Hayao Miyazaki writes his own films and frequently begins animating before the script is finished, which is close to unworkable in commercial animation and which he has done repeatedly, including on Spirited Away.
His scripts refuse the standard antagonist structure. Totoro has no villain, Princess Mononoke gives its apparent one a coherent environmental and economic argument, and Howl’s Moving Castle resolves through understanding instead of defeat.
He adapts loosely. Howl’s Moving Castle departs substantially from Diana Wynne Jones’s novel, and she reportedly approved of the changes.