ChiLumi

Chilumi is the het ship between Lumine and Tartaglia from the Genshin Impact fandom.

Canon
Lumine first meets Childe in 'Archon Quest Chapter 1 Act 1'. Lumine is escaping to avoid suspicion of being the culprit of Rex Lapis' murder. When she was at the stairs she stepped on shard of glass accidentally grabbing the guards attention. Unfortunately, she gets surrounded by the guards until she hears Childe's voice saying "Hey girlie-- Hold still," or in the JP dub Childe calls Lumine "ojou-chan". Childe then knocks all the guards unconscious and escapes with Lumine. After both Paimon and Lumine are exhausted from running, Childe formally introduces himself. Of course, that wasn't his real name but an alias of sorts. Paimon and Lumine figured that Childe is one of the Fatui. Childe claims he isn't here for trouble, but is here to help them. Childe trust Lumine for not killing Rex Lapis since he's been keeping eye on Lumine. Childe has gave Lumine a fake Sigil of Permission created by the Fatui, and the story continues.

Lumine enters The Golden house to check on Rex Lapis' Gnosis, there she sees Childe who also had his eyes on Rex Lapis' Gnosis. Childe then challenges Lumine to a battle. Lumine successfully defeats Childe three times throughout three stages, but Childe wasn't finished. With all the Sigil of Permissions that the Fatui have been reproducing Childe summons Osial, Overlord of the Vortex.

In Tartaglia's Story Quest which can be unlocked at Adventure Rank 40 with Story Key, is where Lumine and Paimon meet Teucer or Childe's Little brother, almost at the end of the Story Quest Lumine, Paimon and Teucer are at Northland Bank and, Paimon said that Teucer has been following them/Lumine and Paimon the whole time, Teucer then gave an answer saying that he knew Lumine and Paimon the whole time because of a letter that Childe sent home. Teucer also said, that if Childe could quit his job, then he would join Lumine on adventures and after Teucer then left, Childe then appeared and he explained to Lumine and Paimon that he didn't want his brother to see him all weak as his last memory of him. Chile invites Lumine and Paimon to Snezhnaya they agree after all they made a pinkie promise to Teucer.

Fanon
This became a ship by the fandom seeing their relationship between each other by then, fanarts, comic dubs and fanfictions has been created by it. It also resulted about lots of them which means it has became a popular het ship in the fandom.

With the ship Aether (Lumine's brother) is portrayed as very overprotective of his sister. Same goes with Childe.

One of ChilLumi's rival ships are ChilZhong also known Childe/Zhongli. There is a poly ship with Childe/Zhongli/Lumine

Fandom
FAN FICTION

Trivia

 * Childe is around the age of a young adult, approximately 18-21 years old. Childe's constellation is the Monoceros Caeli.
 * Lumine is biologically 15 (and at least 3000+ chronologically). Lumine's constellation is the Viatrix.