Hinokami Kagura, also known as Sun Breathing, is easily one of the strongest Breathing Styles in the series by a wide margin.
Sun Breathing is the foundation of the Breathing Techniques in Demon Slayer and the five main Techniques: Wind, Water, Flame, Stone, and Thunder are Branched out of it. The Sun Breathing, the prime swordsmanship technique, is more powerful and dominant.
Moon Breathing is the demonic form of the primal Sun Breathing in Demon Slayer anime and manga. Developed by Kokushibo, aka Michikatsu Tsugikuni, this is the second most powerful breathing technique in the series that no human can use. Moreover, it also has more forms than any other type of breathing.
Though Tanjiro succeeds in making use of Water Breathing throughout the early parts of his adventure, he eventually discovers that he's better suited for Sun Breathing instead. Sun Breathing was the first Breathing Style utilized by Yoriichi Tsugikuni.
Over the course of the series, Tanijiro unlocks multiple breathing styles, but only two have been shown in the anime so far. This list contains all the styles that Tanjiro has performed in the anime and the different techniques classed under them.
Tanjiro Is Strong, and Stronger than Zenitsu as he uses Sun Breathing.
Thirteenth Form of Sun Breathing in Demon Slayer
It involves a combination of all existing Sun breathing techniques — but performed in a consecutive manner. This technique's primary purpose is to slash all the twelve vital organs of a demon. Each form targets a specific organ. Tanjiro only used it once in the manga.
Yoriichi Tsugikuni is the creator of the Sun Breathing style and is also the strongest demon slayer that has ever lived. He existed nearly 500 years prior to the events of Demon Slayer and struck fear into the hearts of every demon he came across.
The third form of Thunder Breathing involves an attack that swarms an opponent from all directions and gives them little to no room to escape. This makes Thunder Swarm a highly damaging technique that can completely decimate anyone who isn't ready to deal with its consequences.
The Thirteenth Form of the Sun Breathing Style is unique in the sense that it doesn't really have a name of its own. Rather, it's a combination of all the twelve forms present in this style, used in succession to maximize their power. This move was devised by Tanjiro solely to defeat Muzan.
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.
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. Such a weapon takes immense precision and soundness to use without inflicting personal damage.
Mitsuri's Breathing Style is Love Breathing, a bit odd-sounding next to Styles that draw on nature such as Water Breathing and Thunder Breathing.
The warrior Muzan feared was a swordsman named Yoriichi Tsugikuni. Yoriichi was the only slayer before Tanjiro who came close to killing Muzan, and the flashback of their fight occurred in Chapter 187.
Many Kimetsu no Yaiba fans deduce that Yoriichi is Tanjiro's father, but that isn't the case. However, Yoriichi is responsible for teaching Tanjiro's ancestors the Hinokami Kagura, which has been passed down for generations.
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.
Demon Slayer's season 3's latest episode has left fans on edge with Tanjiro's discovery of Yoriichi Tsugikuni's Type Zero sword.
Some of the characters who have faced Yoriichi and survived
This happened due to a treatment that had gone wrong. While he was being treated, Muzan killed the doctor because he was not able to observe any results.
What yogis refer to as Moon Breath or Chandra Bhedana involves breathing in through your left nostril only. The left side of your body is thought to be associated with the nervous system, and so Chandra Bhedana has been traditionally used to calm it down and promote sleep.
Zenitsu is clearly on the same level as Hashira. If we compare him to Shinobu, his speed is far better, while she lacks quite a lot in raw power. There is a good chance that he could beat Shinobu if the two decide to fight.
Although Inosuke possesses immense strength and endurance, he's no match for Zenitsu's insane speed and his Thunder Breathing.
In conclusion, Tanjiro will not be able to kill Muzan by himself since the Demon King is far superior in every aspect of combat. The manga has shown fans the singular way that Muzan could be bested and it was only due to the collective efforts of Demon Slayer Corps members.