For a start, all of the Nero Wolfe novels by Rex Stout are narrated in first person by Wolfe's assistant, Archie Goodwin
It's great to see someone refer to Rex Stout and the Nero Wolfe books. I've read every one of them. I went through a period where I could not leave the house without a Nero Wolfe book in my hand. Incredible writer, and the most vivid characters.
Thanks, Joe, for a happy memory.