This is just a recommendation:

Why not have one ruler for each kingdom at the start (looks like we have three Queens thusfar and the mysterious King of Lucifer in Furnia's story to complete the Lucifer rulership). During the RP should any romance come up with one of the rulers, the character that they decide to marry/be involved with could become the "High Consort/King/Queen"? 

Another thing we could do to curve the amount of people needed, is to limit all of the kingdoms to one Prince or Princess, as well as limiting it to one Knight, one Bishop and two warriors per kingdom? Might help expedite the process?