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.
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.
In terms of physical strength, Tengen Uzui is far from being the weakest Hashira. While his feats throughout the Daki and Gyutaro battles certainly displayed this, there's additional evidence to show that he's not the weakest Hashira.
Kyojuro Rengoku surpasses Tengen on many levels, be it strength, Breathing Technique, or battle Intellect. So to cut a long story short, Kyojuro Rengoku is more powerful than Tengen Uzui.
1. Gyomei Himejima. Gyomei Himejima, the Stone Hashira, is the strongest Hashira in the Demon Slayer corps in terms of strength and swordsmanship. He is the only person who uses spiked flails and an axe instead of standard swords to kill demons.
Obanai Iguro is one of the harsher Hashira members. He demanded that Giyuu be punished for allowing Nezuko to get away unharmed, and later restrained Tanjiro as he tried to help his sister. He hates demons and has little regard for his fellow Hashira, except Mitsuri Kanroji later on.
But, comparing the two characters in their best forms, Zenitsu might be just a tad bit faster owing to his Godspeed move.
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.
With all said and done, Tengen Uzui is one of the strongest and most extremely skilled Demon slayer in the series, his physical abilities, combat skills and strategic thinking makes him a tough opponent to defeat in a battle.
Despite being the lowest of the Upper Ranks, Gyutaro showed much of his demonic prowess by making Tengen lose his left arm and his left eye in battle. However, Giyu would have been a better opponent for the demon and could have defeated him without losing any limbs.
1) Kyojuro Rengoku
Kyojuro Rangoku is the Flame Hashira that was loved by the entire fanbase. His enthusiasm and an unwavering sense of justice enabled him to become the man that he was. Unfortunately, Rengoku was killed by Akaza, the Upper Moon 3.
1) Shinobu Kocho
The Insect Pillar of Demon Slayer Corps, Shinobu is undeniably the smartest individual.
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.
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.
The Upper Moon 6, a cruel demoness named Daki, may have lost to Tanjiro and Tengen in the end, but she could defeat a wide variety of heroes from other anime if they tried to slay her.
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 isn't Faster Than Zenitsu, not at all. He is Strong but Slow. So, Zenitsu Will Probably Chop Him Down to bits before tanjiro even pulls out his sword properly. There ya go!
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.
The only Demon he despises the most is the Upper Rank Two: Doma. It is quite a shocker that the second most potent Demon in the Demon Slayer is not Muzan's favorite.
Akaza was also one of Muzan's favorite demons out of all his subordinates. The reason behind this is Akaza's extreme loyalty to his master. The Upper Rank Three demon was always sent away on special missions, something the Upper Rank 1 and 2 were often denied of.
14 She Has A Really Sweet Relationship With The Hashira Mitsuri Kanroji. In the manga, Nezuko gets to know the Love Hashira Mitsuri Kanroji and looks up to her like an older sister, which makes their relationship interesting since Nezuko usually sees female humans as either a surrogate mother or a young sister.