Kiana Kaslana is one of the main characters of HI3, along with Raiden Mei and Bronya Zaychik. She is the adopted daughter of Siegfried Kaslana and the vessel for the second Herrscher—the Herrscher of the Void. Following the events of Chapter 25, she awakened as the Herrscher of Flamescion. Finally, after the events of Chapter 35, her will was approved by the Cocoon of the End, granting her power and allowing her to awaken as the one and true Herrscher of the End.

Raiden Mei is one of the main characters of Honkai Impact 3rd, along with Kiana Kaslana and Bronya Zaychik. She is the 3rd Natural Herrscher of the Current Era and a member of St. Freya's team.