Well obviously no one knows... or very few people know (I still think that there are a couple original bitcoiners on this forum who are 99% sure that they know who Satoshi is).
Whats your favourite theory?
Mine is that it was John Nash

Please provide some proof for your theories. Would love to look into them!
According to Wikipedia it was an unknown name used by a person or people who created bitcoin and designed it. Who knows he is really the real one because we know that Japan is an advanced and high technology country.