Captain Lopez was a notable Starfleet officer during the 24th century.
Lopez was one of many future captains advised by Boothby, Starfleet Academy's groundskeeper.
A member of Species 8472 emulating Valerie Archer noted to Chakotay that "half the captains in Starfleet wouldn't be where they are today if it weren't for Boothby," including Lopez. (VOY: "In the Flesh")
This character was only mentioned in dialogue.