I would believe that he was living in Japan at the time of Bitcoins creation and possibly is still, because at that point in the game why would you have to lie about what country you live in?  (Why not put your location as Berma?)

I am extremely skeptical that he is in fact Japanese. Japan is home to many contractors, especially in tech industry, who come from abroad. Japan is always looking for Americans who speak Japanese. (Still possible he could be ethnically Japanese but definitely raised in the west)

Combine that with the type of prerson who would create such a technology: Hacker, Anarchist, Free Thinker - and you have the profile of bright young man - possibly American, British, or Canadian (the English is too good) - who had the opportunity to Study abroad, possibly had family there.

So he was living in Japan, working at a tech firm or software developer and tinkering with this "Bitcoin" idea. You can't deny the connection between the August 15th patent filed by Neal Kin, Vladimir Oksman, and Charles Bry and then bitcoin.org registered three days later.

I feel pretty confident that they were part of a collective, working on Cryptographic transactions. This is not to imply that bitcoin was created by a group effort but rather developed independently by one of the members.

At some point the creator showed his collaborators his proposal. When they realized what they had - they stopped everything. They realized that if they continued that one change needed to happen:

It has to be created by a ghost: A pseudonym was created by the collective to mask the original creator. Satoshi as you think you know him doesn't exist. He was a guy, he made a code that the collective helped tweak, innovate, and implement. His involvement after that was just as much, maybe a little more than his collective - who were still free to work in the shadows as long as he assumed fully responsibility of the system.. This way instead of a hacker group getting busted you only have one guy who can easily erase his existence with the click of a button (should the option be needed). Everyone involved had to not be involved: A plan was set forth within the group to distance themselves from Satoshi and make it appear to be a mysterious hacker who acted alone. This would free up the members of the collective to work on Bitcoin while denying a link to Satoshi.

Where is he now? I don't know but if my theory is correct - you can find the collective by looking at people really early in the game that deny having a link to him AND can prove they don't have a link to him because that's how they set it up.

So basically everyone.