Thanks for the input. Maybe I really am jumping the gun. I'm sure a lot of my questions will be covered in future books.
For years I've been searching for a neat, modular system that can handle a large variety of character types, yet not be too complex. HARP seems to fit the bill.
As I was reading, all the different classes/archetypes I've encountered over the years seemed to pop in my head. For example, barbarians (fighter with special training package/background?), psionicists, paladins, etc. As I mentioned, I bet a lot of these are covered in other books, or simply require tweaking the existing professions.
But there are probably some types that don't fit the existing professions. For example, there was a Kensai (sword saint) class in the original AD&D Oriental Adventures. This was a class that focused almost exclusively on one thing - being a master swordsman.
The fighter class doesn't really fit this, while a monk would be closer (with Chi skills), but the monk focuses on hand-to-hand fighting. Maybe the Kensai could be represented as a Monk with a certain training package and a new martial arts style.
Just some thoughts...
Aaron