Kokushibo’s Backstory: Who Is Kokushibo in Demon Slayer? How did Kokushibo become a Demon? and Kokushibo’s Powers and Abilities Explained

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Kokushibo's Backstory: Who Is Kokushibo in Demon Slayer? and How did Kokushibo become a Demon?
Kokushibo's Backstory: Who Is Kokushibo in Demon Slayer? and How did Kokushibo become a Demon? (Image Credit: Netflix)

Last Updated on August 16, 2022 by Joydeep Ghosh

This article related to Demon Slayer ( Kimetsu no Yaiba ) series is all about Michikatsu Tsugikini, aka Kokushibo.

He is not even introduced in the series, but his fanbase is enormous because he is one of the strongest characters in the Demon Slayer series and the most powerful characters in the series.

He is also a manga reader’s favourite character too.

This article will see about him, his past, how he became a demon, and why he became a demon.

Kokushibo’s Backstory: Who was Michikatsu Tsugikini? and what was his relation with Yoricchi?

Kokushibo, aka Michikatsu Tsugikini, was born into a samurai family, but he was not born alone.

He had a twin brother named Yoricchi Tsugikini and his mom was suffering from a disease.

As Yoricchi seemed weaker, his father chose Michikatsu as his successor, so he was trained by the best master in the country.

So he started training, and Yoricchi was watching from a distance.

One day, Michikatsu saw that Yoricchi was looking at his practice, so he gave him the sword and challenged the master.

Surprisingly, Yoricchi defeated his master.

His father heard this news, and he chose Yoricchi as a successor.

Yoricchi always used deep breathing techniques while fighting which he later developed and was known as the Sun Breathing i.e. breathing of the sun (Hi no kokyu)

Yoricchi was aware that his brother Michikatsu was passionate about sword fighting and loved to become a samurai.

Yoricchi wants to see his brother happy at any cost. Because Yoricchi loves his brother so much that he can do anything for him.

But Yoricchi sacrificed his dream for his brother and left home so that Michikatsu can become the successor.

Now Michikatsu has become a samurai and has a beautiful family.

But one day, a demon attacked his house, where Yoricchi came and saved his life.

Kokushibo's brother Yorricchi
Kokushibo’s brother Yorricchi (Image Credit: Netflix)

Now Michikatsu has become more jealous.

He also joined Demon Slayer Corp, but he couldn’t master the breathing of the sun (Hi no kokyu) created by his brother, so he created a new form of breathing which was known as the moon breathing.

And also, his breathing was not durable and was not sufficient to surpass the strength of Yoricchi, so his greed to become strong grew day by day.

How did Kokushibo become a Demon?

As Muzan was aware of Yoricchi’s power, he wanted a partner, so he chose Michikatsu because he was only the person who could give a tough fight against Yoricchi.

And Yoricchi will never kill his brother. So that was an advantage for him.

As Michikatsu had greed for power, he accepted the offer, and Muzan gave him the most of his blood, so he became unimaginably powerful.

Kokushibo's Backstory: Who Is Kokushibo in Demon Slayer? and How Kokushibo Became a Demon?
Kokushibo’s Backstory: Who Is Kokushibo in Demon Slayer? and How Kokushibo Became a Demon? (Image Credit: Netflix)

Muzan had greed for immortality, and Kokushibo had the desire for power.

So for that, the best way was the blue spider lily, a flower which gave Muzan a demonic power and made him immortal. So they created many demons to find blue spider lily and eliminate demon slayers.

Muzan and Kokushibo started killing sun breathing users from every era because they were the only threat to them.

Kokushibo’s Powers and Abilities Explained: What are the powers and abilities of Kokushibo?

Kokushibo is the only demon with blood demon art and mastered moon breathing.

His regeneration, speed and strength are near to Muzan.

He also can regenerate his head, and yeah, he is so powerful that he took down three strong hashira alone.

As he is most loyal to Muzan, as I mentioned earlier, Muzan gave him most of his blood.

That’s why he has become intense.

Mostly in fights, he doesn’t use blood demon art; instead of it, he uses his moon breathing, and the breathing is so powerful that it’s enough for him.

Kokushibo's Backstory: Who Is Kokushibo in Demon Slayer? and How did Kokushibo become a Demon?
Kokushibo’s Backstory: Who Is Kokushibo in Demon Slayer? and How did Kokushibo become a Demon? (Image Credit: Netflix)

Moon breathing has 16 forms i.e. every form of breathing.

He can see through the transparent world. This is the ability just like Yoricchi.

He has six eyes on his face, many eyes on his sword, and his katana is a blade which has alternative blades, which are terrifying to watch.

However, his blood demon art is quite powerful. Like him, he can go through blades which can cut anything and are shaped like a crescent moon.

Even Hashiras was feared because of his look and strength.

He also overpowered Sanemi Shinazugawa, Muichiro Tokito and Gyoemi Himejima when they awakened the demon slayer mark.

As he can regenerate his head, the sun is only the weakness that remains. This satisfies the answer to the question.

Why is Kokushibo the best character in the series?

As he was dying, he felt sorry and guilty for what he had done.

He wanted to make all things right, but the time was gone. Now he realizes that he has left his beloved family, including his brother, wife, and children.

This is the best thing I love about him, and that s makes him the best character in the series.

What and How Is the nature of Kokushibo?

Many fans will assume that Michikatsu Tsugikini, aka Kokushibo is a ruthless person.

But, who has committed many crimes? Yes, he has committed many crimes, but he is not the cruel or lousy person you think.

Though he felt jealous of Yoricchi, he loves his brother very much deep within his heart. He is a person who praises the person who is strong and worthy and also gives them an offer to become a powerful demon and live for centuries.

But he insults those who are weak.

As you know, he is upper moon one and right-hand man of Muzan. But Kokushibo never shows off about this.

Final Thoughts of Kokushibo and The Question He Asked To Yoricchi

Kokushibo (Image Credit: Hoso.wiki)


I could never do good things in my life.

I betrayed my home.

I betrayed my beloved wife.

I betrayed my lovingly children.

I betrayed my father’s dream that they wanted me to be a great man and a great samurai who would protect every person in the country. I killed my descendants. But this was not enough for me.

You said that those who will perfect their ways would end at the same place. But I was not able to do it.

Why was I not able to do it? Why could I not become the person you and our family wanted me to become? Why are we both so different from each other?

Why couldn’t I become a worthy and good person for the world? Why was I born in this world in the first place?

Tell me…..Yoricchi

These were the final words of Kokushibo to Yoricchi.