Well, books. Take the "New Frontier" series for example. In some cases, the book series has become so popular that other things have crossed into that series. I'm not quite sure what other things are but other things nonetheless.
I've always considered the Mithra to be the Luna's big sister. As for the Ancheron, I've never heard of it. Has anyone else heard of it? Is it something Aeries is working on and I haven't realised? Damn, need to be in the flow more...