Robcina

Robcina  is the non-binary/family ship between Robin and Lucina from the Fire Emblem fandom.

Canon
Robin and Lucina first meet when she is disguised as Marth, and aids Robin and the Prince Chrom when they are being attacked by the risen. Eventually, Lucina reveals her true identity as a time traveler, the crown princess of Ylisse coming from an apocalyptic future, daughter of their best friend Chrom.

Lucina tells that her father Chrom was killed by his most trusted friend who was possessed by Grima. She is not sure who it was, but eventually the traitor is revealed to be Robin. If Robin is male he can marry Lucina by archiving a S support with her. If they fall in love, Lucina tries to kill Robin to avoid an apocalyptic future to repeat in this timeline, but she is unable to do so because she loves him. They then go to a journey to find the missing stones of the Fire Emblem crest, to make an Awakening ritual to avoid Robin to be possessed, in hopes that this timeline will have a happier fate.

During the journey they also encounter their future daughter Morgan, another time traveler and lands in Ylisse without memories.

If Robin is female she can also be Lucina's mother if she marry Chrom. Two years after her wedding with Chrom, Robin will give birth to Lucina. Robin learn that "Marth" is Lucina from the futur some instant after Chrom. Like when she is married to Robin, Lucina won't be able to kill her mother.

During their journey they find Morgan, Lucina's younger brother, who is amnesiac.

When they finally defeat Grima, Robin face a dilemma, either letting Chrom giving the final blow wich will only weake Grima who will return generations latter or killing Grima themself wich will kill the fell dragon for good but with the risk of killing themself in the process. If Robin didn't sacrifice themself and is Lucina's mother or husband she will rasure them by telling that they made the right choice. If Robin choose to sacrifice themself they will deseaper but the epilogue show them reuniting with Chrom.

Fanon
Robin and Lucina is arguably the most popular ship for male Robin and Lucina. The pairing follows the theme of star crossed lovers defying Fate together. Robcina is as if it was originally meant to be that way since Lucina has a lot of feelings towards male Robin in the story. Her ship with female Robin is not possible in canon and while it has some following, it's not as popular considering that female Robin can be Lucina's mother if paired with Chrom.

People have different opinions to this ship due to the fact that Lucina travels from the future and marries someone from the past. Despite that, Robcina is one of the most popular Fire Emblem ships and is loved among many fans that it receives a lot of attention compared to other Lucina ships. Robcina has received art from multiple people and are also loved for the fact that both get to team up for an amazing fight in the Super Smash Bros series. People also purchase the Robin Amiibo and Lucina Amiibo and they normally place them together in order to show their support for them. Overall, many people see Robcina as a ship that was meant to be and they find it lovely to see male Robin and Lucina having a good time together.

This ship has also a family variante where female Robin is Lucina's mother. This happen in the game if a female Robin marry Chrom. Many fanarts depict Robin with Lucina alongside Chrom and Morgan as a family. Some fanfictions and fanarts show Lucina having to fight her mother possessed by Grima.

Fandom
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Trivia

 * The cutscene in which Lucina tries to kill Robin gets special dialogue if they are married.
 * Female Robin is also a popular mother of Lucina. The dialogue also changes in the same scene if they are related.