I'll allow one or two more roleplayers.

As stated in the rules older classes are allowed within reason things like Emperor, archsage, etc are not allowed. Shamans are allowed but I'm not sure why you'd want to go pure dark when dark mages can use anima and dark. I suppose druid's healing factors could be useful. Summoners I'm not too sure about not sure how'd they'd work Need some valla shit.

Please read the rules it should answer your question in whole.