something like Aequorea victoria, a jellyfish that is sort of clear like water and also bioluminescent, seems very ghosty to me. but other bioluminescent organisms like anglerfish can also be very scary. some of the bioluminescent organisms might fit under fire as well. among non-luminescent organisms, some plume moths look very ghosty to me, and screech owls sound very ghosty to me.
things like ocean dandelions have been found near hydrothermal vents and look a little fiery (orange and glow!). something like a bearded fire worm or some corals sort of look fiery (orange) under visible lighting and then become extra fiery when they fluoresce.