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|“||How old he was... My brother was still a human, and I felt pity for him at heart. However, I didn't feel rage. Even though my brother was so obnoxious when he was sixty years younger, he called me "elder brother" in such a deep tone. For the first time, I saw my normally stoic brother shedded tears. I was shocked by such an unexpected expression. I must kill him. I must kill him when he was still frail. He was an old man, no longer in his prime. He was my hunter. If he raised his sword at me, I shall be cut in half. I know I wasn't making any sense, but I thought he might begone in the next second.||„|
|~ Kokushibo's thoughts when he saw Yoriichi's tears|
Kokushibou (黒死牟) is the secondary antagonist of Demon Slayer: Kimetsu no Yaiba anime and manga as he is the strongest members of Twelve Demon Moons, being the Upper Moon One and the archenemy of his younger twin brother, Yoriichi Tsugikuni.
It was also revealed that he is also the ancestor of Yuichiro Tokito and the Mist Pillar, Muichiro Tokito before becoming the strongest of the Upper Moons and the right-hand man of Muzan Kibutsuji.
His real name is Michikatsu Tsukiguni (継国厳勝) who is the elder brother of the first Breath of the Sun user, Yoriichi Tsugikuni, and it's speculated that he is also a member of the Breath Users because of his skills of the Breath of the Moon.
Kokushibo's physical appearance shares a striking similarity with Yorichii, his own brother. He has long black hair of which he kept as a ponitail. Before his turning point, he shows no difference to normal human. However, after becoming a demon, his appearance significantly changed, with his face covered in three sets of yellow eyes with red sclerae, with six eyes in all.
Mysterious, composed, grim, serious and yet somewhat honorable, Kokushibou is a serious person who loves to fight, and never plays around. He is also the most loyal enforcer of Muzan's Upper Moon system, willing to punish Akaza for breaking the rule and attack Douma, though he does suggest Akaza to fight Douma and earn his place if the latter really disgusts him.
Despite being a demon, Kokushibou relies more on his swordsmanship and Breath of the Moon techniques rather than using the supernatural Demon Blood Arts. His past also revealed himself to be a distraught and broken man who was sad over his shortened lifespan and with a great fear of death, as well as a grudge born out of jealousy towards his younger brother to the point of making a notion to kill him.
In spite of his cruelty, Kokushibou is also an honorable person who gives respect to opponents he considered worthy. He is more prone to making humans into demons if he considered them to be worthy of use or being respectful warriors with a sad past, and unlike Muzan and Douma, it was suggested that he genuiuely valued their strength and sees them as birds of a feather to himself.
Even so, deep down, he was a broken man who was feared of his own demise and was deeply jealous over his brothers' survival even with his mark, and he will hunt him down and kill them because of such jealousy.
|“||Wonderful. The perfect physical form developed to the utmost. How long has it been since I've set my eyes on such a great swordsman, perhaps 300 years?||„|
|~ Kokushibou complimenting Gyomei's peak physical condition|
|“||You merely shredded my kimono, not even enough to kill an infant. Once I dispatch you two, the rest will proceed easily.||„|
|~ Kokushibo as he revealed his evolved blade|
|“||You came Demon Slayer. For some reason, hmm? You, you seem familiar.||„|
|~ Kokushibou to Muchiro|
|“||Be thankful for the blood... You are not allowed to spill even a single drop on the ground... for if you do... your torso and head shall have a sorrowful parting.||„|
|~ Kokushibou to Kaigaku|
|“||You opened a path... to reach further heights... and you abandoned it... Very weak.||„|
|~ Kokushibou in response to Akaza's demise|
|“||Have I lived hundred of years for this?... Was I so afraid of defeat that I became a monster?... Did I want to be strong even if it meant eating people?... Did I become this miserable creature because I didn't want to die?... No... Yoriichi... I just... I wanted to be like you...||„|
|~ Kokushibou's thoughts as he started slowly dying|
|“||What is the meaning for me to be brought up to this world? Answer me... Yoriichi...||„|
|~ Kokushibou's final thoughts|
- Breath of the Moon Style swordsmanship used by Kokushibou is likely to have been corrupted from its original forms since Kokushibou as a Demon has an ability to use Blood Demon Art. Blood Demon Art and Total Concentration Breathing Styles can be used together with an enhanced effect.
- Part of his name, Kokushi, means "Black Death".