Despite his age, Muichiro is immensely skilled in swordsmanship, and his strength can overpower even the older Hashiras of the Demon Slayer Corps. He single-handedly defeated Upper Rank Five, Gyokko.
1) Gyomei. 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.
Overall, Zenitsu is an extraordinary powerful Demon Slayer capable of singlehandedly bringing down an Upper Rank, which said to be able to overpower 5 Hashira, in 10 minutes, albeit he would have beheaded Kaigaku in a heartbeat if it wasn't for his feelings of melancholy and pity.
Mitsuri Kanroji is another Hashira who Tanjiro could definitely beat in Demon Slayer. Mitsuri's main trick up her sleeve is her muscle composition, which makes her muscles eight times denser than that of a normal human's. In other words, she's incredibly strong and powerful, and tough with plenty of endurance as well.
8/13 Shinobu Kocho, The Insect Hashira
That being said, she's arguably the weakest Hashira when it comes to pure strength.
Sound Hashira
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.
At this point in the manga, the Hashira had yet to gain their marks, and were later required to team up in order to kill the Upper Ranks. Fighting one-on-one against Akaza for very long would have been nearly impossible for any Hashira, but some could have lasted until sunrise.
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.
5) Yoriichi
Case in point: he was the only one who could single-handedly take on Muzan and drive him to a corner. Yoriichi would be able to defeat every single Hashira on this list without breaking a sweat. Such was his reputation and skill in swordsmanship.
When facing Kaigaku during the Infinity Castle arc, Zenitsu debuts his brand new exclusive Seventh Form to Thunder Breathing. With this, Zenitsu finally has more than one tool in his arsenal and has overcome his own personal doubts and fears.
Yoriichi was born with the Demon Slayer mark and prowess in swordsmanship. His powers were beyond comparison as he defeated Muzan once and had him on the verge of death until he managed to escape.
Which Hashira can beat Nezuko? The Wind Hashira is one of the strongest Hashiras in the Demon Slayer series. He played a significant role in defeating Kokushibo and was able to inflict damage on Muzan. Sanemi's sheer power and speed will be able to overwhelm Nezuko even in her final form.
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.
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.
Demon Slayer's Tengen Uzui is considered to be one of the weakest Hashira due to almost losing this fight, but the fact is that Tengen only looks weak when compared to the most overpowered Hashira.
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.
With that said, all Hashira in Demon Slayer have one glaring flaw: they're only human. As such, they're not infallible and are certainly not tougher than their demon enemies. This results in some rather lopsided matches and emotionally-charged oversights on their part.
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.
If Shinobu goes 1v1 against Akaza, she can turn the tides in her favor by restricting his regenerative abilities with her poison or could even kill him with her fast-paced combat skills.
The respective fights of the Hashiras with the demons are also proof that Rengoku will win in the Tengen vs Rengoku fight. He was single-handedly able to fight Akaza, an upper rank 3 demon, and almost win the fight.
1) Yoriichi Tsugikuni
He was the creator of Sun Breathing which is the most powerful Breathing technique. Yoriichi was the only person who could defeat the progenitor of all the demons, Muzan Kibutsuji. Doma is an inferior opponent, as he won't even last a second in front of Yoriichi.
Tanjiro decapitates Akaza with the Hinokami Kagura: Setting Sun Transformation. Akaza was bewildered, wondering how Tanjiro did not have any fighting spirit, comparing this feeling to fighting against a plant. He acknowledges that Tanjiro surpassed his speed.
As it turns out, Tanjiro has received a few promotions during his service. However, saying that Tanjiro has become a Kanoe doesn't mean much on its own. The Corps' ranks and functions are fairly straightforward.
5 Hashiras who die in Demon Slayer, and how it happens.