Fuki

Fuki is the femslash ship between Kiana Kaslana and Fu Hua from the Honkai Impact 3rd fandom.

St. Freya High
Kiana and Fu Hua were both Valkyries training at St. Freya High School. Unbeknownst to Kiana, Fu Hua was sent by Overseer Otto to surveil Kiana and the Herrscher of the Void dormant inside her. The two first met when Fu Hua tried advising her to be less impatient when taking the exam. Kiana was initially annoyed and confused by her fancy speech, and was outraged to see that see failed her first exam while Fu Hua got top score. Throughout her time at St. Freya, Kiana mostly saw her as the dull, boring class monitor.

Moon Shadow
Fu Hua takes Kiana on a mission to Singapore per Overseer Otto's orders to obtain the Gem of Serenity, while assessing K-423's progress. They go to a hotel, where Kiana goes off enjoying the buffet while Fu Hua works on infiltrating one of the rooms. Fu Hua gets captured by a Welt Joyce clone, but manages to escape, while Kiana gets captured by Dr. Magi. Dr. Magi reveals that he is going to "save" as many Valkyries as he can by removing the Honkai energy in their body, therefore removing their power. Meanwhile, Fu Hua goes to the shapeshifting Valkyrie Wraith for intel. Wraith teases Fu Hua by shapeshifting into Kiana and questioning if she's in love with her. Fu Hua then encounters Kiana's father, Siegfried. After a brief fight, he shares Anti-Entropy's plan and gives her a box to store the Gem. When asked why he's helping her, Siegfried says that he saw her save Kiana and trusts her to make the right choice.

Kiana convinces Dr. Magi to let her remain a Valkyrie, and they find where the Gem of Serenity is being stored. Everyone realizes that Anti-Entropy is trying to create a Honkai eruption with the Gem, so Kiana insulates the gem with her palms, putting her at high risk to Honkai corruption. Fu Hua finds them, and carries Kiana away, agreeing with Dr. Magi that she's proud of Kiana. However, once she tries to take the Gem and insulate it in a box, Sirin, the Herrscher of the Void inside Kiana, awakens. She and Fu Hua don battlesuits and fight, though Fu Hua is able to put Sirin back into slumber.

Voice in the Dreams
Himeko instructs Kiana to get tutored by Fu Hua to improve her failing grades, much to Kiana's dismay. Fu Hua teaches Kiana about countering enemy types, and chastises Kiana's impulsiveness when it comes to battle. At the end of their training session, Fu Hua tells Kiana that she can reach out later if she has any more questions, and Kiana comments that Fu Hua is actually nice from time-to-time, and that it's impressive how she's already an A-rank Valkyrie.

Under the Falling Sky
Kiana was in a virtual reality database, where she decided to save her mother Cecilia from the Herrscher of the Void, even if she was only in a virtual world simulating the events from 17 years ago. Fu Hua confronts her once the fantasy breaks, coldly revealing that what Kiana experienced were just illusions from Sirin. Kiana, refusing to accept this, breaks down while holding onto Fu Hua's shoulders, and the Herrscher awakens in her body. The two fight, ending with Fu Hua capturing Kiana and bringing her to Otto. At this point, she viewed Kiana as a threat to humanity and helped Rita stop Theresa and Himeko's plan to free Kiana.

When the Herrscher of the Void was released and wreaking destruction, Fu Hua was determined to stop her. However, Otto revealed his plan of letting the Herrscher kill Theresa, which would bring Kiana back and give him a human with herrscher powers. Fu Hua realized how vile of a person he is, so to prevent her from stopping him, Otto shot her in the head. Fu Hua used the Zeroth Power of Fenghuang Down to transfer her sentience into feathers and bind them to her colleague's minds, including Kiana.

A Shooting Star Streaking Across the Night
Kiana spent her time in Arc City with Fu Hua's sentience in her mind suppressing Sirin and guiding her. However, for the first 3 months in Arc City, Kiana refused to acknowledge the voice in her head. After Sirin again tried preying on her negative emotions and take over, Fu Hua urged Kiana to stop fighting Honkai beasts and risking corruption. Kiana yells that at her, confronting her about Fu Hua spying and betraying her. Fu Hua apologizes, and regretfully says that if worst comes to worse, she's going to have to ensure that all three of them fall together.

After another struggle with Sirin, Kiana holds a gun to her head, refusing to let her take over. Before she can shoot though, Fu Hua brings the gun away and tells her that she's here. Fu Hua then tells Sirin that she won't give up fighting for humanity, especially since Himeko had placed so much faith in Kiana. The two face Sirin together, where Kiana gains control over her Void powers and becomes Void Drifter.

Later, Kiana dreams of Kevin talking to a girl named HUA on the moon before going into cryogenic sleep. Fu Hua explains that Kiana dreamed of her own memories since their minds are intertwined. Fu Hua then reveals that she's from the Previous Era 50,000 years ago. Kiana is shocked, and remarks that while she always knew Fu Hua was special, this revelation was unbelievable. Fu Hua goes on to explain who Kevin Kaslana and World Serpent are. She advises Kiana to leave Arc City, as World Serpent is carrying out Project Stigmata there, and if Kevin sees Kiana, he'll kill her. Kiana responds that she wants to stop running away from her problems, and Fu Hua relents. The two carry out a plan of sneaking into World Serpent's lab.

