Hi,
Situation:
In Ukraine we have some regions with unique population patterns, that differ from other ones. I.e. there are several cities (Kyiv, Dnipro, Kharkiv) with big univercities, which attract lots of african students (pattern formed by USSR). Part of them stay in thise cities and then their children may appear in junior teams (with UA passport but names/sonames non-typical for Ukraine) or some of these students may appear in amator teams (in Dnipro there was even an amator team FC Legioner that mostly consisted of emigrated from African countries). At the same time in majority of Ukrainian cities chances to see smth like this are close to 0.
At the same time in Zakarpattya region every second person has hungarian roots (and 2nd passport). They know hungarian language in addition to ukrainian and Hungary has lots of their prgrams running there to support hungarian-rooted.
I'm sure that such pattern unique for separate cities/regions inside the country can be found in other parts of the world as well (mostly due to emigration patterns, when enclaves of emigrants from specific country are created in some region of the target country pr due to historical borders change, when some region belonged to different country, or just intensive exchange with nearby regions of other countries). So it would add some realism if researchers can set that i.e. teams based in Dnipro city would have ~5% chance to have african regen with UA passport, teams from Uzhorod (Zakarpattya region) will have regens with 50% chance of hungarian second nationality, while teams i.e. in Chernihiv have none of it.