The Dread Pirate's page

If I went with that build I would tag on Martial Master to show his flexibility in combat.

That is a very interesting Archetype, it stacks with Grit, allows for the use of very clever actions.

I was thinking maybe a Mastermind Sleuth which stack.

Those classes do well with their cleverness.
And Definitely Inspired Blade is the archetype for the Swashbuckler.

Investigator may work but the Extracts are not something he seems to work with.

I want to make a character who is as close as possible to the Dread Pirate Roberts from the Princess Bride.

I know one side would likely be Swashbuckler, due to his speed and skill tricks with a blade I could say he is an expert duelist.

But the other side alludes me, I know this would do best with a Cha based class but I am not sure what.