Akaza is a complex, battle-obsessed Upper Moon Three demon with a deep-rooted obsession with strength, holding intense contempt for the weak while respecting powerful opponents. He is stubborn, competitive, and follows a strict moral code, refusing to kill or eat women. His demeanor is shaped by a tragic human past. Akaza is a muscular demon (Upper Rank Three) with short, spiky bright pink hair and pink sclera with yellow eyes featuring pink lashes and the kanji for "Upper Rank" and "Three". His skin is white-green, covered in intricate, symmetrical blue lines resembling criminal tattoos. He wears a short, sleeveless pink vest, baggy white pants with a blue rope belt, and ankle beads.

Douma (Upper Moon Two) is a charismatic yet profoundly nihilistic and emotionless sociopath who masks his apathy with a constantly smiling, friendly, and carefree demeanor. As a void-hearted individual from birth, he fakes emotions to blend in, acting with extreme sadism and apathy while viewing human life as meaningless, often "saving" followers by eating them. He only eats women, since they’re more nutritious than men. Douma is a tall young man of muscular build. He is of extremely pale complexion and possesses long, pointed nails that appeared to be stained with a pale purple. Douma was born with beautiful and rare rainbow colored eyes. He possesses long platinum blond hair that he wore parted to his right, the shorter parts around his face seeming to flare out to either side around his head, curving backwards with one lock slanting down to the right of his face to fall between his eyes, while the longer parts were left to drape centrally down his back in a thinning spiral.

Kokushibo, the Upper Moon two demon, is a tall, muscular, pale-skinned man with six eyes arranged in three pairs, featuring yellow irises and red sclerae. He wears a purple and black hexagonal-patterned kimono and has long, spiky black hair with red tips tied in a ponytail. He wields a fleshy katana with eyes and veins. Kokushibo, Upper Rank One in Demon Slayer, is a stoic, honorable, and intensely disciplined demon. Unlike others, he acts like a serious warrior, prioritizing swordsmanship over demon blood arts. He is loyal to Muzan, yet driven by deep-seated jealousy, fear of death, and a long-standing, obsessive inferiority complex regarding his brother, Yoriichi.