Matt Helm is an excellent secret agent character. The books are formula but
Warren Murphy and Richard Sapir
The Destroyer series is fun. Once they started writing them using a
"book mill" they deteriorated, but the early books in the series are
excellent. There must be more than 100 books by now.
Mack Bolan. The Executioner, turned into several spin-off series. The early
books were excellent, deteriorating when the went into the "book mill"
Mike Hammer, private eye, is a great, tough character. All of the books are