Trivia. Sakura and Kallen are married according to a 4koma posted by the official JP Twitter.
She professed her love to Yae, and that she was innocent. Regardless, she was sentenced to death for her betrayal.
She eventually became Otto Apocalypse's obsession, thus causing him to genetically-engineer a clone named Theresa Apocalypse who has the DNA of Kallen and a Honkai beast named "Vishnu". She has romantic feelings for Yae Sakura after she found her unconscious in a river.
In the Second Key manga, they actually got married and had a kid. Their dead but Kallen from the Second Key acts the same way as the Kallen from Elan Palatinus. Though it is brief and it's a dream.
Kallen was Otto's childhood friend and only love, and in her, Otto found that maybe with his scientific leanings, he could be of use to humanity, leading to him joining Schikshal as a scientist.
She seems to accept this, and still supports Zero, even though she prefers to see Lelouch and Zero as separate entities; however, she later starts seeing them as the same person. Over time Kallen grows to love Lelouch, offering to die for him.
(2) Kallen x Yae Sakura - they're CANON. Sakura found Kallen when she was injured and nursed her back to health, they formed an "an intimate relationship," Kallen professed she loved Sakura, they're very much wives.
Otto is shown to be obsessed with Kallen. He only tried to find the cure for the Black Plague because he thought she would been disappointed in him if he didn't. Ironically, this also shows how brilliant he is.
Touched by Lelouch's gift, Kallen pulls him into a passionate kiss, which he reciprocates. As they drive home, Kallen wonders if it's time to give Naoto and Shirley a little sister. Kallen then asks Lelouch if she will marry him, but he cheekily declines. A few months later, Kallen is pregnant once again.
Theresa Apocalypse is a clone (dubbed as A-310) made by Otto Apocalypse using the genes of a Honkai beast named "Vishnu" and Kallen Kaslana's DNA in an attempt to revive her. As a test, A-310 has excellent Honkai resistance and strong powers. She was born on March 28, 1972.
Otto and Kallen
Otto's social rhetoric is mostly disguised, but his feelings for the childhood sweetheart, Kallen Kaslana, are genuine.
Cecilia Schariac was the wife of Siegfried Kaslana and the biological mother of Kiana Kaslana.
Kiana and Mei are canonically in love, and their relationship is central to the main story.
Yae Sakura and Kallen Kaslana, supporting each other, ended up falling in love with each other. However, even then, Yae Sakura could not forgive the villagers for killing her sister.
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 trio in the game along with another younger girl named Bronya Zaychik. Kiana is very open about her attraction towards Mei and insists that she loves her back.
SAKURA is a secondary character of Chapter 12 of the game. She is RIN's older sister and is a member of The Thirteen Flame-Chasers. She is ranked eighth and her codename is "Setsuna".
With this, Lelouch asks Kallen to "console" him, then proceeds to stand up and lean in to kiss a surprised Kallen. Although she nearly reciprocates it, she stops at the last second and slaps him across the face.
This might have been excusable in R1 when Kallen did not know his identity. But this continued in R2 when Kallen knew who he was. Despite Kallen even falling in love with the real Lelouch it was not going to get him to love her back.
Kallen even attempts to defend Lelouch when the Black Knights betray him. Lelouch pushes her away in a deliberate attempt to keep her safe. She later accepts the necessity of taking him down for the good of the world, but even then — and even after he is killed — she doesn't truly stop loving him.
Sakura was sleeping and awoke after 500 years.
Otto was slightly disappointed that the Second Herrscher had died as she was vital to reviving Otto's childhood love, Kallen Kaslana, and decided to create a replica of Kiana with the Second Herrscher's DNA, core, and all the other sorts, all to revive the Second Herrscher to aide Otto.
Otto is an antagonist, not a villain. He's morally grey, not evil. A villain does harm with the purpose of doing harm. An antagonist doesn't need to be bad, on the contrary they can be very relatable, but they are such because they oppose the protagonist.
His relationship with SAKURA is likely his closest after the one he had with Emile. He enthusiastically asks SAKURA to team up with him on occasion, and even defended her when he assumed Mei had called her a traitor, claiming they had no right to even say her name.
Are Bronya and Seele dating Honkai? One of three major main characters and recurring in the Honkai series. Bronya becomes the third Herrscher of Reason and the Herrscher of Truth. She is in a relationship with Seele.
Kallen is the ancient ancestor of Kiana Kaslana and the most famous Valkyrie to have ever lived. She eventually became Otto Apocalypse's obsession, thus causing him to genetically-engineer a clone named Theresa Apocalypse who has the DNA of Kallen and a Honkai beast named "Vishnu".