The unnamed religious fanatic is the secondary antagonist of Zero Time Dilemma, and is the person Delta claims to be trying to stop, assuming that Delta isn't lying about the fanatic's existence. They are a terrorist with aspirations that dwarf Free the Soul's; to wipe out all of humanity. However, the identity of the terrorist, as well as their method for wiping out all of humanity, is unknown.
The identity of the terrorist is a total mystery - not even their gender is known. It was specified that the fanatic was religious, but details on their faith or piety are unknown. It is also unknown if they even exist.
Zero Time Dilemma
Dialogue by Delta reveals that the true motive for his plan to kill 6 billion humans with Radical-6 (despite what Dio said in the previous game) is to prevent an even more deadly terrorist attack that would kill 8 billion people, perpetrated by this unknown terrorist. A terrorist attack by this religious fanatic will trigger a nuclear war killing all of humanity. He estimates that with 6 billion dead, he would have a 75% chance of killing the radical terrorist.
The ending of Zero Time Dilemma has Carlos deciding whether or not to execute Delta. It is possible that the radical terrorist lived to carry their plots if Delta was shot as the epilogue files may suggest that Carlos did not kill Delta (as Delta's death is not mentioned in them, although Delta's survival is not mentioned either).
- It is possible they were a SHIFTer who had something to do with the placement of the Snail.
- Delta stated in the previous game that he wanted to wipe out humanity to create a new world only for his Myrmidons, but this motive is completely different from his stated motive of stopping the terrorist.
- There is a theory that the religious fanatic is Dashiell Gordain, possibly (accidentally or regretfully) brought to the future with the transporter by Delta.