Beiguang

Beiguang is the femslash ship between Beidou and Ningguang from the Genshin Impact fandom.

Canon
In Beidou's Voicelines, there are 2 voicelines each about Ningguang, for the first one is about Ningguang being the Liyue Qixing.

"Ningguang, eh? As far as Liyue Qixing is concerned, she seems to be doing a good job. But for me, my responsibility lies with my ship and my men, and not with the Liyue Qixing.", We assume her responsibility doesn't lies with the Liyue Qixing and she thinks the Liyue Qixing is doing a good job.

For the second voiceline it is about Ningguang's attitudes.

"Ningguang is never really one to speak frankly, but she has been very direct with her criticism of me in the past. Haha... But hey, whether she likes me or hates me is her choice, nothing I can do to sway her.".

In Beidou's Story in Story 3, It is stated that Ningguang has collaborated with the Crux, In the third sentence it is stated that Beidou does all the dirty work for Ningguang because Ningguang picked her to do all the dirty work, the sixth sentence, "Beidou is certainly unique among Ningguang's collaborators.".

In Beidou's Story in "Pier Laborers' Gossip" It also stated that Beidou has won to Ningguang twice.

Next up is Ningguang's Voicelines, there are a couple that includes Beidou in her Voicelines.

The first one is about Beidou's fines.

"That... captain. She clearly receives the adoration of many, but will always be the first to disregard the rules. The fines she has paid would be enough to buy her a whole new ship...", We assume that Beidou and her fines can buy a whole new ship which can mean that Beidou is neither rich or not.

The second one is about Beidou's Attitude.

"Perhaps you've never heard me speak like this. All that can be said has been said — both the good and the bad — but she still does as she pleases. Forget it. Keep Beidou out of my sight.", We can assume that Beidou perhaps sometimes broke the rules or annoyed her? Although it can still be something different to that.

The third is when Ningguang talks about when the wind is blowing she then says. "Gales like this can be the demise of fishermen, not to mention... Heh, nevermind.", We can assume that she is possibly talking about Beidou.

The last voiceline that includes Beidou is about Yaoyao, in the sentence of "I am content to extend some leniency to the odd bit of mischievous maneuvering by that boat captain.".

For Ningguang's Story, in Story 4 it is stated that in the last part "Ningguang agree to disagree and gave up trying to convince the stubborn Beidou to change.", We can might as well assume that Ningguang tried to change the stubborn or action Beidou does, it is also stated in the second last sentence at the end says "Beidou had no time for Ningguang's advice.".

Fanon
This ship quickly became a fairly prominent femslash ship in fandom due to the rival but rather friendly dynamics of the relationship between the two women. The fact that they both deeply respect each other and intersect regularly in the plot has also added fuel to the ship.