De Mexicaanse regisseur Guillermo del Toro (Blade, Hellboy, Pan's Labyrinth) heeft volop ervaring met het fantasy-genre en werd daarom al eens gevraagd om de regie van een Harry Potter op zich te nemen. Del Toro sloeg de aanbieding af, maar laat nu tegenover MTV weten dat hij met de donkerdere toon van de laatste Potter-films een eventueel aanbod wil overdenken.

"They came to me once, for the third one. I’ve read them all, and when I read the books before the movies were done, I always pictured Charles Dickens - they were very Dickens-ian. The situation of Harry Potter reminded me a lot of Pip from Great Expectations. I saw them as deeper, more creaky, more corroded; then [the stories] were textured very differently when the first two movies came out. They were so bright and happy and full of light, that I wasn’t interested. They seem to be getting eerie and darker. If they come back to me, I’ll think about it."