks are purely offensive due to his breathing style. Being a user of wind breathing, he is undoubtedly fast.
Keen Intellect: Shinobu possesses vast knowledge in using poison in combat. She has one of the best IQ in the Corps, having an IQ of over 200 making her a genius.
Don't go! DON'T LEAVE ME HERE! Muzan speaks his final words as he loses control over Tanjiro.
5/14 Fastest Hashira In Running
Despite his large and muscular build, Tengen Uzui is the fastest runner among the Hashira.
9/13 Tengen Uzui, The Sound Hashira
As a result, Tengen Uzui has to deal with the moniker of being the least powerful Hashira around.
Giyu Tomioka and Sanemi Shinazugawa attend as the final surviving members of the Hashira, and together they they get a confirmation that not only are the demons all eradicated, but that the Demon Slayer Corps will be disbanding.
Intelligence: High. In spite of his passive aggressive behavior, Sanemi is a highly skilled swordsman in the Demon Slayer Corps.
Kim Ung-Yong
He holds the Guinness World Record for IQ at 210 and he was invited as a guest student in physics at Hanyang University when he was three year old. He was invited to America by NASA at age eight, he worked at the space organization for ten years and then returned to Korea.
Nadia Camukova, who has an IQ of 200, was born in Moscow in 1976. The Brain Research Institute in Moscow reported later on that she had the highest IQ in the world.
Undoubtedly, Muzan is the fastest and strongest demon in Demon Slayer.
Sanemi is quite possibly one of the rudest Hashira to have ever existed. Although he's a powerful individual, as seen in the manga during his fight against Doma, one of Muzan's 12 Kizuki, he severely lacks people skills. Sanemi's rise to unpopularity stemmed from his treatment of Nezuko the first time he saw her.
That means Rengoku can run at least 256 km/h! As such, Rengoku runs with “total concentration” at a 256 km/h speed… That's as fast as a bullet train!! Meanwhile, the Speed Demon is estimated to have a speed of 100 km/h, about the same as the steam locomotive used at the time, shown in the animation.
3 Hashiras that can beat Rengoku in Demon Slayer
Gyomei is considered to be the strongest Hashira in the series. His contribution was monumental in the battle against Kokushibo and Muzan.
He would be disoriented by the shockwaves created by Akaza's blows. Tengen has anti-demon bombs that can disorient them for a short period of time, but this wouldn't be an effective strategy when Akaza uses Compass Needle, which allows him to accurately pinpoint and aim for his opponent's weak spots.