As he can regenerate his head, the sun is only the weakness that remains. This satisfies the answer to the question.
Why is Kokushibou 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 Kokushibou?
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 Kokushibou and The Question He Asked To Yoricchi
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?
These were the final words of Kokushibo to Yoricchi.