Pikachu is substantially bigger than all other video game characters, including Mario. But it isn't because of the video games at all. I mean, practically no one associates recent Pokemon games like Black and White with Pikachu.
It's just that the anime/movies of Pokemon are a pretty big deal right now and were an enormous deal up until a few years ago. Through the anime, Pikachu is probably very well-known to huge audiences that know nothing about gaming in places like developing countries.
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