Let's say you have a magic based around renaissance world, where the individuals can have a almost godlike powers. Because of that, every structure is either a monarchy or a theocracy.
The standard, plutocracy wouldn't work, because if any member of it becomes stronger than the rest, the "democracy" will crumble.
How can the democracy become feasible in such strength based world?
Democracy is the same with every form of governance in the world. It is an illusion backed by power. The only difference democracy has with other government type such as Autocracy for example, is that it lets those without power have a say. Even so, those in power determines who have the rights to democracy.
For example, in ancient Athens, only Athenians have the right to vote and not all Athenians may vote. In Rome, only a senator may vote, but the common people may not, at least in the later republican era. This does not come naturally. Democracy doesn't just appear out of thin air and suddenly a bunch of people can have their voice heard. It must be in a climate stable enough that the power that be can afford to exercise the ability to listen to the voice of other people.
So for democracy to be feasible, there must be a sponsor for that ideology. A sponsor could be any number of people, from all walks of life, that subscribes to the idea and pledges to protect the idea. An easy example would a council of sort where a bunch of strong people guarantee a minimum amount of living standards for those below them. Another example is a single person, more powerful than most who pledges to protect his people and let them govern themselves.
You can read the manhua (well, this was before the term manhua existed) called Sea Tiger. It's a story of a bunch of people so powerful they could punch the moon with the power of a thousand nuclear bombs. These powerful people chose to protect or rule over a bunch of powerless people, whether it be due to compassion, arrogance, sense of achievement or just plain on a whim. Democracy doesn't have to be a republic like America. Democracy can just be a bunch of people with equal say who rule themselves under an overlord.