I get a little practical when I think about the legal risks of posting a Hermione fan piece online, because the terrain mixes copyright, platform rules, and public backlash. Copyright owners of 'Harry Potter' control characters and story elements, so fanart is technically an unauthorized derivative work. If you post, a rights holder can send a DMCA takedown notice to platforms like Instagram, DeviantArt, or Etsy; those platforms usually comply to avoid liability, which can result in removed posts or suspended accounts.
Selling art raises the stakes. Commercialising Hermione-themed prints, commissions, or merchandise increases visibility and the chance of receiving a cease-and-desist or even a demand for statutory damages if the owner chooses to pursue litigation. Trademarks matter too — certain house crests, fonts, or brand icons may be separately protected. Another practical pitfall is depicting the actor’s likeness: making art that’s clearly
Emma Watson’s face risks right-of-publicity claims in certain jurisdictions. And NFTs have been a legal minefield; the copyright owners have pushed back on unauthorised tokenization of their characters.
So I usually do three things: design with clear originality so the work could be argued as transformative, avoid sales or use limited-run, licensed marketplaces if I’m unsure, and keep records of my process (sketches, concept notes) in case I want to claim transformative intent. It’s not foolproof, but it helps me sleep at night while still sharing art from the universe I love.