Pikachu is Nintendo's best-known Pokémon mascot and Ash Ketchum's first partner in the animated series. It is an Electric-type Pokémon recognizable by its yellow body, red cheek pouches, and lightning-bolt-shaped tail.
In the games, Pikachu is the evolved form of Pichu and can evolve into Raichu when exposed to a Thunder Stone. The character became the anime's central companion because producers wanted a creature that could appeal across cultures and remain expressive without relying on human speech.
Pikachu was not the first Pokémon created, but its visibility in television, merchandise, and promotional art made it the franchise's global symbol. The name combines Japanese words associated with sparkling sound and squeaking, reflecting its electric theme.
Different Pikachu forms have appeared in later games, including costume and partner variants. Despite those changes, the standard Pikachu remains the visual shorthand most audiences associate with Pokémon, especially during anniversary campaigns and crossover appearances.