Genya Shinazugawa is a major supporting character of Demon Slayer: Kimetsu no Yaiba. He is a Demon Slayer in the Demon Slayer Corps and also the younger brother of the Wind Hashira, Sanemi Shinazugawa.
At the time of his debut during the Final Selection, Genya was a short, young man with large, inward-slanting eyes. The space where his eyebrows would've been is constantly furrowed, which gave him a permanently angered appearance. His hair is styled into 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.
During his first appearance, Genya is seen wearing a purple, sleeveless yukata over a plain black shirt with long sleeves.
Later on, when seen again in the Butterfly Mansion, Genya had a much more feral appearance, having undergone a growth spurt that put him at almost six feet tall. 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 he became more muscular and gained many more scars all over his body.
After the Swordsmith Village Arc, his hair gains bright yellow tips.
After becoming a Demon Slayer, his outfit changed to a dark olive-green version of the Demon Slayer uniform, over which he still sported his old purple yukata.
Expert Marksman: Genya possesses exceptional skill in wielding his double-barreled shotgun, effectively utilizing it in battle with both Upper Rank Four and One.
Expert Swordsman: Before he opted to use a shotgun, Genya's main weapon was a short Nichirin Katana, and it was implied that he was decently proficient in using it against demons.
Blood Demon Art
Due to having eaten the flesh and cells of at least two Upper Ranks (Kokushibo and Hantengu), Genya had seemingly developed his own Blood Demon Art while in the heat of battle against Upper Rank One. Similarly to Nezuko's Blood Demon Art, Genya's own were also tailored to battle and do damage to other demons.
Wooden Flesh Bullets: Due to eating the cells of Upper Rank One and Upper Rank Four, Genya had developed a unique technique where he merges his demon-transformed cells with his sun steel bullets and gun, that, when fired, the direction and velocity of the bullets could be freely manipulated by Genya to easily move around obstructions between the bullet and the intended target, as seen when his bullets moved around Kokushibo's sword, directly burying themselves into his flesh. Once inside its target, the bullets can immediately grow into a gigantic tree similar to the tree creatures of Upper Rank Four's Zohakuten form and then entangle and wrap around the intended target, paralyzing them.
Blood Roots: Genya could further alter his embedded Flesh Bullets by having them take root inside his target and suck the demon's blood from inside their body, effectively preventing them from activating their own Blood Demon Art.
Nichirin Shotgun: Genya harbors a western double-barreled shotgun he uses for close and ranged combat proficiently. The bullets he uses are made of Scarlet Crimson Iron Sand and Scarlet Ore, allowing him to kill demons without a blade.
Nichirin Wakizashi: Genya also carries a shorter nichirin sword seemingly being a wakizashi with two hollow ovals that overlap its core and are a dull shade of brown for its handguard.