No problem!

So you're all probably wondering: "Where is the demon species for DL?" well to answer your question simply. There is none! That's right, there is no "pure demon" race for the DL world, since Diabolik Loovers does not use any religion to it explicit detail ( save for Yui going to the church and praying ). The demon world acts more like a seperate world, much like the real world and the countries,  with a working monarchy to rule over the others. Colloquially, demon world is much like the Underworld in most cultures-- a different realm all together. You're born in the demon world, that makes you a demon. 


That's really it, easy peasy.