Anonymous X

Anonymous X is a character in Deus Ex: Human Revolution. His real name is not revealed, it is only known that he works at the LIMB clinic in Hengsha, where he is met during the side quest Shanghai Justice.

Background
Anonymous X does not seem like the other LIMB doctors and desk attendants that Adam Jensen encounters during his travels and is only seen working at the clinics reception desk during his appointment in the quest.

He was able to find the real autopsy report of Evelyn Carmichael, which was done by LIMB, and was contacted by Faridah Malik, who did not believe the official story of Carmichael's death and asked Jensen to investigate several leads.

When he is met to hand over the information, he seems to exaggerate his role as an informant, demanding a long code phrase and trying to stay as secretive as possible. The code is "Death and life have their determined appointments."