Elilyn

Elilyn is the het ship between Eliwood and Lyn from the Fire Emblem Blazing Sword fandom.

Canon
Lyn and Eliwood are amiable in the story, with Eliwood eventually looking up to Lyn and admiring her drive and confidence. Lyn on the other hand shows to have a protective demeanor towards Eliwood who she sees as frailer, as seen in the CD drama. In their conversation, Lyn asks Eliwood to make her feel beautiful and teach her to act as a true noblewoman. Eliwood also comments about Lyn's beauty to Hector.

Lyn and Eliwood then declare their love in the Dragon Gate in the end of the game. Eliwood succeds his late father as the marquess of Pherae.

The marquess of Pherae and the princess of Caelin were wed after the conflict. All of Lycia was in an uproar, but none could sunder their bond of love. They have a son named Roy, who will become a great hero. It's state that Roy's mother eventually died, but the cause of Lyn's death is unkown.

Fanon
Eliwood and Lyn are often portrayed as a being part of love triagle that almost always involves Hector, Ninian, Florina or Fiora, in which Lyn and Eliwood end up chosing to marry each other in the end. They have the dynamic of friends turned into lovers, in a slow burn style of relationship. The fictions and discussions also speculate the post war life, focusing on the marriage between Eliwood and Lyn, they raising their son Roy, and what would be the cause of Lyn's death.

The ship is also supported by those who appreciated and interpreted as a ship tease the presence of Lyn and her then son Roy interacting in the Awakwning DLC, they being together in SmashBros and in the Heroes live action trailer. Most of those who like Lyn x Eliwood pick the route in which Roy decides to fight for the land of Sacae, the homeland of Lyn.

There is strong friction with Elnini and Elfiora shippers, largely due to the game system of multiple canon endings and arguments over which is 'most canon' or 'most deserving' of being canon. Lyn and Eliwood shippers defend that their relationship is more realistic and healthier than Eliwood with Ninian because it's based on a solid friendship, and also that Lyn is a stronger independent woman that doesn't need to be saved all the time and doesn't leave everything behind for a love interest, while also pointing that Eliwood's relationship with Fiora seems more random since Fiora  involvement in the main story of Blazing Blade is not mandatory. Elilyn also finds strong competition with those who ship Lyn with Hector, Florina or Kent, the first two very popular ships.