Feu follet or Fifollet
The Feu follet or Fifollet of Louisiana derives from the French, similar to the Will-o'-the-wisp.The legend says that the fi follet is a soul sent back from the dead to do God's penance, but instead attacks people for vengeance.
While it mostly takes part in harmless mischievous acts, the fi follet sometimes sucked the blood of children.
Some legends say that it was the soul of a child who died before baptism.