Kurocina

Dark Pitcina is the het ship between Dark Pit from the Kid Icarus fandom and Lucina from the Fire Emblem fandom.

Canon
Dark Pit and Lucina have met in the Super Smash Bros. series. In Ultimate, they are both designated as "Echo Fighters" and are the only veterans to do so.

Trivia

 * The name "Kurocina" comes from Kuro, the Japanese word for "black".