Lumither

Lumither is the family ship between Aether and Lumine from the Genshin Impact fandom.

Canon
Aether and Lumine were then separated by the Unknown God at the beginning of the game, Aether/Lumine then lost their brother/sister and then met Paimon.

In the Prologue of the game "The Outlander Who Caught the Wind", The Knights of Favionus ask what reward did Aether/Lumine wants after Aether/Lumine then Aether/Lumine wanted Missing Person Posters around Mondstadt to look for their brother/sister.

In Chapter I of the game "Farewell, Archaic Lord", Aether/Lumine also said the same thing and wanted Missing Person Posters around in Liyue Habor after they saved Liyue Habor.

In the Latern Lite Festival Event, in the quest of "Current Deep Beneath The Laterns", Aether/Lumine and Paimon wished after getting the Azurite and the Vermillionite that was requested by Wang'ya, Paimon then asked Aether/Lumine the wish they made and there were 2 options to pick in the game. "That's my sister's deepest desire." or "I really hope her wish will come true" if you picked Aether as the MC and for Lumine. "That's my brother's deepest desire." or "I really hope his wish will come true".

Fanon
Although this ship isn't very popular. It has been also disliked, there are no fan arts or comics/manga of their relationship being lovers but it shows their relationship as within siblings only in fan arts or comics/manga.

Fandom
FAN FICTION