Welt & Bronya

Welt & Bronya is the family ship between Welt Yang and Bronya Zaychik from the Honkai fandom.

Background
One year before the events of the game, Welt Yang, the Herrscher of Reason, dove into the Sea of Quanta and encountered Kevin Kaslana, who defeated him. Welt creates a labyrinth to prevent Kevin from leaving a Sea, and to test whoever enters if they're worthy of inheriting the Herrscher of Reason core. He leaves a shadow, Joachim, a young version of himself, to watch over the labyrinth.

Under the Deep
Bronya enters the Sea of Quanta to retrieve the Gem of Desire. Bronya meets Joachim, who transports her into different bubble universes as trials for whether she is worthy. Each bubble universe is a test of Bronya's will, but also a reflection to parts of Welt's past and struggles. In the first world, young Joachim is experimented on due to being the 1st Herrscher, so Bronya solves it by having him enroll in St. Freya. The second bubble universe is a representation of Joachim’s own internal conflict with his past and responsibilities. Bronya empathizes with this Joachim and tells him not to run away from his fears, and to be honest with his family. The third world is one where Welt Yang became evil, trying to destroy Schicksal because the Anti-Entropy founders were murdered by them. He says that he and Bronya are one in the same, driven by hatred. Bronya defies this version of Welt because a certain Valkyrie taught her to fight for hope. The Star of Eden of that world responds to her, allowing Bronya to defeat Welt.

With the third world solved, Bronya has solved the maze and is granted access to the Herrscher of Reason core. However, Veliona wants the core because of a deal she made with Kevin Kaslana. They fight, and Veliona casts Bronya back into the maze. Joachim helps Bronya back into the Sea. After losing Seele, Bronya obtains the Herrscher core and transforms into the Herrscher of Reason, determined to save Seele.

Plain of Vigrid
While searching for Seele, Welt communicates with Bronya through the Herrscher core, congratulating her for integrating with the core. Welt warns that the barrier between reality is disintegrated, and they must stop Kevin before he obtains the Gem of Desire. He advises Bronya that their best shot is to gather his scattered power from across different bubble universes.

Bronya eventually finds Kevin, who is with Seele. They fight Kevin, who is able to disable Bronya’s Herrscher powers. Welt reconstructs his body with his Herrscher of Reason powers to protect Bronya. But Kevin obtains the Gem of Desire and escapes the Sea of Quanta, causing the space to collapse around them. Bronya and Seele escape together while Einstein sends someone to help Welt escape.

A few days later, Welt offers Bronya to be his successor to the Herrscher of Reason core, because it is more powerful in her hands, and because she proved herself in the Sea of Quanta. Bronya is hesitant, so Welt gives her some time. He says that if she accepts, he will train her how to use the Herrscher core.

Hailing From Nagazora
Now that the Honkai is no longer a threat, Welt steps down from his position as Sovereign of Anti-Entropy to become a full-time animator. Bronya excitedly joins him and works by his side as an R&D engineer intern.

A Post-Honkai Odyssey
By the events of APHO 2, Bronya has developed her own game, Arahato α, which Welt helped her on.

Quote
"Hey, mister, are you taking your daughter to see the cool monsters?"

- A staff member to Welt, who is with Bronya (Chapter 23)

Fanon
Because of Welt being a mentor to Bronya, plus both being successors to the Herrscher of Reason core, Welt is commonly interpreted as a father figure to Bronya.

Fandom

 * FAN FICTION

Trivia

 * Both had their original Chinese VAs in HI3 changed in Star Rail. Bronya's VA changed from Hanser to Xie Yang, and Welt's changed from Dai Chaohang to Peng Bo.