Which voice actor has primarily voiced Pikachu in the Pokémon anime?

Ikue Ōtani has primarily voiced Pikachu in the Pokémon anime.

Ōtani has performed Pikachu's voice since the character's introduction in the television series. Unlike most Pokémon voice roles, Pikachu's voice was kept consistent across language versions, allowing the character's signature “Pika-Pika” sounds to remain recognizable worldwide.

In the anime, Pikachu generally communicates by repeating variations of its name rather than speaking ordinary human language. Ōtani's performance gives those repeated sounds different emotional meanings, including excitement, fear, anger, and affection.

Other actors have voiced Pikachu in particular projects or language adaptations. Ryan Reynolds voiced Detective Pikachu in the 2019 live-action film, while Ōtani voiced the character in the Japanese version of that film. Those performances do not change Ōtani's longstanding association with the main anime Pikachu.