Unfortunately, Kallen -despite her abilities- could not defeat her former lover and was killed by the Houkai-possessed Sakura as a result.
Otto and Kallen
Otto's social rhetoric is mostly disguised, but his feelings for the childhood sweetheart, Kallen Kaslana, are genuine.
She has romantic feelings for Yae Sakura after she found her unconscious in a river.
Otto set free one of the Honkai Beasts kept within Schicksal's basement as a diversion for Kallen to escape, but it didn't go as planned. The beast went for a child, and Kallen was killed defending her. Otto could only watch as his plan to save his best friend killed her instead.
Trivia. Sakura and Kallen are married according to a 4koma posted by the official JP Twitter.
Kallen is glad to hear it. Six months later, Kallen discovers that she is pregnant. She immediately receives a phone call from Kaguya who has been watching her and Kallen confirms her pregnancy to her.
Before leaving, Seele gifted Bronya with the robot Project Bunny 19c, who became Bronya's main weapon, and kissed her. "I gave you my first kiss, Bronya!
Increasingly fascinated with the leading-edge technology within the Japanese manufacturers, Otto immediately fell in love with the Subaru.
After sealing Yae sakura in box, the Fatal Intelligence Unit soon caught up to Kallen and apprehended her and brought her back to the European Council, she was sentenced to death for her betrayal.
Houkai (or Honkai), also known as Collapse, are the titular central antagonists of Guns Girl Z and its sequel Honkai Impact 3rd.
Sakura had never had anyone who defended her, so she fell in love with Kallen. The sighting of Honkai beasts caused the village to propose another sacrifice.
Cecilia Schariac was the wife of Siegfried Kaslana and the biological mother of Kiana Kaslana. She was the most powerful valkyrja ever known by Schicksal with an S-Rank but she was not the first to hold that title.
As a result of staying in the quantum plane longer than intended, Bronya lost the ability to feel a wide range of emotions, required advanced legs prosthesis in order to move and had a biochip inserted in her brain to maintain survival.
As a clone made from Kallen's genes, Theresa takes after her. She has white hair often tied in a low side ponytail and bright blue eyes. Due to the cloning experiment, she is not able to physically grow and she is stuck looking like a 12 year old girl.
Theresa Apocalypse is a clone made by Otto using the genes of a Honkai beast and Kallen's DNA in an attempt to revive her but ended up with a different personality and never grows up beyond 12 years old.
Otot tries his best to save her, even a deal with his evil sister Risa, a power hungry woman who stops at nothing to get things her own way, even esperimenting on her own people. Sadly Otto's good intentions backfire, and Kallen dies.
Kiana Kaslana usually refers to: Kiana Kaslana (K-423): The main protagonist that players are playing in Honkai Impact 3, also the clone that have Kiana gene and Sirin's core.
Originally, as detailed in the St. Freya High manga, she was born in 1453 and would have subsequently died in 1477, making her age 24.
Magic State Unbridled: Kallen is immune to any form of elemental DMG and unleashes powerful skills at low HP. Judah Unleashed: After using her weapon skill, Kallen will unleash Judah to deal devastating attacks.
Subaru even agreed to take Rem as her second wife, but only if Emilia would allow it. In the fourth arc, he admitted to Emilia that both her and Rem are very precious to him, though Emilia still remains first for him.
Natsuki Subaru
Both personalities love Subaru, though the Witch of Envy personality is much more aggressive about it, while Satella is much more reasonable and cares deeply about his well-being. As already mentioned, The Witch of Envy stands behind Subaru's Return by Death.
Unfortunately, as of right now you can't be gay in Honkai Star Rail. Despite being an RPG with a large cast of characters, the game does not have any romance options at this time.
She is in love with Bronya Zaychik, She also gave Bronya her first kiss. Seele's heart is full of gratitude and love for Bronya. She clung to Bronya in the anime.
Manga Story
When Bronya shows off to Seele, Sin gets very annoyed; so when they're alone later, Sin pushes Bronya down some stairs and breaks her legs by stomping on them, saying that she won't let Bronya like Seele.