Bio: An "Infinity Warp" created by Gamora when she came into possession of all six Infinity Stones. She essentially folded the universe in half, creating "warps" of existing people in the universe (where two people were merged together to create a single new person). As of this time, it's not entirely clear who the characters warped to create Hellfire were. It's possible that the combination is that of Daimon Hellstrom and Punisher.
Notes: It's unclear if a character can be warped more than a single time. The costume that Hellfire wears would suggest that Punisher is definitely a character that was used in the warp (and the name of Hellfire would suggest Daimon Hellstrom), however, it's known that The Punisher is being warped with Power Pack, so this casts doubt on who the characters warped to created Hellfire actually are.