Who is the narrator, can she or he read minds, and, more importantly, can we trust her or him?
First Person (Central)
Crispin uses "I" language to tell us his own story in his own words, which makes him a first-person narrator. He's also the main character, as the presence of his name in the title suggests, which makes him a central narrator. Take a gander at the following passage:
I kept asking myself if I felt different, if I was different. The answer was always yes. I was no longer nothing. I had become two people—Lord Furnival's son… and Crispin. (51.2)
This is a strong example of first person narration in which the person telling the story is also the person the story is about. Crispin's narration is so Crispin-centric that we're often inside his head, thinking about him in very specific ways. And in the end, we get to know him pretty well as he gets to know himself.