There will be strains. The remaining kings are free game for those who want one of them. Just ask. 
Nobody is required to be a king. But there may be another taker or two when the OOC starts. 
Also Nicias, you know... The manga and novels and stuff made for this are nearly all prequels right? Unless there's one i do not know about.

EDIT: I forgot... I'll try to have the OOC up tomorrow a little later in the evening. With classes I was a bit busy, but after a test tomorrow I'll have more or less more time.