Holy wow this got some feedback!

The idea of your characters coming from SOME realm to Earth serves as a starting point. Earth will serve as like the training grounfd, I guess? Since your characters will be pretty much new to the cause. It also can help build characters; were they hella famous/nortoious back home? Were they a powerful fighter/wizard? How did they get to Earth? 

Basically it’s a way of developing characters haha