This Muzan Kibutsuji vinyl figure is released by Funko in their POP! Animation x Demon Slayer vinyl figure series.
Funko POP! is a crossover vinyl figure series by Funko and other famous franchises such as Disney, Pixar, DC Comics, Marvel Comics, Simpsons, South Park, Uglydoll, etc. Each POP! figure is about ~3" to ~5" tall and crafted in a Japanese anime/manga super-deformed style (NOTE: due to the unique design of each character, the actual size of the figures may be smaller or bigger than stated).
The POP! Animation x Demon Slayer features characters from the popular manga/anime, which follows teenage Tanjiro Kamado, who strives to become a demon slayer after his family was slaughtered and his younger sister Nezuko turned into a demon