While the flail and axe allow Himejima to make the most out of his skillset and strength, the chain allows him to sense the enemy’s moves and position. While the mark is active, his vitality, speed, and strength are greatly enhanced, to the point where he not only shrugged off the effects of a powerful paralytic poison and used Mist Breathing forms in rapid succession, but also was capable of singlehandedly overwhelming and killing Upper Rank Five of the Twelve Kizuki. This pernicious power adds one more layer of awfulness to his all around impressive battle capacities. After being decapitated by two marked Hashira, Kokushibo is able to regenerate his entire head and successfully conquered death from a decapitation via Nichirin Swords, [31] a feat considered impossible for demons and only accomplished by two other demons: Akaza and the Demon King himself.

However, he was shown to be more aware of himself and those around him, evident when he realized that Obanai Iguro had a crush on Mitsuri Kanroji, which surprised Gyomei Himejima. Kanroji’s Demon Slayer sword defies the traditional conventions of swords, but it somehow works out well for her. Muichiro even remarked that Kokushibo's speed was in another dimension compared to his own, despite his abilities being amplified by his Demon Slayer Mark. The volatile nature of his Blood Demon Art makes it extremely challenging for Demon Slayers to circumvent.

Extrasensory Perception: Kokushibo can detect the presence of others outside his normal range of perception, as shown when he dodged Genya's gunshots and appeared directly behind him despite Kokushibo looking at the opposite direction. As a human, Kokushibo's look was almost identical to his demon form, except for the amount of eyes, his eminent eyebrows, and less light skin. His skill with this Breathing Style impressed Kokushibo, who implied that his proficiency in this swordsmanship style was beyond his expectations. He is an adamant rule-follower, punctual, and he shows a great deal of respect to the hierarchy of the Twelve Kizuki, as seen at the Upper Rank gathering.

Along with this, the lack of bands of cloth wrapped around his calves gives his uniform an overall loose and sizable appearance. In Demon Slayer manga Chapter 77, we learn that no demon survived the cleaver’s destructive blow before the Upper Rank 6.

While he chose the life his brother stood against, Kokushibo didn’t leave his swordsmanship behind even after becoming a demon. After being beheaded by Sanemi Shinazugawa and Gyomei Himejima, Kokushibo evolves into a more grotesque and monstrous form, with protruding fangs and mandibles, large white horns on the front and and back of his head, pointed nails, red outgrowths on his face, his pupils looking at different directions, shorter and messier hair, several thin tubes poking out of his body, and numerous black and red scorpion tail-like appendages haphazardly sprouting all across his entire body.

A new demon slayer first has to pass the Final Selection test, after which they get to choose their ore of choice for the sword, and then only do they receive their weapon.

Kokushibo's swordsmanship is further empowered with the development of his own Blood Demon Art, which greatly improves the lethality and power of his techniques, making every single one of his sword swings incredibly deadly. When he uses his brother's shotgun to shoot at the Upper Rank, Kokushibo is quick enough to block the pellets even when it was fired point-blank. Transparent World: Muichiro obtained the ability to see the Transparent World during the midst of his battle against Kokushibo, which allowed him to see the muscles, blood flow, and joint movement of his opponents, aiding him in landing a hit on the Upper Rank and keeping him in place and creating an opportunity for his allies to kill him.