Alyagami

Alyami is the femslash ship between Alya Césaire and Kagami Tsurugi from the Miraculous Ladybug fandom.

Canon
Alya and Kagami don't know each other, but Alya has heard about Kagami from Marinette and when Kagami had her phone switched with Marinette's during the Friendship Day games, she saw Alya's video reply message to her friend. Since Marinette is friends with both girls, after Marinette truly got to know Kagami in "Ikari Gozen", there is a chance that they might have heard about each through her.

Fanon
While the exact origins of the ship is a mystery, as the two don't know each very well or at all, making it a rare femslash ship of the Miraculous Ladybug fandom, it might simply be due to fans who are hoping that the two would one day meet each other and become friends. Since they are both Ladybug and Cat Noir's allies through the use the Fox Miraculous and Dragon Miraculous, and there are fans who are hoping that Kagami would be given a chance to become Ryuko again; in which would have her and Rena Rouge working together as a team.

Fandom
TUMBLR

Trivia

 * According to Feri González, Kagami isn't limited to the role of alternate love interest.
 * The same with Luka.