The Ultimate Fire Demon is a one-time character who appears in "Forces of Nature". This demon was created when Thunder and Lightning were tricked by an old sage into creating a fire large enough so that the sage could manifest it's power to become a large pyrokinetic demon.
- "Forces of Nature" (First appearance; Death)
- This demon appears to be a gigantic version of one of Trigon's fire demon servants.
- Although the power of the Titans could not stop it, interestingly, a rather simple part of normal nature (rain) could.
- The Ultimate Fire Demon is the first character to die in the series.