Yoriichi Tsugikini. Yoriichi Tsugikuni is the strongest demon slayer character to have ever existed in the series. He is also the only person that Muzan was ever afraid of. He invented the original breathing styles that later branched out into the ones that Harshiras use to date.
1 Kyojuro Rengoku
Kyojuro Rengoku became one of the most likable characters in Demon Slayer despite having just a little involvement with the plot. As the flame Hashira, he was full of confidence and vigor, his positive outlook contagious to others around him.
Shinobu Kocho is a capable Demon Slayer whose worthy of being the Insect Hashira. That being said, she's arguably the weakest Hashira when it comes to pure strength. However, brawn is not the only way to determine power in Demon Slayer.
Rengoku became our favorite Hashira for obvious reasons, but it's also true that his Flame abilities are one of the most powerful. This paired with his determination, empathetic and kind attitude, and his overall passionate personality, makes Rengoku #1 on this list.
The young Tanjiro is not only one of the greatest demon slayers, but thanks to his kind nature, he's also one of the most honorable characters of the series. Tanjiro not only showed selflessness and love towards his sister and the people he cared for but even showed kindness towards his demonic enemies.
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.
In the beginning of the series, Zenitsu is seen as a weak person who doesn't seem capable of much until he is asleep. In his sleeping state he awakens an extraordinary power that makes him an extremely powerful and skilled swordsman.
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. Shinobu is proficient in medical knowledge and can also create poisons out of wisteria flowers that are lethal to demons.
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.
The Mist Hashira, along with Gyomei, Sanemi, and Genya, fought the Upper Moon 1. While the group was able to defeat them, both Muichiro and Genya died due to the wounds inflicted by Kokushibo.
When it comes to pure strength, Shinobu Kocho is the weakest Hashira in Demon Slayer. She doesn't even have enough strength to decapitate a demon's head and she makes up for it by injecting poison into the demons.
According to Tengen Uzui, Muichiro became a Hashira only two months after picking up a sword. Even before he entered the Demon Slayer Corps, Muichiro could sleep soundly no matter if there was a tempest or a thunderstorm, and he never lost his appetite.
Shinobu Kocho Is the Weakest Hashira
At one point or another in the manga, all nine Hashira in Demon Slayer encountered an Upper-Rank. Of the three Hashira who were killed by Upper-Ranks -- Rengoku, Shinobu and Tokito -- Shinobu was the only one who was killed almost instantly when she encountered Doma, Upper-Rank Two.
Tanjiro's Current Demon Slayer Rank Is Kanoe
Not many of the Demon Slayers' ranks are known as of Season 2, but there are a few. Tanjiro, Zenitsu, and Inosuke have moved from Mizunoto up to Kanoe due to their exploits. Murata, the Demon Slayer, who was almost digested on Mount Nagumo, is also a Kanoe.
Sensing their despair, Doma offered a chance to him and turned both Gyutaro and Daki into demons.
Shinobu, the insect Hashira, is one of the fan-favorite female characters in Demon Slayer. She is also the most unique swordsman in the anime. Instead of relying on her physical strength, she smartly uses Wisteria poison (harmful for only demons) to weaken demons and then easily slices their necks with her katana.
However, he most definitely has one. Fans believe that Muzan's favorite demon is Akaza because he trusts him the most and he's the one he contacts the most. However, it is actually Kokushibo.