Hirscher, also known as Victor Hilshire, is a German handler working for the Social Welfare Agency in the anime Gunslinger Girl. He serves as the dedicated handler for the cyborg girl Triela. His background is distinct from many of his colleagues, as he did not come from a military or intelligence background in the same way. Before joining the agency, Hirscher was an officer with Europol, the European Union's law enforcement agency, and had also worked as a detective. His career in law enforcement ended in disgrace, as he was fired from Europol for his involvement in helping a mafia boss escape custody. This career-ending event likely contributed to his more jaded but empathetic worldview.

His motivation for joining the Social Welfare Agency is deeply personal and stems from a single, pivotal event. While still working for the police, Hirscher, alongside a female coroner and colleague named Rachelle Belleut, was investigating a human trafficking ring. During an operation to raid a warehouse where a torture session was rumored to be taking place, they discovered a young girl who would later be named Triela. In the ensuing confrontation, his colleague Rachelle was fatally wounded. This traumatic event left a profound mark on Hirscher. The girl they rescued had been brutally abused and was left in a comatose state, receiving no proper care. Driven by a sense of guilt and a desperate need to atone, Hirscher broke his oath as an officer and used his connections to smuggle the girl out of the Netherlands and into Italy. He brought her directly to the Social Welfare Agency, the only organization capable of saving her life, even if it meant condemning her to become a cyborg assassin. To personally ensure her protection and welfare, Hirscher subsequently joined the agency as her handler, swearing that he would save at least this one girl.

In terms of personality, Hirscher is portrayed as a fundamentally decent and gentle man who is somewhat ill-suited for the morally murky world of the Agency. He shares with other handlers, like Jose, a strong aversion to the brainwashing and conditioning that the girls are subjected to, which forces them to be loyal and efficient killers. However, unlike Jose's more paternalistic and emotionally entangled relationship with Henrietta, Hirscher maintains a more awkward and reserved distance from Triela. He sincerely wants to be a good guardian and wishes to have a closer, more affectionate relationship with the girl in his care. Despite this desire, he is often at a loss for how to connect with her. He dislikes forceful methods and struggles with Triela's strong-willed and sometimes cold demeanor, finding her difficult to handle. His innate kindness manifests in small, tangible gestures. After a mission, for instance, he has a habit of giving Triela a small stuffed teddy bear as a gift, a quiet expression of his care that stands in stark contrast to the violent nature of their work.

His primary role in the story is as a supporting character, with his narrative arc deeply intertwined with Triela's development. Their relationship provides a counterpoint to other handler-cyborg pairs in the series. While some handlers treat their cyborgs as simple tools and others develop dangerously dependent emotional ties, Hirscher's dynamic with Triela is marked by mutual respect and a quiet struggle for genuine communication. He acts as her anchor to a semblance of humanity, reminding both Triela and the audience of the terrible cost and the desperate hope that led to her creation. His own past failures and his quest for redemption are mirrored in his day-to-day efforts to care for and guide Triela. He faces the unique challenge of Triela beginning to grow into adolescence, a development that complicates their relationship and forces him to confront her emerging independence in ways that other handlers do not experience.

Over the course of the narrative, Hirscher does not undergo a dramatic personal transformation, but his ongoing development is subtle and consistent. He learns to navigate the delicate line between being an agency handler and a protective guardian. He continues to be frustrated by Triela's emotional blocks, as she often pushes him away precisely when he tries to get closer. Yet, he persists in his efforts, learning to read her silent cues and offer support on her terms. As a testament to his character, Hirscher is one of the more competent and level-headed handlers in the agency. While not the most flashy combatant, he is a capable field operative. His notable abilities lie in his intelligence gathering and tactical experience gained during his time as a Europol officer. He is a strategic thinker who provides calm and effective support to Triela during her missions, trusting her combat prowess while ensuring the operation proceeds without unnecessary risks.