
According to Fujiwara, he "wanted to create a blank slate Pokémon." Drawing upon his vague childhood memories, including an instance where he became lost in a forest and "encountered an indefiniable creature," Fujiwara would go on to create the early design for Eevee, which he likened to "a fluffy cat or dog-like creature one would see in the country." Ken Sugimori, an illustrator and friend of the Pokémon franchise's creator, Satoshi Tajiri, provided illustrations of Eevee and its evolutions after seeing Fujiwara and Nishida's sprites. The design for Eevee and its evolutions Jolteon and Flareon were provided by Japanese graphic designer Motofumi Fujiwara, while fellow graphic designer Atsuko Nishida designed Vaporeon.

Five more evolutions have since been introduced in Pokémon games: Espeon, Umbreon, Leafeon, Glaceon, and Sylveon.

The first three of these evolutions, Vaporeon, Jolteon, and Flareon, were introduced alongside Eevee in Pokémon Red and Blue. Known as the Evolution Pokémon in the games and the anime, Eevee has an unstable genetic code, which allows it to evolve into one of eight different Pokémon, known as Eeveelutions, depending on the situation. It would become the game mascot and starter Pokémon for Pokémon: Let's Go, Eevee! It has later appeared in various merchandise, spinoff titles, and animated and printed adaptations of the franchise. Created by Motofumi Fujiwara, it first appeared in the video games Pokémon Red and Blue.

