Okay. There haven't been vampires in the DCAU ever, and not in the DCU since, um, the eighties and a certain Batman arc. There are most certainly demons. Most notably Etrigan, who the Batfamily knows. Also, the legions of Hell do indeed make incursions every now and again - I can show you the relevant pages of the new Green Arrow for DCU-style stuffs, orrrrr...
... in JLU it was mostly. um. Cthonic monster-types.