Besides Sun Breathing, Yoriichi possessed a wide range of traits and abilities common with the strongest demon slayers in the series. For example, he was born with the demon slayer mark, greatly enhancing his physical capabilities.
Yoriichi was the very first user of the Breathing Styles and he came up with Sun Breathing, a powerful breathing form that is known to be the most effective against demons. It's through Sun Breathing that all the other Breathing Forms have been derived.
But as per Demon Slayer's timeline, Tajiro Kamado is the only alive Sun Breathing user. Though, since the technique stems from a form of dance, Tanjiro's father Tanjuro Kamado, and their ancestor, Sumiyoshi also unknowingly knew Sun Breathing techniques.
Sun Breathing was initially created with 12 techniques all connected to one another by Yoriichi Tsugikuni. Later upon meeting Muzan Kibutsuji, Yoriichi perfected his swordsmanship form, creating a new unnamed thirteenth form.
Demon Slayer's season 3's latest episode has left fans on edge with Tanjiro's discovery of Yoriichi Tsugikuni's Type Zero sword.
During episode three we learned that the Yoriichi Type Zero was built by Kontetsu's ancestors more than 300 years ago, during the Sengoku era.
The dance is composed of twelve segments repeated throughout the night. The last user is Tanjiro Kamado, who learned the breathing style from his father, Tanjuro Kamado. Though, other people can learn this, if taught by a Kamado.
Hinokami Kagura, also known as Sun Breathing, is easily one of the strongest Breathing Styles in the series by a wide margin.
Just like Tanjiro, Yoriichi knows how to use a technique known as the Thirteenth Form.
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.
Yoriichi Type Zero ( 緑 より 壱 いち 零 ぜろ 式 しき , Yoriichi Zeroshiki?) is a mechanical battle doll constructed by Kotetsu's ancestors during the Sengoku period.
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.
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.
Long forgotten and unknown to most of the Hashira during Demon Slayer's narrative, the technique was kept alive by members of the Kamado family, and passed down from father to son as a ceremonial dance performed every New Year.
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.
Moon Breathing is solely used by Michikatsu Tsugikuni, one of the first Demon Slayers who utilized Total Concentration Breathing, and is a Breathing Style which he continued using and perfecting after becoming a demon.
Yoriichi had lost his wife and unborn child to demons, and he had a fateful encounter with Muzan Kibutsuji, the Progenitor of Demons. Yoriichi defeated Muzan in an instant, but he had a question for him before eliminating him, which allowed Muzan to escape.
In the Demon Slayer manga's final chapter, Yoriichi and his family have been reincarnated and are seen in the deep background of a panel as Tanjiro's own descendants head to school.
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.
Yes he was what proves it is that only hashiras are allowed to engrave words on their swords, you can see some words are engraved on his sword which proves that he was a hashira.
Michikatsu, who snuck around behind their father's back to see his brother, pitied Yoriichi, who was thought to be deaf until he was seven and clung to his mother's side at all time. At some point, he gave Yoriichi a flute he made as a gift.
So now, Tanjiro, the protagonist of the Demon Slayer series, has access to a sword that belonged to the best swordsman to have ever lived. This sword was in bad condition, but Hotaru Haganezuka took it upon himself to restore the blade to its former glory.
Tanjiro's ancestor was a good friend of Yoriichi and arguably was one of his only true friends. Therefore Yoriichi gave the earrings as a gift, and since then they have been passed down the generations until they reached Tanjiro.
This mastery allowed Zenitsu to form a Seventh Form of Thunder Breathing that is unique only to him: Honoikazuchi no Kami. While this move might seem similar to Thunder Breathing's First Form, the speed and power of this technique are on a whole new level.