Kokushibo

When he was human, Kokushibo was known as Michikatsu Tsugikuni, the older brother of the greatest demon slayer of all time: Yoriichi Tsugikuni. As a child, his father trained him, but Yoriichi proved superior. This filled him with such envy that he decided to become a demon to grow stronger. Kokushibo is 400 years old and is the Upper Moon One.

Moon Breathing: Kokushibo utilizes an extremely advanced variant of Moon Breathing, which he developed over centuries as a demon. His techniques generate enormous quantities of moon blades that appear alongside his slashes, making his attacks difficult to predict and dodge.

Before becoming a demon, he was a demon hunter known as Michikatsu Tsugikuni, and thus possesses centuries of swordsmanship experience. His movements are precise, efficient, and designed to exploit any opening the enemy might have.

You can modify your demonic sword, causing it to produce additional blades, extensions, and attacks. This allows you to constantly change the range and trajectory of your attacks.

His perception is extraordinary. His six eyes allow him to analyze his opponents' movements with enormous precision, making him very difficult to surprise.

It doesn't rely solely on brute force. It observes its rivals' capabilities, identifies their strengths, and modifies its fighting style accordingly.

His speed is sufficient to face Sanemi, Gyomei, Muichiro, and Genya simultaneously, adapting to the different styles of each one.

He has a tall, muscular, and imposing appearance.
His skin is pale, characteristic of his demonic form.
He possesses six eyes, arranged in three pairs. The words "First Superior" are written in his middle eyes.
His hair is long, black with red markings, and spiky.
He has dark and red markings and patterns around his face and body. He wears a dark kimono and carries a katana with a demonic appearance. His katana is made of his own blood and flesh, and it also has eyes.

He is extremely serious, reserved, and disciplined.
He possesses immense pride as a warrior and swordsman.
He is cold and calculating, rarely acting impulsively.
He deeply respects those who demonstrate strength and skill.
He is consumed by envy and rivalry toward Yoriichi.
Although he is as cruel as a demon, he retains certain values ​​and his warrior code.