Black Fire

Some see it as a spiritual symbol from sightings in witch mountains to the words of the tora. It's said to have existed before the beginning of time, and it also used as a term to refer to tobacco disease. It has a lot of broad meaning it's even used as Starfire's older sister's name in Teen Titans. But in general it's simply a persona or a way to describe something Cool, attractive, abstract and mysterious. Something you'd call a calm yet fisty person as a compliment. Also a literal term for dim/dark fire with no light shining through it.