Sigyn is the 25-year-old Queen of Krisna and Hodr's wife and a close friend of Rygart. They went to the same military school as him, where she was known as the "Mad Scientist" for secluding herself in the school's lab for up to 3 days and nights at a time without eating or drinking. She pursues a career of science and cares deeply for her friends, to the point of pointing a gun at Rygart upon first seeing him to ask why he did not show up at her wedding and confirm that he does not hate her. While she is the Queen, she rarely acts like one as she usually spends her time in the castle maintenance workshop tinkering with machines alongside the royal engineers. Even though she and Hodr are married, they both sleep in separate chambers.