I imagine pirates making use of various weapons, and being a skilled and insightful class, even because pirates are in a way a group of mercenaries, who work on the high seas, it is normal for each mercenary to have their own way of fighting, as pirates are looters and greedy mercenaries, who live free each living in their own way without having much discipline. Keeping that in mind, I see the pirate class as very diverse, using all sorts of weapons and tricks, who knows, maybe even using a little magic, because if there's magic in the game's universe, why don't pirates use it?
skill suggestions
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Tank/dps (can only use anchor, or two-handed axes or hand cannon)
Ability: The character casts an anchor, knocking enemies down and stunning them for a short time.
Ability: The character pulls the enemy using the anchor.
Ability: Uses a hand cannon dealing area damage.
Ability: Fires multiple cannon shots.
Ability: Applies a strong gople to the enemy causing bleeding.
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Hybrid Pirate (uses pistol in one hand and saber in the other) or (uses both pistols and two swords)
Ability: The character dodges an attack.
Ability: The character throws a grenade dealing area damage.
Ability: The character shoots an enemy with his pistol
Ability: The character puts poison on his blades.
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Marksman (only uses musket, but does a lot of damage, but has low health)
Ability: The character shoots an enemy using a standard musket dealing heavy damage.
Ability: The character applies magic to his bullets causing various types of damage or effects.