[Culhwch]

It is about Arthur, but it's more about Derfel, and Arthur's Britain, I think. Certainly Arthur is a major character, but Derfel is the heart of the story. Though generally I'm not drawn to it I like the first person in this instance; written in the third person this seies would have far less of an impact. It would be a totally different book. And actually I think the majority of his work isn't first-person, though I could be wrong. Certainly the archer series wasn't, nor the Starbuck books, and though I haven't read them I have a sneaking suspicion the extensive Sharpe series isn't either. You might just have hit upon the couple that are.