DainsLumi

DainsLumi is the het ship between Dainsleif and Lumine from the Genshin Impact fandom.

Canon
Should the player have chosen to play as the male protagonist, Aether, in the game, that would have (theoretically) made Dainsleif and Lumine former traveling partners. This theory can be supported by the fact that in the World Quest, Bough Keeper: Dainsleif, Dainsleif would tell us that he used to have a traveling partner, and refer to them as a "her".

Towards the end of the recent Archon Quest: We Will Be Reunited, it is revealed that Dainsleif and Lumine do indeed know each other. Lumine however, considers Dainsleif to be her enemy due to the fact that she is the current leader of the Abyss Order, Dainsleif's main opponent. Given from Dainsleif's expressions however, he appears to have felt betrayed and hurt by Lumine declaring him as her enemy. Being that, Lumine tells Aether to not team with Dainsleif, as already said. Dainsleif was Lumine's enemy as he wasn't able to prevent the destruction of Khaenri'ah.

Apart from the game's quests, we also get a possible glimpse into their relationship in the Teyvat Chapter Storyline Preview. In this video, Dainsleif acts as the narrator, going over each of the 7 nations. Towards the end of the video, he says several quotes which hint towards his relationship with Lumine. "Step forth, if you have understood the meaning of your journey. Defeat me, command me to step aside, show me that you are worthier than I to rescue her ." From this quote, we are given the impression that Dainsleif is on a mission to rescue someone, a female. That female could possibly be Lumine, and the reason she needs to be rescued has to do with her position in the Abyss Order, hence why Dainsleif is fighting them. After this quote, Dainsleif also says another one in the end of the video. "My memory has all but faded completely...But I will always remember how much she too, loved these flowers." This quote displays a romantic connotation. It gives us and idea about how Dainsleif once shared an important feeling with the person he is trying to save, and that this person holds an important place in his heart. This person could potentially be Lumine, and this is supported by the fact that the flowers Dainsleif mentioned, and the flower placed in Lumine's hair, both share a very similar design as shown in the video.

Fanon
This ship had started after the Bough Keeper: Dainsleif quest. This quest had given the players the idea that Dainsleif was a traveling companion of the Traveler's Sibling. And with the content of the Teyvat Chapter Storyline Preview, that had only strengthened the Romantic Implications.

A twitter artist named june had created a comic called "A memory from long ago" which follows this ship back to when the two were traveling together. The comic was later dubbed RedVelvetVA and Sylleblossom.

There are currently 70+ fanfics about Dainsleif and Lumine. This ship is often overshadowed by other ships, especially ChiLumi and DainKae.

Fandom
FAN FICTION