Um...why can't you fantasize about being Garth and then also separately fantasize about being people who happened to sleep with his sister? That's not an incest fantasy. Just don't fantasize about sleeping with Ayla at the same time as you are fantasizing about being Garth.
John Constantine, Swamp Thing, Shade the Changing Man, Madame Xanadu, Animal Man, and I'm sure some others, were integrated into the New 52 universe. It's not really that they (or the heroes from the old DC or Wildstorm universes) "ported" in; it's that they were rebooted as having been part of the DCU all along (which, of course, they were before Vertigo became its own line). The separate Vertigo Constantine continued to appear in his own Vertigo book, Hellblazer, for a while.but what I like to know is... who was ported from the verdigo universe ?