Who is the narrator, can she or he read minds, and, more importantly, can we trust her or him?
Third Person (Limited Omniscient)
For almost the entire book, the narrator follows Sophie. The BFG does not appear until Sophie sees him, and when the BFG hides while the Queen has her dream, the story shows Sophie waiting, not the BFG.
But the narrator seems to know about the BFG too, and will comment on his actions from time to time. Like when the BFG has to open the Queen’s window:
“The BFG was an expert on windows. He had opened thousands of them over the years to blow dreams into children’s bedrooms. Some windows got stuck. Some were wobbly. He was pleased to find that the Queen’s window pushed upward like silk.” (18.35)
The BFG isn’t telling Sophie that information. The narrator simply knows it about the BFG’s past. And in the final chapter, we find out why. Spoiler alert: The narrator is the BFG, after he’s learned a bit about language. Good twist, Roald Dahl.