Gariff Lucsly

Lucsly was a human agent of the Federation Department of Temporal Investigations in the late 24th century. From 2366 to at least 2373, he was partnered with Agent Lucsly. (TNG short story: "Gods, Fate, and Fractals")

In 2373, Lucsly and Dulmer investigated a temporal incursion by a disgraced Klingon Imperial Intelligence agent, who attempted to assassinate James T. Kirk in the year 2268. The agents later determined that Captain Benjamin Sisko and the crew of the USS Defiant had acted appropriately in their efforts to prevent this alteration of the timeline. (DS9 episode: "Trials and Tribble-ations".)

Later that same year, Lucsly and Dulmer questioned Captain Jean-Luc Picard regarding the USS Enterprise's recent visit to 2063. (TNG novel: Section 31: Rogue) They followed this up with a post-temporal violation reconnaissance mission to 2063 via the Guardian of Forever, as well as one to 1996, following up on another temporal incursion by the USS Voyager. (VOY short story: "Almost... But Not Quite")

Not long afterwards, Lucsly and Dulmer were assigned to investigate the removal of the Maquis from history. They discovered a temporal alteration caused by a student of the Traveler, and were able to have him restore the original timeline. (TNG short story: "Gods, Fate, and Fractals")
 * The name is an anagram of "Scully," a nod to the series The X-Files''.