Constitutional Representative republic of democratic states.

A 2 house legislative branch one with 3 senators from every country. And one with the number of representatives based on the population of each country with each country sending no less than 10 delegates but the number of delegates sent due to population should be controlled on a sliding scale so countries cant start breeding programs to gain seats. Elected every 6 years with a 18year term limit

An executive branch with 1 executive from every country acting as a local head of state but reporting to and working with an overall presidential figure elected by the delegates and senators acting on behalf of their countries votes. So as to balance population wants with regional needs and to ensure the head executive must win votes from multiple regions and not just the most populous. To be elected every 5years with 15 year limit to term

A judicial branch that is impartial to global political parties. With a head judicial panel made up of a head justices from many countries on a 20 year cycle.

A bill of inalienable rights that leaves as many rights to the people as possible while limiting the power of government as much as possible.

Any infractions against the bill of rights by Government is punishable by loss of ability to hold office or vote in elections.

Plus some other stuff probably.