Son of the Hydra, Sea Dog, Captain Slork? (I'm keeping this to just the bare ideas as I entrust all numbers and specific buff/debuffs and lore to actual developers)

A jolly sailor, perhaps fish men are normal in the post-Maelstrom world, perhaps he was once a regular sailor turned into a fish man by the Adversary or some other entity to do its bidding, perhaps he's a proud son of a certain New England fishing town looking to earn it a place on the map.
General role concept: A CC oriented ambusher. Somewhere between Mo & Krill, Haze, and The Drifter in the sense that they love catching isolated players.
Weapon: A harpoon gun (either a rifle design or a large detached whaling type) with a slow projectile and rate of fire but high damage. Alternatively just a low ROF SMG in the style of something like the M3 'Grease Gun'.
1 Skewer: Launch a specialized harpoon that tethers the target to you. Spirit damage? Gun damage? This could have some additional effect like giving you bonus damage against Skewered targets.
Upgrade 1: Cooldown reduction.
Upgrade 2: Shortens the tether (or increase the range of the ability itself).
Upgrade 3: Increase the ability's base damage and/or increase the effectiveness or any passives it applies (or add the passive here)

2 Privateer's Cunning: Turn invisible for a brief time, then receive a fire rate and damage bonus upon exiting.
Upgrade 1: Decrease the range at which other players can spot the user while the effect is active.
Upgrade 2: Small move speed or duration boost.
Upgrade 3: Targets nearby when Privateer's Cunning ends take additional damage.
3 Anchors Aweigh: Hurl an arcing medium sized projectile that does modest (spirit) damage alongside a brief stun/slow on impact or in a small AOE on landing. Perhaps there could be additional/different effects for direct hits?
Upgrade 1: Increase the ability's damage.
Upgrade 2: Increase the strength and/or duration of the CC effects.
Upgrade 3: Cooldown reduction.

4: Mother's Blessing: A close range bite attack that counts as a melee strike. Deals high base damage and applies a non-lethal spirit Bleed DOT to any who survive.
Upgrade 1: Increases the attack's damage against Tethered targets
Upgrade 2: Increases the scaling or base % of the Bleed DOT.
Upgrade 3: If a target dies outright, refunds the cooldown of Privateer's Cunning (possibly other abilities as well)

A jolly sailor, perhaps fish men are normal in the post-Maelstrom world, perhaps he was once a regular sailor turned into a fish man by the Adversary or some other entity to do its bidding, perhaps he's a proud son of a certain New England fishing town looking to earn it a place on the map.
General role concept: A CC oriented ambusher. Somewhere between Mo & Krill, Haze, and The Drifter in the sense that they love catching isolated players.
Weapon: A harpoon gun (either a rifle design or a large detached whaling type) with a slow projectile and rate of fire but high damage. Alternatively just a low ROF SMG in the style of something like the M3 'Grease Gun'.
1 Skewer: Launch a specialized harpoon that tethers the target to you. Spirit damage? Gun damage? This could have some additional effect like giving you bonus damage against Skewered targets.
Upgrade 1: Cooldown reduction.
Upgrade 2: Shortens the tether (or increase the range of the ability itself).
Upgrade 3: Increase the ability's base damage and/or increase the effectiveness or any passives it applies (or add the passive here)

2 Privateer's Cunning: Turn invisible for a brief time, then receive a fire rate and damage bonus upon exiting.
Upgrade 1: Decrease the range at which other players can spot the user while the effect is active.
Upgrade 2: Small move speed or duration boost.
Upgrade 3: Targets nearby when Privateer's Cunning ends take additional damage.
3 Anchors Aweigh: Hurl an arcing medium sized projectile that does modest (spirit) damage alongside a brief stun/slow on impact or in a small AOE on landing. Perhaps there could be additional/different effects for direct hits?
Upgrade 1: Increase the ability's damage.
Upgrade 2: Increase the strength and/or duration of the CC effects.
Upgrade 3: Cooldown reduction.

4: Mother's Blessing: A close range bite attack that counts as a melee strike. Deals high base damage and applies a non-lethal spirit Bleed DOT to any who survive.
Upgrade 1: Increases the attack's damage against Tethered targets
Upgrade 2: Increases the scaling or base % of the Bleed DOT.
Upgrade 3: If a target dies outright, refunds the cooldown of Privateer's Cunning (possibly other abilities as well)