I hope no quams arise about this class. Swashbucklers come in all flavors.
Who wouldn't want to aspire to become great characters like,
d'Artagnan.
Zorro.
The Scarlet Pimpernel.
Captain Jack Sparrow.
Robin Hood.
Don "Jaun" Giovanni
“In every stage of these Oppressions We have Petitioned for Redress in the most humble terms: Our repeated Petitions have been answered only by repeated injury. A Prince, whose character is thus marked by every act which may define a Tyrant, is unfit to be the ruler of a free people.” - Open Message to the Executive Branch.
A planar traveling fugitive from a Spelljammer of course. Maybe a Scro or a Fey'ri Tiefling from Sigil looking to meet a few elves What better model for a swashbuckler than a spelljamming son of a ....?