You might know that Pikachu in the Pocket Monster anime now looks, well, like a changed Pokémon. But this isn't the only instance of different Pikachus.
Recently on 2ch, there was a thread about how characters change and one user posted the following image to show the difference between Pikachu variations. (The image, however, has appeared online prior to this.)
These aren't the only Pikachu variations, but the image does offer an interesting look at how the character can appear slightly different, depending on whether Pikachu is appearing in a game, a comic book, a cartoon, or even a retail shop.