Are there any special documents needed to enter Japan as a single, fully custody, parent of a 16 year old minor?
We will only be in Japan for 7 days on a tourist visa.
I've checked here and can't seem to find any information on the subject.
After some quick searching, I wasn't able to turn up anything specific either. However, Japan now does subscribe to the Hague Convention. This assumes that the minor child has a passport and that the other parent is alive. So, to be safe:
Whether or not that's possible:
Notarized copy of decree giving you sole/full custody.
A court order allowing you to take the child out of the country.