Sentihua

Sentihua is the femslash ship between Fu Hua and the Herrscher of Sentience from the Honkai Impact 3rd fandom.

Taixuan Dream
The Herrscher of Sentience was born in Fu Hua's soulless body, and gained Fu Hua's memories. Because of this, she believed herself to be Fu Hua and despised the decisions her "past self." She strived to become a better Fu Hua who wouldn't follow the orders of others. Senti destroyed half of Schicksal's base and broke into World Serpent. There, she fought with Kevin and obtained Fu Hua's consciousness as a Fenghuang Down feather, though Senti believed it to be a projection of her past self. Senti went to Mount Taixuan and absorbed more of Fu Hua's memories that were in the form of feather. Fu Hua and Senti had a long conversation, with Senti criticizing her past decisions. Fu Hua argued that they were completely separate entities, to which Senti vehemently disagreed.

Once Kiana and Bronya arrived to Mount Taixuan, Senti decided that they should judge who was the "real" Fu Hua. When Kiana, Bronya, and Fu Hua teamed up against her, she angrily started a duel with Kiana. In the aftermath, Senti admits to Fu Hua that she was in denial about being a Herrscher. Fu Hua assures her that she knows Senti isn't evil, and proposes that they share the body. Senti rejects, wanting nothing to do with Fu Hua anymore, and they part ways.

Remaining Flames
At the beginning of Chapter 23, Bronya mentions that Fu Hua is still looking for the Herrscher of Sentience, indicating that she's been searching for a while. During the AE Anniversary party in Chapter 24, Kiana notices that Fu Hua is a little "rigid." Fu Hua admits that it's because she's not used to the crowd, and that she's worried about the Herrscher of Sentience. She wished that Senti were at the party too, and that the friendly atmosphere could change her view on the world.

When Kiana was captured by the Herrscher of Dominion's puppets, Fu Hua reaches out to Senti through her consciousness, and tries to convince her to lend her power to save Kiana. Senti refuses to help, believing that they're just trying to let the puppets steal her Herrscher power and get rid of her. Fu Hua honestly shares that she and Kiana never hated her, just saw her as her own person who deserved to be the person she wants to be. Senti softened up after that, but Fu Hua was running out of time and reluctantly took the powers by force. This undid a lot of the good faith built between them from this moment, and Senti completely cut ties with Fu Hua's consciousness in the subsequent chapter.

ELF Academy
In the non-canon spinoff miniseries ELF Academy, the Herrscher of Sentience appears in Episode 7 trying to scam everyone. She crashes into Fu Hua's house trying to escape from the police and Fu Hua laments her destroyed garden. In Episode 9, its revealed that both are now living together, and Cheng Lixue calls them her "masters." The next episode shows Fu Hua and Senti together on Mt. Taixuan, seeing the ELF Academy concert. It's revealed in the credits that Senti dyed and tried to sell some of Fu Hua's phoenixes during the concert, and Fu Hua is angry at her doing so without permission.

Moments

 * During a Chinese exclusive event where one of the characters could send you a phone call, Fu Hua says that the Herrscher of Sentience a deserves to experience a good life, and hopes to find her.
 * The two have dialogues with each other in the Dorms:
 * In the default dialogue, Senti greets Fu Hua and asks for a tour. Fu Hua hesitantly tells her that she can show her around if Senti doesn't use her powers, though Senti doesn't make any promises.
 * When with the Azure Empyrea battlesuit, Fu Hua questions who Senti is. She tries getting a reaction out of her by proclaiming she's the future Fu Hua, though Fu Hua calmly states that she would never turn out this way. Senti, annoyed at her identity being questioned, leaves.
 * After Chapter 25, the dialogue changes to Fu Hua trying to apologize to Senti. Senti pettily doesn't acknowledge her, claiming she was asleep. Fu Hua bids her goodnight, causing a baffled Senti to demand her to continue apologizing.
 * For Fu Hua's 2021 birthday CG, Senti appeared as a nameless storyteller and told her version of Fu Hua's backstory as the Celestial. Her account was more blunt than the mystic legends of Phoenix.
 * When bidding the player goodbye, there are two dialogue options. If the player asks if Senti is always in this alternate space, she'll look at Fu Hua and sigh, saying that she's grown tired of the same sceneries. If the player asks Senti to leave with them, she'll say she doesn't belong in the real world. Senti then ends the dialogue by asking the player to say hello to Fu Hua for her, as "today is a special day."
 * For Fu Hua's 2022 birthday letter, Senti uses her illusions to add her own section, calling Fu Hua's letter boring. She then proclaims that she won't lose to Fu Hua in flying kites, and urges Captain to watch her "talent show."

Quotes
"Fu Hua? I also hope she lives in happiness."

- One of Herrscher of Sentience's lines on the bridge.

"It's that old timer's birthday. Eh, wouldn't hurt to wish her a happy birthday."

- Herrscher of Sentience on the bridge, during Fu Hua's birthday.

Fanon
Sentihua started out as a somewhat niche ship, being overshadowed by more popular ships like Fuki, though its fandom has significantly grown. It's currently the second most popular ship on AO3.

Many people have problems with Sentihua, due to seeing it as selfcest and/or seeing them as having a familial relationship. While the ship is not strictly selfcest, it could be considered such since Fu Hua and the Herrscher of Sentience have the same body and memories. Those who ship them platonically see Fu Hua as Senti's mother or older sister figure, which likely stems from Senti's childish personality compared to Fu Hua's more matter of fact personality. Those who ship Sentihua romantically like Senti's tsundere attitude towards Fu Hua, and how both share a unique bond with their shared memories.

Fandom
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Trivia

 * In game, Herrscher of Sentience is the best support for physical teams, while one of Fu Hua's battlesuits "Azure Empyrea" is the best universal support for elemental teams.