The Horned Demon has shoulder length black hair, with a center split and a single horn in the middle of his forehead. He has distinct red eyes with vertical pupils, slanted in an upward position, as well as thick protruding lips.
The Horned Demon has a generally large physique with visible veins displayed on the majority of his body. During his short appearance, he can be seen wearing green hakama pants with a brown vest.
The Horned Demon is prideful and confident, as seen when he showed no hesitation to attack at the sight of Inosuke, even boasting about the fact that he'd soon taste Inosuke's flesh and sarcastically complimenting his attack. However, his pride and lack of caution quickly became his downfall as he underestimated Inosuke, showing a lack of ability to properly size up his opponent before fighting them.
Nothing is known about how the Horned Demon became a Demon or for how long he has been a Demon.
Before his first appearance, he and the Tongue Demon got into a fight with Kyogai over who would get to eat Kiyoshi due to his Marechi blood. During the fight, the Horned Demon managed to rip off one of Kyogai's tsuzumi, which Kiyoshi quickly grabbed and used to teleport to safety, most likely separating the three Demons as well.
The Horned Demon was killed by Inosuke Hashibira.
Enhanced Strength: The Horned Demon was able to rip out one of Kyogai's tsuzumi from his back, which would have taken a large amount of strength. He is also shown to easily crush hard wood simply by grabbing it, seen when he tried to grab Inosuke.
- Kimetsu no Yaiba Manga: Chapter 23 (Page 15).