Pikachu is a cubedude from Cubedudemania and in it's subtheme, Cubedudemania Extra. He is a character from Japanese cartoon, Pokemon.
Pikachu is a small type of electric Pokemon, and evolution to Pichu. He is Ash Ketchum's best Pokemon. He refuses to go into Pokeball. In early years of his life he was fat, but now he is skinny. He can perform a lot of moves like Thunder attack.