Probably J.K Rowling's biggest inspiration!
I've always believed that The BFG has been J.K Rowling's biggest inspiration for the Harry Potter books. The whole part with the orphan (who in the book and in the animated movie looks like Harry Potter) who is getting visited by a giant in the middle of the night and getting transported into another world where magical creatures exist; it's all from here. Rowling has said that Dahl has been a huge inspiration, but I haven't read anything about the BFG. It's clear, however, that Harry Potter stems from Dahl's book.
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