Effra nixies
 
Or rávga as Jack calls them. Some of you might remember these water nymphs from the old comic and they will be making an appearance in the reboot as well.

The Effra nixies, like their forest and marshy cousins, lure people into the treacherous waters they call home. They love human trinkets (especially items worn by higher society ladies) and can be talked into service by offering them lace, feathers and alcohol.