Eievui, internationally known as Eevee, features as a central character in the Pikachu short "Pikachu to Eevee Friends." It inhabits the Eevee House alongside its evolved forms—Vaporeon, Jolteon, Flareon, Espeon, Umbreon, Leafeon, Glaceon, and Sylveon—with Sylveon hosting a sleepover party where the story unfolds.

Exhibiting a playful and energetic nature, Eievui rushes excitedly to greet visitors Pikachu, Oshawott, Axew, and Pansage, accidentally crashing into Axew. It quickly recovers, engaging in friendly interactions and demonstrating curiosity and sociability by initiating lively games of tag with Axew and Jolteon throughout the house. Its exuberant movements often involve running and tumbling during play.

Eievui actively facilitates connections among the group. It shares a significant moment encouraging the shy Flareon to overcome timidity and join the fun. During explorations of the Eeveelutions' living spaces, Eievui's participation in chases causes inadvertent disruptions, like disturbing Leafeon's rest, highlighting its lively and occasionally impulsive character.

The character fully engages in party festivities. It attends the communal feast prepared by Meowth and Wobbuffet, observes the talent show featuring dances by Leafeon, Espeon, and Glaceon, Oshawott's water techniques, and Pansage's mimicry act. Later, it witnesses Umbreon's surprise cosmic light show finale alongside Gothitelle, Weavile, Gible, Gothita, and Gothorita.

Physically, Eievui remains in its unevolved form throughout the short. Its design adheres to standard species traits: a quadrupedal mammalian body with brown fur, a bushy cream-tipped tail, a cream neck ruff, round brown eyes, long rabbit-like ears, and pink paw pads, maintaining consistent depiction.

The story concludes with Eievui resting in a communal sleeping area alongside the other Pokémon. It shares a mutual smile with Sylveon before sleeping, signaling their close bond. Playful interactions resume the next day, as depicted in the credits sequence.