Countries

They have human bodies and everything is like people, only the skin is painted in the color of the country's flag, that is, it is a flag on the skin all over the body.

Australia;
Angola;
Andorra;
Argentina;
Armenia;
Belarus;
Benelux;
Benin;
Bulgaria;
Bolivia;
Brazil;
Burkina Faso;
Vatican;
Hungary;
Venezuela;
Vietnam;
Guyana;
Honduras;
Italy;
Cape Verde;
Kazakhstan;
Kyrgyzstan;
Comoros;
Côte d'Ivoire;
Cuba;
Lebanon;
Liechtenstein;
Mauritius;
Madagascar;
Malawi;
Mali;
Morocco;
Mozambique;
Monaco;
Mongolia;
Myanmar;
Namibia;
Niger;
Nigeria;
New Zealand;
Norway;
United Arab Emirates;
Portugal;
Rwanda;
San Marino;
Sao Tome and Principe;
Seychelles;
Senegal;
United States of America;
Somalia;
Union of Soviet Socialist Republics;
Sudan;
Sierra Leone;
Tanzania;
Togo;
Tunisia;
Turkmenistan;
Uganda;
Central African Republic;
Chad;
Montenegro;
Sweden;
Equatorial Guinea;
Eritrea;
Eswatini;
Estonia;
Ethiopia;
Republic of South Africa;
South Sudan.

It is possible that the genre in question was Countryhumans (also known as "Country People" or "Country Humans").
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It is a fandom in which countries are depicted as spherical anthropomorphic creatures painted in the colors of their national flags.
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Besides countries, the Countryhumans genre can include republics, cities, various organizations, websites, and celestial bodies. Each has its own character, preferences, and interests, depending on their nationality. And each country has its own parent countries from past centuries.
They are all men. [But it depends on your choice.]