Katya "Blue Bolt"

Katya was born into a wealthy family, but contracted the Juvosis disease in her youth and survived with Baldr Inhibitors. Her parents were overprotective and controlling, even preventing her from playing the rock and roll music she loved. This, combined with the bleak state of the world, made her increasingly cynical and callous. She later left home and drifted from place to place as a mercenary. She also developed a fear of heights after falling from a high tower during the Valkyrie Games qualifiers. While serving as an external security specialist after Yggdrasil's Descent, she was eliminated along with the rest of Checker Squad at the Fifth Research Institute and turned into a Titagen ghost. After Checker Squad's revenge plan failed, she surprisingly survived the Resonance and regained her physical form. Rewarded with a new life, Katya decided to put the past aside and enjoy a life of freedom. After reuniting with the Adjutant, she began serving as a mercenary partner of the Heimdall Force. Katya joined the Heimdall Force after the events of Skyward Blaze.