Fenrys strongly believes in a warrior’s honor and initially despised humans. She viewed Flio’s grief over accidentally killing her brother as dishonorable, unaware of how deeply humans value life. After Flio defeated her, she followed her clan’s law to submit to the stronger warrior rather than choose death. Following her marriage to Flio, Fenrys softened emotionally, becoming more open and relaxed while retaining her fiery temper. She is fiercely possessive of her husband, openly showing jealousy toward anyone who shows romantic interest in him.

Fenrys originally used her human form to deceive adventurers, asking them to escort her to the Delaveza Forest, where nearby demons would ambush them. Through this scheme, she encountered Flio, which ultimately led to the formation of his party and the recruitment of its future members.