Honkai Impact 3rd and Benghuai Xueyuan character. She was childhood friends with Otto Apocalypse, who would later become the leader of Schicksal we know today. Her father died when she was still young, killed in a fight against the Honkai. In the world of Honkai Impact 3rd, Kallen was one of the descendants of Kevin Kaslana of the Previous Era.
Since then, Kallen was dedicated to protecting people from the Honkai. This raised Otto's fears, as he feared she would die the same way as her father.
When they grew to adults, they were betrothed, as both Kallen and Otto came from two of the influential families in Schicksal, the Kaslana family (the 'Knight') and the Apocalypse family (the 'Bishop'). Such a marriage would unite the two families. While Otto Apocalypse harboured romantic feelings for Kallen, Kallen did not reciprocate.
Within the storyline Yae Sakura and herself existed 500 years in the past with Yae rescuing Kallen after the latter washed ashore on the riverbanks of the Yae village where they developed an intimate relationship with one another.
Otto's obsession with Kallen led to an attempt to clone Kallen, eventually creating a girl he adopted as his grandaughter, Theresa Apocalypse.
Voiced by Mizuki Nana with a positive, and stoic personality.
Kallen Kaslana currently has three Valkyrja forms available in-game:
Ritual Imayoh - A fictional version of Kallen from Otto Apocalypse's Kallen Fantasy videogames. She dons a battlesuit with heavy emphasis on ease of movement - even going as far to remove leg armour allowing her to fully maximise on her kicking combat style. She also has a pair of optical goggles around her neck for use in various situations.
Sixth Serenade - Kallen takes up the guise of shadows to fight against the false light of the Church. Sporting a purple-themed jacket, skirt, and side cut pants allowing her to be extremely fast on the battlefield.
Sündenjäger - An alternate Kallen from a bubble world.
In Benghuai Xueyuan, Otto makes an additional clone of Kallen as an Anti-Herrscher weapon / Artifical Herrscher.
