yes if hes not japanese.
If you are a citizen of a country whose citizen do not need a visa to visit Japan, then you are fine; Green card does not waive visa requirement for Japan.
For a visit of 90 days or less, only a valid passport and return ticket are required.
No, a visa is not necessary, as Japan is in the visa waiver program, but that would require an ESTA from you.
Yes
no
Yes, an Iraqi citizen can visit the USA, but they typically need to obtain a visa before traveling.
Yes, Canadians need a visa to visit Japan for tourism or short-term stays.
Yes the man from China will need a visa to visit the U.K.
No. The passport is all you need.
No. All you need is your passport.
A passport.