Condottiere
Emperor Mongoose
It is quite possible to have a representative democracy even in a one-Party state. Any Solomani citizen can register as a Party member. As long as the basic concepts of the Solomani Cause remain sacrosanct, anyone can join the Party and through it run for an elected office. A world government can have multiple political parties so long as all of them are members of the Party. Thus the world is governed by the Party but the population get to decide what aspects are emphasised and what policies are followed – or at least how they are followed. Even if there is only one Party, multiple candidates can stand informally to represent the interests of particular factions, interest or regions. In worlds with this sort of government there are few barriers to entry into politics aside from money.