It took me some time to come around to the idea of descriptive abilities and away from a solid grid of characteristics and their iconic 3-18 spread. Pits and Perils' notion of a singular (or couple of) strong stat(s) is interesting and clean.
I think that what I liked right from the get-go was PnP's own description of "Wise Fighter" in the core rules. I know exactly who that is. It's image is visceral and I know how to play him or her.
So here's a little pointless mind-dump. There's no real mechanical differentiation to these but simply serve as an aid to playing the character. I would write them as (STAT) Adjective Class.
Consider the differences between these: (INT) Brainy Fighter, (CON) Resilient Thief, (CHA) Captivating Cleric, etc.
|11-12||Any 2 (choose)|