Lindy Harlaown commands the Time-Space Administration Bureau spaceship *Arthra* with the rank of admiral during the first season's events. She leads investigations into dangerous dimensional incidents involving Lost Logia artifacts like the Jewel Seeds. Demonstrating leadership, she deploys her son Chrono to probe disturbances and coordinates crew operations, maintaining a calm demeanor under pressure. Her command style blends military discipline with genuine concern for her crew's well-being, reflecting her perceptive understanding of human emotions. Her personal history includes marriage to Clyde Harlaown, who died during the Book of Darkness incident in 0054. Following the first season, she becomes Fate Testarossa's legal guardian, formally adopting her in April 0066 after assessing Fate's emotional readiness. She later extends this guardianship to Erio Mondial in 0069, acting as his legal guardian due to Fate's young age. As a parent, she provides guidance to Fate on parenting challenges with Vivio, emphasizing open communication and trust. Professionally, Lindy transitions from frontline command to administrative roles. After retiring as captain of the *Arthra* in late 0066, she transfers to the Administrative Bureau Main Office under the General Affairs Department. By the time of *StrikerS*, she holds the position of General Affairs Administrator and supports Riot Force 6 operations from this bureaucratic capacity. Her operational expertise includes tactical decisions such as deploying the Arc-en-ciel superweapon during critical missions. As a combat mage, Lindy specializes in Midchildan magic with a "Fullback Supportive" style focused on defense and support. Her known spells encompass Distortion Shield for ceremonial defense, Ring Bind for capture, and Sonic Move for transportation. During high-stakes situations, she channels massive amounts of mana, sometimes manifesting temporary green wings while suppressing dimensional distortions. In the movie continuity, she wields the Intelligent Device Durandal. Alternate continuities present distinct interpretations. In *INNOCENT*, Lindy co-manages Hobby Shop T&H with Precia Testarossa as close friends. Her *Brave Duel* avatar references her legendary admiral status from fleet simulation games. The *Lyrical Toy Box* prototype depicts her as Chief Administrative Officer of Midchilda, appearing as a miniature winged fairy who gives Nanoha the Raising Heart device.