TV-Series
Description
Fate Testarossa is an artificial human created through Project Fate, an imperfect clone of Alicia Testarossa, the deceased biological daughter of the mage Precia Testarossa. Implanted with Alicia's memories, Fate initially believed herself to be Precia's natural daughter. She endured severe physical and emotional abuse while striving to earn her mother's approval. Her early life involved rigorous combat magic training under the familiar Linith, leading to exceptional proficiency with lightning-based magic. During this period, she created her Intelligent Device, Bardiche, and gained her familiar Arf.

During the Jewel Seed Incident, Fate clashed with Nanoha Takamachi while collecting Lost Logia artifacts under Precia's orders. Defeated by Nanoha, Fate then learned her artificial origins directly from Precia, who explicitly rejected her as a daughter. This revelation caused Fate's emotional collapse. She later reconciled her identity with support from Arf, Bardiche, and Nanoha. Despite Fate's attempt to save Precia from the collapsing Garden of Time, Precia perished. Fate subsequently faced legal proceedings as a material witness but maintained contact with Nanoha.

In the events of A's, Fate served as a temporary contractor for the Time-Space Administration Bureau (TSAB), reuniting with Nanoha to combat the Wolkenritter. Her device, Bardiche, upgraded to "Bardiche Assault," incorporated a cartridge system to enhance combat effectiveness against Belkan-style weapons. Fate's fighting style evolved into a Fragile Speedster approach, emphasizing high-speed maneuvers over endurance. She balanced magical duties with civilian life on Earth, attending school as a transfer student and forming friendships within Nanoha's social circle. Mutual respect during battles fostered a bond between Fate and Signum of the Wolkenritter.

Following A's, TSAB Admiral Lindy Harlaown formally adopted Fate, who changed her name to Fate Testarossa Harlaown. Over the next decade, she became an elite TSAB Enforcer, specializing in cases involving exploited children. She adopted Erio Mondial, a fellow clone, and Caro Ru Lushe, an exiled summoner. Fate later became a co-parent to Vivio Takamachi alongside Nanoha. As a captain in Riot Force 6, she led the Lightning Squad with Erio, Caro, and Signum. An encounter with Jail Scaglietti, Project Fate's architect, forced Fate to confront similarities between her actions as a guardian and Precia's exploitation of her. Overcoming this crisis with support from her children, Fate transferred to Special Duty Section 6 to investigate the Eclipse Incident.

Fate's personality is defined by seriousness, protectiveness, and lingering self-doubt stemming from her artificial origins. She exhibits intense concern for others' safety, particularly Nanoha following a near-crippling injury, and adopts a more permissive parenting style compared to Nanoha. Though initially reserved, she gradually expresses warmth and occasional shyness. Her commitment to preventing child suffering drives her professional choices. Her combat prowess centers on lightning-fast aerial tactics, earning recognition as one of the TSAB's top mages.