Mara/Light Hope is a minor/background pairing in the She-Ra fandom, but is generally one of the more popular ships for each character.
Canon
Word of God
On August 17, 2020, creator ND Stevenson confirmed in a tweet that Light Hope and Mara were in love in response to a fan question[1].
In a separate panel, Stevenson was asked about Mara and Light Hope in a post-canon context, and responded that they imagined that Mara and Light Hope existed together as holograms in the Crystal Castle, after Adora released the magic of the Heart and healed Etheria (the Twitch video has since been taken down and does not appear to have been saved, however the panel was linked to on Reddit here).
Mara and Light Hope reunited after the end of season 5 - This is sometimes influenced by ND Stevenson's comment that he imagines they live together "as holograms in the Crystal Castle" (Example, Example)
Fics dealing with Light Hope's programming - Light Hope succumbing to their superiors’ mind wipe, character studies of what her consciousness is like, her perspective on the thousand-year time lapse between Mara's death and bringing Adora to Etheria (Example)
Example Fanworks
FanFiction
"The Story of Mara, She-Ra of Etheria" by Tempest_Wind - Prequel series focusing on Mara, Light Hope, and Greyskull Squadron (currently in-progress with two completed parts and a third unfinished one)
Projection by Dire_Quail on AO3 - Early in her time as She-Ra, Mara finds Light Hope reviewing an old memory. Light Hope winds up telling Mara rather more than she thinks she lets on.