Despite his young age in comparison to his Hashira brethren, Muichiro is an incredibly talented and skilled member of the Demon Slayer Corps, who was noted by the Flame Hashira Kyojuro Rengoku to be more skilled than he was at his age.[4] Even before becoming a Demon Slayer, he was able to completely overpower a demon using only wooden stakes and farming tools.[5] He has the astounding feat of becoming a Hashira a mere two months after picking up a sword,[6][7] a feat that would normally take five years of training for the average person and at best two years,[8] which earned him the praise of the Sound Hashira Tengen Uzui. After gaining his Demon Slayer Mark, he was able to engage Gyokko, the fifth highest ranking demon of the Twelve Kizuki, in combat with little difficulty, eventually killing him even after he had transformed into his true form.[9] His fighting prowess was also commended by Kokushibo, the most powerful member of the Twelve Kizuki, and played a major role in the Upper Rank's defeat in spite of his lethal injuries.[10][11]
Endless Rage:[12] Muichiro attributes the origin of his willpower towards training and his strength towards the awakened rage that is always present and boiling within him, both appearing after his brother's death. This unquenchable rage is the source for his indomitable willpower and undaunted spirit, shown when he continued to fight despite having beyond fatal injuries, such as having his arm, both his legs and later his entire torso sliced. Despite everything, he remained steadfast which ultimately was pivotal to the defeat of Upper Rank One Kokushibo
Demon Slayer Mark: During his battle against Gyokko, Muichiro's body reached the requirements to unlock the Demon Slayer Mark, which manifests as three dark red clouds on his face. 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.[17] Later on, in his battle against Kokushibo, Muichiro manifested his Mark at will in order to fight the Upper Rank. [18]
Bright Red Nichirin Sword: During his battle against Kokushibo, Muichiro dyed his Nichirin Sword a bright red color by gripping it with all his might, allowing him to hamper the regeneration of Kokushibo, which later proved to play a pivotal role in his defeat.[16]
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.[10]