Gyutaro is a tall man of fairly muscular build, with a pale gray complexion speckled with black blotches. His anatomy was quite strange in that his upper torso, arms, and legs were all defined with musculature, whereas his waist was incredibly skinny to the point of looking skeletal, with his pelvis jutting out at an unnatural angle. His spine was prominently visible through his back, and he was usually shown being hunched over. Gyutaro possessed thin eyes that were slanted drastically downwards at the sides, giving him a permanently haggard gaze. His miotic irises were green with a dark orange center, and his sclera was a bright yellow-orange with visible veins. The kanji for "Upper Rank" (上じょう弦げん, Jogen?) is carved across his right eye, and the daiji for "Six" (陸ろく, Roku?) carved on his left. During his fight with the Demon Slayers, he lends his left eye to Daki and spends the rest of his battle with said eye shut, giving him a permanent wink. He had unruly black hair that transitioned to a brighter lime green around the crown of his head, worn messily in uneven bangs and several locks. His body and limbs had noticeable ink-like markings in the form of black spots on his body and a flowing water-like pattern on his face. He also had a full set of sharp, interlocking teeth. Gyutaro was described to look very ugly.[8] Gyutaro wore little, only sporting a pair of baggy blue pants and seven pieces of pattern red cloth to decorate his body, one large one around his neck and three smaller ones around each arm. (I took this from the wiki, it’s quicker)

Genya is a tall teenage boy with a buzz cut, with only a small clump of messy black hair left to grow on the top of his head. He also possessed a large, jagged scar that ran over his right cheekbone from his ear and to over his nose, along with inward-slanting, and large almond-shaped eyes with purple irises His hair is also much longer, worn in more of a mohawk style, the strands much longer and visible around his neck. It is also noted that his boyish features have toned down, with his physicality now more muscular and gaining many more scars all over his body, a dark olive-green version of the Demon Slayer uniform, over which he still sported his old purple yukata he had as a kid (I took all this from the wiki 😭 and don’t mind the image please)