Growing up, there were no girls of Gwendolyn's age near where she lived, save for Lilina, the daughter of Marquess Hector. The two became acquainted with each other as a result. Later in life, Gwendolyn joined the Ostian Armor Knights, a notably strong sector of Ostia's military, serving alongside her older brother, Bors. During her time as a knight she befriended Barthe, another Ostian Armor Knight who acts as her mentor, Ogier, also part of the Ostian Armor Knights, and Astolfo, an Ostian spy. When a rebellion in Ostia headed by the well-respected general Leygance and a former lieutenant named Devias broke out, Gwendolyn, alongside Barthe and Ogier, were apparently absent from Castle Ostia. They returned, however, to save Lilina, who had been imprisoned and used by the revolutionaries. Upon their arrival, they met up with Roy and his army, who were engaged in a battle with Leygance to stop the rebellion. Under Roy's command, they helped to defeat Leygance, ending the revolution and saving Lilina. Afterwards, Gwendolyn, along with Barthe and Ogier, joined Roy's army on a journey to stop King Zephiel of Bern from eradicating the humans of Elibe. After the war, she continued to serve as an Ostian Armor Knight, rising through the ranks to become their first female captain. Strong willed and straightforward, Gwendolyn sticks to her convictions, even if she neglects the self-disciplining that is required of a heavy knight. Having lost her parents, Bors is the only family she can rely on. Due to being raised in those circumstances, Wendy deeply respects her older brother, and aims to be a heavy knight herself, as it can even be said that she unmistakably personifies the spirit of one, training daily the best she can. On the other hand, despite being proud of being a heavy knight, she has been developing a “girl’s consciousness”, as she worries that people will see her as much larger than she actually is due to the armor she wears.