Name: The Death Vessel.
Flag: Blank black, with a strange symbol that can only be seen using observation haki.
Ship: The Death Vessel. (A large ghostly frigate with unknown origins. It's crewed by the damned, armed with powerful cannons that never run out of ammo, and its loaded with grand treasure, beautiful wenches, and fine food & drink.)
Captain: The Death God. (A beheaded wooden statue possessed by an evil spirit, containing a cursed jewel that can partially resurrect the dead, that's held in place with chains and shackles. Its origins are unknown, and it has an unquenchable thirst for treasure, wenches, and the finest food & drink in the world.)
Crew: Zombie & skeleton pirates, sexy slave girls, and the sea ghost army.
Notable crew-members: The giant zombie sea serpent that follows them.
File: The statue on board resurrected the bodies of diseased pirates, implanted pieces of his soul into them, and now uses them to pursue its dreams of grand treasure, beautiful wenches, and the finest food & drinks. The zombie & skeleton pirates were once the greatest pirates who ever died in that part of the world, (nearly all of them captains,) but now serve as bodies for the Death God, enabling it to indulge in greed, debauchery, gluttony, drunkenness, and cruelty, despite being trapped in an immobile statue. And all of them retained all the skills, physical capabilities, and knowledge they had in life, (excluding devil fruit powers and unique weapons that were lost,) and the Death God can exploit all of it at will. The women on board were all kidnapped, enslaved, and forced to work hard cleaning, repairing, and maintaining the ship, while also sexually serving the crew. In the process most girls were mentally destroyed, and became completely loyal to their undead masters. The best of the loyal girls were promoted from slave to slut, given better living conditions, and were allowed to take advantage of the slave girls. There's also an army of ghosts trapped in the waters surrounding the ship, that's always trying to grab anyone they can and drag them under. They can't fully exit the water, so they may use ghost chains to get at anyone staying out of reach. Many believe that the whole thing is nothing but an elaborate hoax, but those who've encountered them and survived claim otherwise.
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Name: The Deadstorm Pirates.
Flag: Skull face on a cloud.
Ship: About 6 ships in sub-par conditions.
Captain: Captain Deadstorm. (An intimidating man who wields a dark and mysterious power, and is not known for mercy.)
Crew: Army of well-armed skeletons and corpses.
Notable crew-members: Death row inmates who escaped and signed on as Deadstorm's subordinates, and girls who were taken as prizes and later became loyal.
File: Their captain's powers let him resurrect and command the dead, and he used it to create an entire army of the dead, that included not only dead humans, but also animals, giant bugs, and a few giant monsters. The source of his power is unknown, but the fact that some of his undead monsters reportedly attacked from the ocean strongly implies that the power is not devil fruit related.
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Name: The Cursed Corsairs.
Flag: A cross with RIP written on it.
Ship: The Dead River. (A fusion of island and ship, covered in dead trees and rusted cannons. It was originally designed to be a paradise at sea, with gardens, a freshwater spring, and fruit trees all over it, to ensure the crew would never go hungry no matter how long they were lost at sea for. But they completely failed to realize that it had no protection from sea water, and their cannons were vulnerable to rusting. A few big waves destroyed all of it, but that wasn't enough to stop them.)
Captain: The Undead Pirate Lord. (A little guy in a giant puppet suit that disguises him as a huge zombie pirate, with cannons on his shoulders, guns hidden in his body, and flamethrowers hidden in his arms.)
Crew: A random mix of people covered in black ink and glowing symbols, done to portray being under some kind of curse.
Notable crew-members: Skeleton and monster puppets.
File: When everything on the ship decayed, things fell into disarray. To compensate for this, the captain changed their themes to become fear based, taking advantage of the ship's creepy appearance to scare their targets. They were a little awkward at first, but they quickly got better at being scary and intimidating. It's just a Scooby-Doo act, albeit one backed up by guns and cannons, but they rarely encounter anyone who isn't fooled.
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AN: Happy Halloween!