Guillermo del Toro should be involved
Since the series will most target a slightly older audience than the movies, I really wanted Warner Bros to get a hold of Guillermo del Toro. I feel like his magic was pretty much made for a more mature, dangerous and even more wonderous world of Harry Potter! I could totally see him apply his touch to all the various creatures and make them look more fantasy overall. And how scary book accurate would Voldemort look?!
A smidge of Lovecraft is never a bad thing, in my opinion. https://imgur.com/a/guillermo-del-toros-sketchbook-xyWcV
In future seasons or spinoffs, perhaps he could so something? It could just be me, as a massive fan of Guillermo and general Lovecraft themes, who would want Guillermo's style to merge with JK Rowling's world. But you have to realize that, if Guillermo had been in charge of Prisoner of Azkaban, he'd have made it in almost the exact same style as Alfonso Cuaron, but with more respect for the books (he was the one who told Cuaron to actually READ the book he was adapting). That's who he is, and that's why I think he would be perfect if they want the series to stand on its own in the future, while also being unquestionably "Harry Potter"
