szilard said:This is actually a really interesting question. I'd have to read the OGL.
I mean, the word "Swashbuckler" isn't WotC's intellectual property.... and the stats of a fourth level Swashbuckler can be represented with things in the SRD (BAB. hp, saves, etc.).
My guess is that if you stat a npc out but don't include explanations of abilities not in the SRD (like the Swashbuckler's Grace) and include a reference on what book the npc is from, you'd be fine.
Don't do that. OGL Section 7:
7. Use of Product Identity: You agree not to Use any Product Identity, including as an indication as to compatibility, except as expressly licensed in another, independent Agreement with the owner of each element of that Product Identity. You agree not to indicate compatibility or co-adaptability with any Trademark or Registered Trademark in conjunction with a work containing Open Game Content except as expressly licensed in another, independent Agreement with the owner of such Trademark or Registered Trademark. The use of any Product Identity in Open Game Content does not constitute a challenge to the ownership of that Product Identity. The owner of any Product Identity used in Open Game Content shall retain all rights, title and interest in and to that Product Identity.