I like to think of this as the mediclorians of the Bionicle Fandom, because this idea of mine will try to explain away how Bionicles could ever exist on earth among us normally.
Basically my idea for the back story of how this world would come into being is as follows:
"In the year 200 BC, the great spirit robot would crash into Earth and lay still due to Teridax's virus. 2215 years later, humans and the Bio-mechanical creatures that emerged from the Great Spirit Robot have come to live along side each other over the course of time. Because of their arrival on Earth, the culture and population are drastically different from the earth we know today- Humans wear Kanohi(Eljay for example), Matoran and Turaga hold jobs as teachers and PhD's in things. Skakdi, Zyglak and all manor of Rahi roam the less populated places of earth, Toa serve as the international defense force for the world and work to keep the peace."
I actually plan to use this fictional world as a setting in my future project, but I don't knooooooooooow- Maybe you'll think this is a silly idea. That's why I'm making this topic so you may feed me with feedback.