User blog comment:Zathronas/Speculative author: My top 13 Questions for Volume 3/@comment-2.217.222.158-20141026210028

The #1 question is kind of redundant, it's like asking "where did the humans of Remnant come from?", there is nothing to suggest that the Grimm are hellspawn/aliens/other terrible plot twist, they're "normal" animals until the show suggest otherwise.