Well, I suggest re-titling this to leader instead of king. The chain of command is found in every organised structure, even in a three man expedition to catalog leafs for a school project, where one is a leader. A leader naturally emerges within any group of any living species with a capacity to do something other than eat and grow and reproduce.
Ants, have Queens, Wolves have an Alpha and so to Apes. Man has various titles for leaders, such as chief, leader, lord, earl, emperor, king, general, captain, admiral, overseer, wise-men, etc.
Hearthlings could have...... Captain of the Expedition, someone who would have a buff and maybe excels at all tasks and has high strength, mind and spirit. On the other hand, it could be funded by some noble lord, who might send a son, a lesser noble or something to go an found an outpost or colony. Maybe they were a gang of adventurers and simply went together and have a chief. Maybe then there may be a council of hierarchy, with 3 leaders who decide together, who would be possessing, one of good spirit, one of good min and one of good strength.
It would had a increased layer of depth I feel, especially with better stats for the leader/s which is better than just renaming them and giving a nickname.
That's my two cents - sorry for the length!