Passports, Geneology, VivoKey / Spark
There is a country called Liberland - It would be interesting to see you coordinate with them on Citizenship / Passports / Land Holdings / Documents etc.
Follow on with the rest of the Nation States and Countries for Document Handling.
DNA would be nice to see foelike Genealogy before you Date Someone you can see how closely related you are. Especially for the people that where adopted and they have know record of their biological parents.