Entropy (deceased) was an Agent of ESAS from 2005-2008.
He was a human male in his late twenties and was originally partnered with Logan.
He had average, unremarkable facial features, close-cropped brown hair and brown eyes, and could usually be found wearing a long black cape. Unfortunately, because Entropy was also very short (5'5"), and the cape was somewhat longer, this led to him tripping over the hem from time to time, usually when turning quickly.
Entropy was an aspiring mad scientist (a chemist before his recruitment to the PPC, but his pyromaniac tendencies meant that finding civilian deployment was rather difficult.), combining a controlling, anal-retentive nature with bouts of deranged laughter. He was rather disdainful to others and regularly addressed those he talked to as fools.
He was recruited in 2002 HST into the DMS, although details of his first partner are unavailable. It is known that for some time prior to 2005 HST he had not had a permanent partner, going through a long line of temporary partners, until being partnered with Logan in February 2005. Logan's flaky nature turned out to be an adequate foil for Entropy's controlling tendencies, and the Marquis de Sod made the partnership permanent.
He was prone to being consumed by grand projects: a long-term research goal of his was an attempt to create a weaponised version of scumble from the Discworld continuum, which never came to fruition, but did result in a useful by-product in the form of Bleeprum, which was accidentally created when an exploding jug of scumble caused some powdered Bleeprin to fall into a pitcher of rum.
Entropy's compulsive nature was a constant source of annoyance to Logan, who is much more impulsive; however, the annoyance was mutual. Despite this, a degree of camaraderie did grow between Entropy and Logan.
He was next-to-useless with conventional weaponry, using a crossbow only as a last resort when all explosives failed, or else relying on Logan to do the actual Sue-killing.
Entropy had aspirations for world domination, a potentially dangerous trait in a PPC agent; however, his tendency to get side-tracked by projects, his less-than-charismatic personality, and his lack of physical strength or weapons prowess meant that the DIA had no serious cause to worry.
Agent Entropy was one of the victims of the macrovirii in the 2008 Macrovirus Epidemic, when the macrovirii broke through the door of RC 8.3145. Logan was not in the RC at the time, as he was sparring with Agent Kern in the ESAS Training Room. Although Entropy was first only declared missing, once the Epidemic and subsequent Invasion were completed, Entropy's body was discovered by Logan in RC 8.3145.