This Mera vinyl figure is released by Funko in their POP! Heroes x Aquaman 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! Heroes x Aquaman series features characters from the superhero film based on the DC Comics character of the same name. It is intended to be the sixth installment in the DC Extended Universe (DCEU). In Aquaman, Arthur Curry, the heir to the underwater kingdom of Atlantis, must step forward to lead his people against his brother, Orm, who seeks to unite the seven kingdoms against the surface world.