Voiced by Erin Fitzgerald

Olwen makes her first appearance in Chapter 10 of Thracia 776 when she and her subordinate, Fred, are working on surveillance duty at Noel Canyon. In their scene with Largo, it is revealed that Olwen has a strong dislike for Kempf, who despises her out of envy towards Reinhardt. When Noel Canyon is attacked by Leif's army, Olwen and Fred fight against them for a short while, but eventually decide to leave in order to ask Kempf for reinforcements.

At the start of Chapter 11, Olwen requests reinforcements from Kempf, who points out her failure to identify the enemy army that attacked Noel Canyon. Once Kempf openly shows his disregard for Largo's life, she speaks out against him in shock. After he taunts her and claims that Reinhardt's greatest skill is seducing women, Olwen attacks Kempf out of anger, causing him to label her as a traitor. Following her imprisonment in Dandrum Fortress, Kempf reveals that he intentionally provoked her in hopes of removing Reinhardt from his position. He also uses Olwen as a hostage to force Fred to fight against Leif's army to the death.