Lopez (Ensign)

From Memory Alpha, the free Star Trek reference

Ensign Lopez was a Starfleet officer stationed onboard the USS Enterprise-D between 2368 and 2369.

He was serving at ops in early 2368 when the Enterprise-D was on its way to Melona IV. (TNG: "Silicon Avatar")

Like the rest of the crew, he was affected by the Ktarian game and eyed Wesley Crusher suspiciously when he saw him walking through a corridor without the device. (TNG: "The Game")

Lopez attended the memorial service for Geordi La Forge and Ro Laren, held in Ten Forward. (TNG: "The Next Phase")

He was on duty in main engineering when Geordi La Forge and Doctor Crusher examined the biofilter readings of Sev Maylor. (TNG: "Man of the People")

He was on duty in main engineering when the Enterprise-D took Montgomery Scott on board and Scotty visited the "heart of the ship". (TNG: "Relics")

He was on duty in main engineering when Solanogen-based lifeforms were conducting medical experiments on the crew of the USS Enterprise-D. (TNG: "Schisms")

He later switched to security and at some point was responsible for setting up the duty roster of the security department. When he presented it to security chief Worf, who was curious about the whereabouts of his father at this time, Worf bluntly refused to accept the roster, ordering Lopez to do it again with the assignments ordered after priority and to finish it until 0900 hours. (TNG: "Birthright, Part I")