Not sure if ICE/MERP did anything with these individuals or if they made them into Maia--but if they did so, then Danuin, Fanuin, and Ranuin would not only be Maia, but they would be Maiarindi as well. It is unknown if MERP actually used these characters, but given that they are Ainur who exist in Arda--GM's may use them in their campaigns if they want to. Obviously GMs will have to come up with stats and levels for them using the ICE character law.