My theory is that Caine is the one who made the Digital Circus, and he wanted to be the ruler of his own world. Maybe he felt lonely, then made NPCs, but he still felt lonely, then decided to trap players in the game so he could have real people to talk to. I gotta share one opinion, though: Pomni is just super cute! I'm not sure if anyone feels the same about her, so if any of you are Ragatha fans, then please don't get mad.
I know its not canon but I found it to be an interesting origin story of all the characters we've seen. Only time will tell if Goose works will give us the orgin to Pomni and co.