Yoriichi Tsuguikuni [5].

Many years ago, humans and dragons lived in peace; dragons did not attack humans, while humans did not attack dragons. But one fateful day, the peace treaty between humans and dragons was broken by a greedy human. Everyone forgot his name, but everyone remembered his surname, "Tsuguikuni." Since then, humans and dragons have been engaged in a brutal war. Almost 100 years have passed and the war between humans and dragons during that time Yoriichi and his family continued the war fighting at the front against the dragons until one day he met a half-dragon named Muzan, who was alone and scared...

•Affiliation: Dragon Hunting Corps. •Occupation: Dragon Hunter. •Combat Style: Sun Breathing.

•Species: Human. •Gender: Male. •Age: 17-24 (Youth). •Hair color: Crimson with orange tips. •Eye color: dark red •Family -Uta (Wife) (murdered). -Unborn child (murdered). -Michikatsu Tsugikuni (Older twin brother). Father. -Akeno Tsugikuni (mother, deceased). -Muichiro Tokito (Descendant). -Yuichiro Tokito (Descendant). •Related -Sumiyoshi Kamado. -Suyako Kamado.

Yoriichi was a quiet and respectful individual, with a solemn and reserved expression at all times, rarely showing outbursts of emotion. Generally, Yoriichi had a calm and collected disposition, evident when he slew demons without changing his expression or when Muzan was surprised by his immense skill due to his modesty. Due to his kind nature and unchanging facial expression, most could not decipher his feelings; the only person who could read his feelings without difficulty was his wife Uta. In his own words, the world was beautiful, and he believed it was a blessing to have been born into it. He was also extremely humble, considering himself just another man and no one special despite his extraordinary abilities; one example being the time he performed the Sun Breathing forms for Suyako at her request, and almost seemed ashamed afterward. Yoriichi was also renowned by his brother for his faith in the future and his confidence that, despite the immense power of the dragon slayers, through the use of the Breathing Styles, a generation would emerge that would surpass their own. As a child, Yoriichi looked up to his older brother Michikatsu. Michikatsu's dream was to become the strongest samurai in the kingdom, so he claimed he would be the second strongest. Even as a child, he was extremely reserved and quiet, and his family believed he was deaf for seven years, as he never spoke.

Yoriichi was a tall man with a slim, muscular build, fair skin, maroon eyes, and long, spiky hair tipped with red, tied back in a ponytail. He bore a similar appearance to his twin brother Michikatsu, but unlike him, he was slightly thinner, with shorter bangs and wavier hair. Yoriichi was mostly expressionless, though sometimes a bit solemn and aloof. Yoriichi wore a black military uniform with gold buttons. He sometimes wore a red haori over a very pale orange nagagi kimono, with a black umanori-style hakama tied with a white uwa-obi, a pair of zori with red straps and white tabi socks, and a Nichirin sword hanging from his left waist, as is customary for most dragon slayers. He wore hanafuda earrings created by his mother as charms when he was believed to be deaf; Later, he gave them to his friend Sumiyoshi Kamado, who passed them on to his descendants and eventually to Tanjiro as well. As a child, Yoriichi wore his hair loose and shoulder-length. Due to his low self-esteem during his childhood, his attire was plain compared to Michikatsu's more elaborate clothing: a red haori with a pale orange obi.