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Naturia had four evolution options now, it was the same as when it happened to Ignatius just some minutes ago. Will Furoh also have several evolution options?! Well, one thing I noticed is that this evolution is actually for their Class, or something. It seems their race just stays as a Spirit. Unless something very big happens, perhaps they'll keep the same race they have but their Class will change, which will reflect as a new appearance, new powers, and the like.
It makes me wonder if this is also related with the System, Classes don't exist in this world after all. It probably means that the System is capable of modifying the body and granting the skills and new power through Class Change similar to an Evolution by itself… Well, maybe Furoh will be different as he is not a spirit.