I like to think of classes as grouped into 2 categories: primary and secondary
Primary classes include the Natural, Fire, Ethereal and Magical monsters. The only thing that seperates them from the rest is that they follow the standard element system rules:
All the other classes fail to match these criteria in at least one way, making them in a way auxiliary to the primary ones
I say this because I would like to start using these terms in my theories moving forward, if the need arises
That said here's an oddity I found: Dipsters are only found on islands that belong to the primary classes, with the exceptions of Workshop, Gold, Amber and Nexus
What do yall think?