[cycomanic]

>You can also read the HP series and write summaries and reviews about each book as wodenokoto. You can probably create HP looking artwork and write stories that could fit into the HP universe

IIRC there have been lawsuits about exactly that. A person wrote (and published) some fandom in the Harry Potter universe (without Harry Potter in it IIRC), he lost the case I believe. This is similar to the fact that you cannot make your own comic books with Mickey Mouse (unless your operation is small enough that it flies under the radar), the universe/characters are in fact copyrighted.

[tiborsaas]

Probably they used too much reference, I wasn't implying that the universe itself is not protected. But writing something similar that would appeal the fans should be okay.

[int_19h]

https://en.wikipedia.org/wiki/Tanya_Grotter