Who is Kokushibo And His Brother 

Nicholas Butler

Who is Kokushibo

Who is Kokushibo? In the Sengoku era, Kokushibo was once human and was Yoriichi Tsugikuni’s elder sibling during the Sengoku period. He was an excellent swordsman and held a respected position within the Demon Slayers corps. As a demon, he lived for approximately 480 years, successfully evading the Curse of the Demon Slayer Mark. 

Who is Kokushibo?

Kokushibo is a prominent antagonist in Demon Slayer, and serves as a significant supporting character. He belongs to the Twelve Kizuki, a group of demons, and holds the highest rank as Upper-Rank One. Additionally, Kokushibo is the ancestor of Muichiro Tokito and Yuichiro Tokito. He is also responsible for transforming Kaigaku, Zenitsu Agatsuma’s senior, into a demon and recruiting him into the Twelve Kizuki.

Kokushibo brother 

Kokushibo brother 

The twin brother of Kokushibo was Yoriichi.  Similar to Tanjiro, he also wore Hanafuda earrings and was known as the first breath user. Yoriichi was the creator of the renowned Sun Breathing style, which served as the foundation for other breathing forms. Despite appearing weak at birth, Yoriichi’s true strength and remarkable emotional intelligence became evident as he grew up.. 

Yoriichi Brother

Yoriichi Brother

The elder twin brother of Yoriichi was Michikatsu, the successor of their family. At first, he felt sorry for Yoriichi because of the discrimination he faced due to his Demon Slayer mark. He saw Yoriichi as inferior and overly dependent on their mother. However, when Yoriichi’s exceptional swordsmanship skills were revealed, Michikatsu envied his brother’s talent, fearing that their father might choose him as the family’s successor. 

Many years later, it is uncovered that Michikatsu is actually the Upper Moon One demon, Kokushibo. Yoriichi confronts his brother about his decision to become a demon, leading to a fierce battle between the siblings. Yoriichi easily overpowers Kokushibo, causing him severe injuries. 


The most formidable demon Kokushibo is easily standing out in the entire series. With exceptional swordsmanship skills, his background within the Demon Slayer Corps is equally exceptional. The brother of Kokushibo, Yoriichi is also a strong demon. Kokushibo remains one of the most captivating figures in the Demon Slayer saga.


How old is Kokushibo?

Kokushibo’s age is over 480 years.

Who killed Yoriichi?

Died from exertion while fighting Muzan.

Who is Muzan?

Muzan is the strongest demon in existence and is the demon king.

Who turned Muzan into a demon?

Muzan turning into a demon was a complete accident.