Lumarc

Lumarc is the slash ship between Luka Couffaine and Marc Anciel from the Miraculous Ladybug fandom.

Canon
Luka and Marc don't know each other very well, but when Scarlet Hawk Moth attacks Paris with an army of past, reakumatized villains, Marc is briefly seen standing, shyly behind Luka as they both stand among the crowd of fellow participates in the Parisian rebellion, so they could help Ladybug and Cat Noir take on the red colored army of supervillains while the two superheroes go to face Hawk Moth in "Mayura".

Since they both attended the boys-only party that Nino threw for Adrien in "Party Crasher", there is a chance that they might have talked or bumped into each other in passing. Because Luka's younger sister, Juleka, is in the same art club as Marc, there is a chance that they might have heard about each other from her.

Fanon
While the exact origins of the ship is a mystery, as the two don't know each very well or at all, but there is a possible chance that it might have began when fans decided to ship them through their similar traits, as both Luka and Marc have black painted nails, wear hoodies and have a bit of an emo-like style to them. Or when the second part of the season two finale, "Mayura", briefly shows Luka and Marc standing not too far away from each other among the other Parisian rebellion participates, before they went into battle. Because Luka has also been fanon shipped with Nathaniel, fans sometimes have Lumarc rival with Lukaniel.

On AO3, the ship has only 7 fanfics about it. The slash ship also has a reasonable size fanbase and support on both Tumblr and DeviantArt.

Fandom
FAN FICTION
 * Luka/Marc on FanFiction.Net
 * Luka/Marc on FanFiction.Net

TUMBLR