I can't explain it to ya but...
But, Voidpunk is more or less a community of people not necessarily of the LGBTQ community that accept dehumanising of one self, often portraying oneself as say; An Eldritch Horror or a Biblically accurate angel to something along those lines, it's often surrealistic but think of it as rejecting ones Humanity and embracing the surrealism of life itself.
Therians, well...I would say are similar to furries but I'll let the Therians explain it.