Character introduction[]
Siegfried Kaslana, a knight belonging to the Kaslana family of Schicksal, with the strength equal of S-class Valkyrie. He is the patriarch of the Kaslana family, Kiana Kaslana's father, and the husband of Cecilia Schariac. Siegfried sacrificed to protect Kiana when the Schicksal started the experiment.
Houkai Gakuen 2 mainline[]
Retrospective[]

Siegfried vs the Herrscher in the first game comic
In the retrospective chapter, Siegfried took his daughter Kiana away from Schicksal because of Cecilia's death. During this period, Kiana suddenly became a Herrscher, and Siegfried tried his best to suppress her. When Kiana was 14 years old, Siegfried passed on all the secrets of his family studies to Kiana and then disappeared. Kiana has been looking for her missing father but in fact, Siegfried died soon after.
Otherworld (Original)[]
On the otherworld, Siegfried adopted Kevin Kaslana (Kiana's alternative), who was feared by everyone because of his powerful Houkai control ability. 5 years after adopting Kevin, Siegfried assigned Kevin to monitor and protect the eldest lady of ME and the third Herrscher, namely Raiden Mei. Faced with the question of what Kevin is "protection", Siegfried gave Kevin some advice on the "meaning of protection" and conducted a short period of unreliable pick-up training.
Newborn[]
In the new story, Siegfried, 8 years after the second Houkai War, went out to perform a mission with Cecilia and learned that Kiana's research institute was attacked by the Houkai beast, and immediately rushed to the battlefield. After fighting hard, he finally broke through the mecha troops surrounded by Cocolia and found his daughter, but before the father and daughter had time to say anything, Welt's pursuit had arrived. Although Welt had changed his mind about destroying Kiana at this time, Siegfried was bewildered by the disguised Melin Cavendish and didn't believe in the other party. The two sides broke out in fierce fighting conflict, and finally, Siegfried as a human being defeated Welt's force.
While Kiana, who witnessed her father's injury, was emotionally collapsed, and the Herrscher of the End reappeared. In the face of the overwhelming power of the Final Herrscher, Welt and Siegfried were unable to contend with them, but seeing their daughter encounter this series of changes, his father's sense of responsibility drove Siegfried to stand up again under repeated attacks. Stood up again. The Will of the Houkai was surprised that she was infected by the other party and shed tears. It seems that Kiana's consciousness has resurfaced, and at the same time, Siegfried has also made the final realization. He is determined to sacrifice everything he has to go and take back Kiana. After speaking the last words to Kiana, he activated the highest power of the Judgement of Shamash out of the sheath.

Siegfried was exhausted to death in subspace during the fight with the Will of Houkai
However, in the face of his daughter, Siegfried still failed to use his full strength, after all, the Will of the Houkai laughed at his melancholy and locked him in the subspace with Welt. Afterward, Cecilia entered the subspace to rescue Kiana, Siegfried controlled Kiana, the two worked together to strip Kiana's Herrscher Core, but when the subspace was about to close, Siegfried had already exhausted to death.
After Siegfried's sacrifice, Welt and Cecilia reached cooperation. The "Siegfried" that Kiana had been in contact with was pretended by Melin and Welt.