Webthe flesh katana is red and has eyes covering the entire surface of the blade. Although koyoharu gotouge does not mention that those eyes extend. Webthe specific name of kokushibo’s demon art is unknown, but it was this ability that allowed him to use some of his flesh and make the katana that he uses in. Kokushibo has the upper hand on this ability since he can also create his. Webkokushibo’s three pairs of eyebrowless eyes, each with a yellowish iris and a segmented crimson sclera, were his most distinguishing characteristic and,. Webat first glance, kokushibo’s eyes may appear sinister and unnerving. The eerie crimson hue and penetrating gaze have the ability to send shivers down your spine. Webif your design as a demon is random, and decided by the random mutations you recieve from merging with muzan's dna, then that's the answer. If not, and muzan gave. Webit is highly possible that kokushibo manipulated his flesh and decided to have 6 eyes to have better vision. Having more eyes would mean that the brain has. It's hard to discuss kokushibo without delving into the deeper lore of the series or mentioning the consequences of his battle with the demon slayers. Webone person suggested that the method used to give him six eyes was similar to the way that a yoriichi puppet was crafted with six arms.