This guy has several YouTube videos on how WikiDot works:

I would still advocate having some sort of template for what info to put on a page. It makes things much easier to grade against a standard. You could however develop that template in consultation with the students (What kind of things do we need to know about each character?). Here's a link to the format I gave my students:

Unless otherwise stated, the content of this page is licensed under Creative Commons Attribution-ShareAlike 3.0 License