In the book Angel by James Patterson, the character reflects on their ongoing rivalry with a specific individual, who remains on their official "archenemy" list. This list is maintained formally, highlighting how serious and organized their conflicts are, even if it might seem a little bit humorous or unnecessary.

As the character notes, "Who, last time I'd checked, was still on our official archenemy list. {Yes, we have to keep a list. It's kind of sad.}" this quote reinforces the idea that their enemies are cataloged with importance, showing a blend of seriousness and perhaps a touch of self-awareness about the somewhat obsessive nature of their rivalry.