If Aiken is the absolute authority on biology, Fenriru is her counterpart in the fields of engineering and explosions. Fenriru has in her head every abandoned factory in Bifrost Industries' premises as well as every possible method to blow them up. For her, explosions are the ultimate truth, and there's nothing more beautiful in the world than the chemical reactions leading to an explosion. That's why she's been focusing on the study of Echo Crystals—she believes this fissionable substance holds the key to her next breakthrough.