Kiamei

"Because we understand each other, I know what her decisions would be, and it's the same way around, and none of this is going to be changed by how far we're apart or how different our positions are."

- Mei to the 10th Herrscher about her and Kiana

Kiamei is the femslash ship between Mei Raiden and Kiana Kaslana from the Honkai Impact 3rd fandom.

Canon
Mei and Kiana are both teenage students who are training to become Valkyries together at St. Freya High School. They're part of the main 3 characters in the game along with another younger girl named Bronya Zaychik. Kiana is very open towards her attraction to Mei and insists that she loves her back. A lot of the time she will blatantly flirt with Mei and carry on with perverted comments or actions to do with her, even in serious situations. Mei usually doesn't mind Kiana's actions as long as she's able to contain her public displays of affection.

They first met in the year of 2014 when a Honkai outbreak took place in Nagazora and turned many into zombies. As one of the survivors, Kiana made her way to her school's rooftop for safety where she met a senior student named Mei Raiden. She turned out to be a Herrscher, but her human conscience appealed to Kiana so they fought as she tried to save her. Once Mei gained control of herself again, she tried to jump off but Kiana grabbed her hand and pulled her back up with a smile, resulting in the Herrscher deciding to hide herself away in Mei's heart because she could tell her host cared about this girl. From there on the two became close friends as they tried to escape their school together. Later on, Mei thanks Kiana greatly for saving her life, which is also when Kiana calls her cute for the first time.

Fanon
Kiamei is the most popular ship in the fandom and the most well known outside the fandom. Some players even state that if miHoYo does not add Kiamei into the 4th game, they should at the very least let them reunite, or give a bittersweet ending and state that if the two would get a bad ending they would quit the game. Some people might dislike the ship because they see it as "overrated" or think that Kiana is annoying and clingy. Some may even go as far as describing some of Kiana's actions towards Mei as harassment. Though as the story continues and the characters keep growing, there's still many chances for more people to come and like it, especially as their characters develop more (i.g. Kiana maturing, and Mei being more aware of who she's really fighting for).

It is the most written about ship on AO3 with FuKi (Fu Hua x Kiana) and Bronseele (Bronya x Seele) coming in second and third. This is the most trending ship in the Honkai Community with FuKiMei (a fanon ship consisting of Fu Hua, Kiana, and Mei) and BronSeele as 2nd and 3rd.

Fandom
FAN FICTION

Quotes
"I believe in Mei-senpai. We're the best of partners, after all."

- Kiana in her bridge voicelines as the Herrscher of Flamescion

Trivia

 * They're both Herrschers; Mei is the Herrscher of Thunder and Kiana is the Herrscher of the Void and Flamescion.
 * Kiana loves food and Mei is an excellent cook.
 * In the game, there is a stigmata named "True Love Forever", which has art of Kiana in a tuxedo holding Mei who is in a bride outfit.
 * Kiana is often compared to a tuna as a joke by fans and developers of the game. Because of the joke, MiHoYo added in-game weapon which can be equipped on Mei named "One Salty Tuna".
 * Sirin calls Mei Kiana's girlfriend in Chapter 2-6, which was later removed because of the censorship laws.
 * In a manga which was later decanonized, there was a scene where Mei was worrying about Kiana and had a dream where they got happily married, only to result in Kiana dying before her eyes.
 * The trial character of White Comet (W.C.) for Chapter 17, (Thunders Over Nagazora) in the stage where Kiana and Mei fought before Lament of the Fallen (name of the animated short), W.C's stigmas are shown to have Mei stigmatas, namely; Mei: Princess (T), Mei: Bride (M), Mei: Birthday (B)
 * In Gun Girlz/Honkai Gakuen 2 (the predecessor to HI3rd), at the end of the main story God Kiana asks if God exists and that if God does exist, let her and Mei meet again before the world resets.
 * In the Xuanyuan Chronicles, Kiana mentions having a cat named Sora. Mei believed Sora to be another girl and Bronya comments on how she "detects jealousy" which lead to Kiana having to clarify that Sora was her cat.