Pikachu is the mascot Pokémon from the long-running Pokémon franchise, which began in the 1990s and became globally known through games, anime and merchandise. Short Pikachu vocal sounds spread widely online because the character is instantly recognisable even in very brief clips. Creators keep using happy Pikachu reactions in memes, edits and streamer posts because the sound communicates excitement and innocence almost immediately. Its staying power comes from that mix of nostalgia, cute character appeal and the huge reach of Pokémon across generations.