The new enemies are really very well received, not everything will be skeletons and more skeletons.
But at the moment their appearances do not have any sense, some mixed with others, without an established area of the map, inconsistency of designs, etc.

So my proposal is:

Ghost pirates: They appear only near cemeteries or graves.

Ocean Crawlers: They appear only on the shores and have no presence on Devil's Roar (what is the point of enemies of vibrant corals where there are no corals).