I'm one of those that need to get their own spin on everything so I don't like clean one class builds. The buiild I hope I will be able to pull of would be:

My pirate hunter:
Human - ST-16 / DX -16 / CO-10 / IQ-12 / WS-14 / CH-8 (sailor)
Starting as Ranger, dual wielding, (urban, bounty hunter) until level 3 (hunter) then switching to Barbarian (Path of the Totem/Wolf) until level 5 and a final switch to Fighter to reach Battlemaster (if possible by level cap). If it goes beyond level 12-13 I would probably commit to one of the three classes and just stick to it.

It's far from optimized and more of a NPC character than hero of the story, but very versitile. Espeically if the Hunter could be replaced Gloom Stalker (50 feet turn one movement is fun laugh - and once your party catches up they benefit from the wolf totem advantage), while rage resistances help with the low hitpoints. It also gives a bit of out of combat skills. And if charging ahead is too crazy, just Hunter's Mark your target and use a bow (meancing attack would be a nice cap stone if it goes to level 12).