Kallen Kaslana

Kallen Kaslana is one the protagonist of the videogame series Honkai Impact 3rd and Guns Girl Z and a posthumous protagonist from the manhua adaptation.

History
Kallen Kaslana, born in 1453, was the eldest daughter, and the 29th member of the Kaslana family.

Kallen was the best soldier in the family. At the age of 16, Kallen passed the Captain Valkyrja test, becoming the Valkyrja's collaborator for the Shicksal.

In the following 8 years, she stood at the forefront of the fight against the Houkai. She has sealed more than 1000 Houkai beasts, and became the hope of Shicksal against the Houkai. In recognition of her accomplishments, Shicksal made her "Judah's Oath", the only weapon she could use. (Judah's Oath was actually sent to Otto before he gave it to Kallen).

It was not until 1477 that Kallen deviated from the Order of the Knights when she saw the inhuman experiments of Shicksal using the Crystal Disillusionment. She then stole the Houkai Crystal box and ran away to the East when she was wounded and was found by Yae Sakura. The two became friends and formed an intimate relationship, but Yae became a pseudo-Herrscher due to the influence of the box.

After fighting with the Will of the Honkai in the box and sealing her beloved away, Kallen was seriously wounded. The Fatal Intelligence Unit soon caught up to Kallen and apprehended her and brought her back to the European Council. She professed her love to Yae, and that she was innocent. Regardless, she was sentenced to death for her betrayal. Otto Apocalypse released Honkai beasts on the day of her execution in a final attempt to save her, not wanting to see her die. Kallen slapped Otto for acting reckless and stayed behind to protect the innocent civilians, before being killed by a Honkai beast as she was still weakened.

This would cause Otto to recreate Kallen due to her fighting capabilities, resulting in the creation of multiple clones including "A-310", who Otto believed to be a reincarnation of Kallen due to the many traits she shared with her.