This The Joker figure is released by Funko in their POP! Heroes x DCeased Mini-Figural Keychain series.

POP! is a crossover vinyl figure series by Funko and other famous franchises such as Disney, Pixar, DC Comics, Marvel Comics, Star Wars, Simpsons, South Park, Uglydoll, etc. Each Pocket POP! figure is about ~1" to ~1.5" 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! Heroes x DCeased series features characters from famous super heroes / villains from the D.C. universe , such as Aquaman, Batman, Flash, Green Lantern, Joker, Superman, Wonder Woman, etc.

DCeased is a six-issue comic book miniseries published by DC Comics from May to October 2019. It was created by writer Tom Taylor and the artistic team including penciler Trevor Hairsine and inker Stefano Guadiano. The story takes place in an alternate Earth, where a corrupted version of the Anti-Life Equation has infected most of Earth's inhabitants with a zombie-like virus. Lois Lane acts as the series' narrator, detailing how the events took place over the course of a few weeks.