Yoriichi Tsugikuni

Yoriichi Tsugikuni was a member of the Demon Slaying Corps during the Sengoku Era. He was the younger twin brother of Michikatsu Tsugikuni, who became a demon, Kokushibo.

Appearance
Yoriichi looks identical to the human form of Kokushibo. He has the same facial features, hairstyle and hair color, and even his Demon Slayer Mark is at the same place as the top of his forehead. However, Yoriichi is slightly more slender and wears a red over a white kimono with a black hakama on his waist. He also has the same hanafuda earrings that Tanjiro Kamado and Tanjuro Kamado have, and carries a katana on his hip as the custom for the Demon Slayers.

In his old age he gained white hair and was blinded by unknown means.

Personality
Yoriichi was a calm and respectful individual. He saw himself as just any other man and no one special. Yoriichi was also noted by his brother to always have had faith in the future and was confident that despite the already overwhelming power the Demon Slayers of the first Breath possessed a generation will emerge that will further surpass their own.As a child. it was shown that Yoriichi deeply loved and idolized his Older Brother Michikatsu and even declared that he will support his brother's dream of becoming the strongest Samurai in the land, and that he would become the second strongest.

When he met his older brother again after so many years, the latter having embraced his new life as a demon, he was deeply devastated and pitied his brother for what he had became, attempting to kill Michikatsu himself in order to stop him.

History
Yoriichi and his twin brother were born into the Tsugikuni clan and became incredibly strong Demon Slayers. Once the two gained their Demon Slayer Mark, he was planning on having a successor, despite his brother believing none could rise to their potential. Eventually the two would part ways and Yoriichi would continue becoming stronger and hunting demons for sixty years. Despite the death sentence of 25 years of life imposed by the Demon Slayer Mark, Yoriichi somehow survived to his elder years, but somehow lost his sight during this time period.

Synopsis
Based on the past memory Tanjiro had from his ancestor, Sumiyoshi and Yoriichi had some sort of relationship, if not a friendship, given that Yoriichi would frequently stop at Sumiyoshi's house for food and tea. It is also implied by Sumiyoshi that Yoriichi saved his life at some point before the birth of his child. Based on the conversation we come to know that Yoriichi had no successor both as a swordsman and in a familial sense. He also seemed mournful, likely of the fact that his brother turned into a Demon, loyal to Muzan.

Abilities and Powers
He is arguably the strongest Demon Slayer and swordsman in the entire history of the series, given that he was the one who cornered Muzan Kibutsuji and had him on the verge of death until he managed to escape. Shortly before his death and at least 85 years in age, he battled his older twin brother, Kokushibo (UM1). Despite his extreme age and apparent blindness, he quickly gained the upper-hand in the battle with a single move, even slitting his throat before he finally died standing up, unscathed. Kokushibo himself admits that if Yoriichi launched a second swing before dying, he would have killed him.

Demon Slayer Mark: A special marking that appears on strong Demon Slayers. Its specific abilities are unknown, but what is know is that it drastically improves the abilities of the Demon Slayer, making them much stronger, faster and able to react quicker then they can achieve normally, though at the cost of being cursed to die at the age of 25. Unlike all other marks users in his era, Yoriichi was able to defy fate and lived to 85 years of age. It is presently unclear why Yoriichi is immune to the Mark's effects. Unlike all other mark users, he is born with this ability naturally.

See-Through World (きる Sukitōru Sekai?) - Yoriichi has the ability to see the "see through world", allowing him to see the muscles, blood flow, and joint movement of his opponents. He can accurately predict and anticipate the movements and attacks of his opponents with this ability. Unlike all others users, he is born with this ability naturally.

Breath of the Sun ({{Ruby|日|ひ}}の{{Ruby|呼|こ}}{{Ruby|吸|きゅう}})
None of the techniques of the Breath of the Sun have been directly shown. However, Yoriichi in his old age is shown to have used it in his battle against Kokushibo 400 years prior to the present time of the story.

Quotes

 * In Chapter 174 prior to dueling his brother with the intent of killing him, he states: "My sympathies, my brother."

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