Lucissa

Lucissa is the family ship between Lucina and Lissa from the Fire Emblem fandom.

Fire Emblem: Awakening
Lissa and Lucina are both are royals of the Ylissean Exalt bloodline, being aunt and niece respectively. Despite being related to each other, they share no supports. Lissa is the younger sister to Chrom, the current Exalt King of Ylisse and leader of a volunteer justice force called "The Shepherds", to which she also belongs to. Lucina is Chrom's daughter from a ruined future where the Fell Dragon Grima conquered the world, inspiring her to travel into the past to prevent Grima's forthcoming by any means necessary. Together they quest around the continent to defeat Grima's forces and bring peace to the world.

When traveling to the past, Lucina disguises herself as Marth, the Hero-King legend from a millennium ago. "Marth" ends up saving Lissa's life when she's being attacked, and Lissa ends up remarking that "Marth" is "dreamy". Once Lucina reveals her true identity, Lissa does not make another comment such as that again, but does not rescind her comment either. In Owain's Paralogue, Lissa asks Lucina if she has any children in the future. Lucina answers yes, but avoids Lissa's second question of his personality, knowing that Owain is quite eccentric.

Fire Emblem Warriors
Lissa and Lucina share a support together this time, where the two are panicking over a bug entering their tent. Lucina contemplates killing it with her legendary blade, but Lissa's concerns of using it on just a bug hold her over until the bug disappears. The support is, at best, simply a reference to Lucina's sibling supports in Awakening, where she and her sibling similarly panic over a bug. The support ends with them feeling like closer family after the whole ordeal, before another bug appears. Despite having a support, Lissa and Lucina do not share unique dialogue when paired up together in battle.

Fire Emblem Heroes
Lissa and Lucina do have alternate costumes throughout several different events, but they rarely coincide with each other. In the 2022 Valentine's event, "Here With Me", they both appear in white, Spring dresses with adorned with and carrying flowers. They both struggle with finding a proper gift for their shared relative Chrom.

Fanon
Lucissa as a pairing is a rare one. They aren't paired together often in artwork or even in canon, to where even if they appear together, they most likely won't even refer to each other, or have much to say. The Warriors support they share even remark on this, where they wonder if they could have other traits in common besides their shared hatred of bugs. They unfortunately never have the opportunity to find out, however. It is a common sentiment from fans to want more canon material for this pair, as well as the similarly situated family pairing of Chrom and Owain.

A romantic pairing of this ship may stem from the part where Lissa calls "Marth" dreamy. Lucina is never aware of this, since she made her time around the Shepherds short as she rescued them, adding on to the mysterious appeal that Lissa found herself captivated by. A common appeal of the ship is Lissa finding "Marth" attractive in the first place, then imagining how Lissa reacts to Lucina being both a woman and her niece. On Lucina's side, it would be how she gets wrapped up in Lissa's attitude, despite having the knowledge of being her niece that Lissa doesn't have. Such a line is never repeated after Lucina reveals herself as Chrom's future daughter, but the one-off line still managed to bring in a few writings and images of the family pairing.

Lissa, as a character, is kind and headstrong. Lucina herself describes Lissa's smile as being a beacon of hope, shining even in the darkness. She's also often mischievous, pulling pranks on those around her. Lucina is kind as well, in addition to being stoic and humble. In fan material, Lissa can be teasing Lucina, breaking through her stoicism. Otherwise, they'd be having fun as a family, such as in the 2022 Valentine's event in FEH.

Fandom
FAN-FICTION

Trivia

 * In Lucina's appearances in the Super Smash Brothers series, she has an alternate color that bares Lissa's color palette.
 * Despite being younger than Lissa, Lucina is next in line to rule Ylisse. This is due to the fact that Lissa does not bare the Brand of the Exalt, a mark of Ylissean royalty that causes Lissa personal grief to be missing. Lucina has the Brand in her left eye, which is partly why she employs a mask when she disguises herself as Marth.
 * To add on to this, despite Lucina being from the future and a baby in Lissa's own timeline, Lissa is speculated to be technically younger than her.
 * Lissa finds "Marth" attractive before knowing that he is actually her niece from the future. This falls under the trope of Surprise Incest, and is even listed as a Video Game example of the trope.