@star10199 Hi thanks for asking the question. I'm working from triggers in the TV show, that the FSM created Ninjago. As such he would have to create the people within in. I am imagining that some of these were given elemental powers but are essentially still 'human'. There has been no reference (that I know) that Wu and Garmadon have a mother, so I am assuming that they too were created. I think this idea of creation sits well with the Lego concept. I wanted there to be an obvious difference between the 'human' elementals and the Sons of the FSM, as they have been referenced to be hundreds of years old, but the elementals have a 'human' lifespan. So I added my idea that Ninjago was designed to be ruled by a Caste system amongst the elementals, power handed down generation by generation with the sons of the FSM created to enable this and ensure its stability. But this was thrown off by one become Evil and Ninjago has had to develop in a more organic way.
I hope that answers your question and explains my thinking. Its a very interesting concept and great that the programme doesn't spell everything out as law, as we would have nothing to play with!
Personally I like that everything can be traced back to a master builder which is pure Lego.
Best, Rom.