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.

In "Desperada" Alya and Kagami were given a chance to spend sometime together on the Couffaine houseboat, where both girls agree that Marinette and Luka make a great couple, should things not turn out so well for her and Adrien or if Adrien ends up choosing Kagami. The two later get captured by the titled villain until Ladybug, Cat Noir and their new friend Viperion saves Alya, Kagami and the others by defeating Desperada. At the end of the episode, as Alya, Kagami and Marinette watch everyone else play their music, Kagami tells Marinette to make her choice between Adrien and Luka a lot more quicker, but Alya reminds both girls that the boys also haven't made their choices yet either.

In the events of "Miracle Queen", both girls become two of the many mind control victims of the title villain and because their both off and on Miraculous users, their "queen" orders them to reveal themselves before her and Hawk Moth. Due to the fact that Marinette still has the Dragon Miraculous from when she earlier entrusted it to Kagami, she didn't get to fight beside Alya as Rena Rouge among the other mind control superheroes. Alya and Kagami were later freed from Miracle Queen's control when Ladybug and Cat Noir defeated her, and Kagami later spends the rest of the day with Alya and her friends beside Adrien.

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, like they had done in "Desperada". 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.

Since the season three episode, "Timetagger", reveals that during the time of their future adulthood, Ladybug and Cat Noir will face a different holder of the Butterfly Miraculous, in which might make it safe for Kagami to become Ryuko again without putting her family and loved ones in danger, as well as the fact that the future adult versions of the main duo have assembled a team of fellow Miraculous holders, that might have Alya and Kagami as two of its members.

Fandom
FAN FICTION
 * Alya/Kagami tag on FanFiction.Net

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Trivia

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