After a fight with World Serpent agent Raven, she reveals that World Serpent's plan was already in motion and that she was stalling Kiana. Kiana tries to think of a way to stop World Serpent's plan, and Fu Hua suggest to unleash her full Herrscher power. However, Fu Hua will have to suppress Sirin, and Kiana worries about her wellbeing. Fu Hua assures her that she's strong enough, and that Kiana was right earlier about how they shouldn't run away from their problems. Fu Hua sends her off and Kiana thanks her.

The Prodigal Girl Returns
Kiana escapes capture in a North African Schicksal base, where she encounters Kevin Kaslana. Kevin attacks her with Judgement of Shamash, but it is blocked by Fu Hua's Fenghuang Down. Fu Hua tells her to run as she delays Kevin. Kiana protests, but Fu Hua expresses that if Kiana dies, her promise of protecting the world dies with her. Kiana regretfully concedes, apologizing before running and not looking back.

Taixuan Dream
Without Fu Hua's sentience in her mind anymore, Kiana and Bronya go to Mount Taixuan, hoping to find any knowledge Fu Hua left behind and the Edge of Taixuan. They find a feather, and one of Fu Hua's disciples, Lin Zhaoyu. Zhaoyu advises them to find more feathers, which contain Fu Hua's memories, so that they may find what they're looking for. The first memory they witnessed was of young Hua before going to boarding school. Kiana comments that it's hard to imagine this young girl as the reliable class monitor she came to know. The two learn more about Fu Hua through her memories and sadly reflect on the many burdens she experienced alone.

After learning of how Fu Hua's past disciples killed her, Kiana and Bronya encounter a seemingly revived Fu Hua. They are immediately suspicious of this "Hua." "Hua" allows Fu Hua's Fenghuang Down feather to talk to them, which is the same sentience that accompanied Kiana in Arc CIty. Kiana is surprised and relieved to see her. During a brief fight with "Hua," Fu Hua telepathically informs Kiana and Bronya that this "Hua" is a Herrscher believing herself to be the real Fu Hua. As Bronya stalls the Herrscher, Kiana and Fu Hua formulate a plan of making the Herrscher doubt herself.

Later, Kiana explains to "Hua" that it doesn't matter if she's a better Fu Hua, they care about their friend for who is she is. The Herrscher is angered, realizing that they have teamed up against her from the beginning. Kiana resolves to get Fu Hua's body back. She battles the Herrscher of Sentience with occasional aid from Fu Hua's Fenghuang Down feather. When the Herrscher of Sentience is about unleash her Edge of Taixuan, Fu Hua tells Kiana to remember what she's taught her. The two conjure the Edge of Taixuan's Eminence to defeat the Herrscher. Fu Hua then decides to sacrifice herself to seal the Herrscher of Sentience, bidding Kiana one last farewell. Kiana refuses to accept this, and, fighting against the regrets Fu Hua has about her past, she breaks the seal. Fu Hua returns to her body and reunites with Kiana and Bronya.

Fanon
Fuki is one of the most popular ships in the fandom, though not as popular as the canon ship Kiamei. It's the second most written ship for both Fu Hua and Kiana on AO3, behind Kiamei and Sentihua.

While many fans passionately ship Fuki, there are a select few that are baffled as to how people can see any romance between them. They see the duo better working as platonic or as a mentor/mentee dynamic. Some people also tend to believe that Fu Hua is not the type to have a romantic relationship, due to her being immortal and never showing interest in a relationship. Many people generally see Fu Hua as Kiana's second girlfriend because of Fu Hua's arc happening just after the Kiamei "breakup" (Lament of the Fallen). There are some who prefer Fuki over Kiamei because they find their dynamic more interesting. However, many people ship all three of them together in the poly ship Fukimei.

Quotes
"Enough. Why is it always like this? Trading sacrifices for so-called victories. It's unacceptable. Give Fu Hua back to me!"

- Kiana, Shattered Samsara animated short.

"Kiana. I was someone sent by Otto to surveil you. But slowly, I began to understand that you are not the vessel he said you were. You are not anyone's pawn. You changed everyone. You changed me. You even... saved me. Perhaps I have made too many mistakes and taken too many wrong turns. But now, I believe in you, Kiana. Now, it's my turn to save you."

- Fu Hua, When Sparks Converge web event.

Fandom
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Variations

 * Fukimei refers to the ship between Raiden Mei, Kiana Kaslana and Fu Hua

Trivia

 * In the Chinese and Japanese dubs of the game, Kiana calls Fu Hua "Class Monitor." This is localized as "Fu Hua" or "Hua" in the English translation.
 * As the Herrscher of Flamescion, Kiana has a red streak in her hair similar to the white and red hair Fu Hua has in her Phoenix form.
 * Their Chinese ship name 符琪 (fúqí) has the same pronunciation as the word for "married couple", 夫妻 (fūqī).
 * Fu Hua saying, "This is my mission," in Shattered Samsara parallels Kiana saying the exact same thing to Mei in Lament of the Fallen.
 * In a now deleted tweet, HoYoLab's official twitter acknowledged the ship as "Fuki" when sharing fan art.