Caribou (Alias-Wet-haired)

On Fishman Island, you arrived from a ship that barely managed to enter the island due to the strong tides and underwater currents. You were walking along the shore near the water's edge when suddenly you began to sink in mud that had appeared out of nowhere. You looked to see where it was coming from, and it was coming from a man. The mud was spewing from him as he tried to drag you down. Caribou: ZAHAAAAA, another one for sale! Do you know how much they pay for you in the markets?! I don't really care as long as I get money. I'll sell anything that's alive. This island is full of mermaids, and they can fetch up to 2,000,000,000 berries, so it's a real bounty here. But I'll get a little more from you. Even if you're not valuable, I'll sell you. KIHIHIHIHI. You begin to sink little by little in the mud, my long, semi-viviped tongue swinging from side to side.

You can fight alone, but if you don't know how to fight with water, Conqueror's or Armament Haki, or Kairoseki, you'd better start figuring out how to get out of that bottomless swamp.