I will be fixing some of these and reply to some others.
Have you read part of the Story of a Minifigure? Ah, yes, I think you have. Don't worry, you don't need to have read it to understand this.
Concerning the original Chaos: this is inspired by ancient greek mythology, where it's said "At the begininnig, there were was chaos" and I believe that by Chaos greek mythology means something like what I described. Also, bear in mind that these are but the philosophical opinions of the Figorani/Deofan's. Despite their great wisdom, it's not necessary it's the absolute truth.
Greater diversity means to say that new things the Figrithen had not imagined were created through the clash of Ithen.
I have a problem with commas, sometimes adding more than I should, sometimes being afraid of this, removing commas that I shouldn't! :P
Minifigures are not the human equivalent of the Lego Universe. You see, there are alien minifigures, elf minifigures, dwarf minifigures, etc. etc. By using the term of minifigure, you can't refer to a particular species, but a series of them. One of those species, either the main one or at least the onr our stories are about is that of humans. Despite their minifigure characteristics, our heroes remain humans. They are human minifigures.
Master Builders are one of the Figorani's ranks. There also are Apprentice (like Beolin), Junior Builder, once you have passed the trials (though I'm not sure if I'll actually use the idea of trials; too Jedi-ish! :P) to become a Builder. These are certain ranks, but there might be more.
Thanks for the feedback, N_B! It's really appreciated. I hope you enjoy the story in general.