Sven was once an elite agent of the International Bureau of Investigation (IBI), where he was known for his sharp mind and exceptional detective skills. His life, however, took a tragic turn when he was forced to kill his corrupt partner, Lloyd Goldwynne, who had betrayed the agency. This event left a deep emotional scar on Sven, making him disillusioned with the law and justice system.

During the incident, Sven inherited the “Vision Eye”, a special ability implanted in him by Goldwynne, allowing him to see a few seconds into the future. Though this power gave him an edge in battle, it also came with severe physical strain, limiting how often he could use it.

After leaving the IBI, Sven became a sweeper (bounty hunter), using his investigative skills and combat expertise to track down criminals for money. However, unlike most sweepers, Sven follows a strict code of ethics, refusing to kill his targets, instead finding creative ways to subdue them non-lethally. His path eventually leads him to Train Heartnet, an ex-assassin who joins him on his journey, forming an unlikely but effective partnership.

Sven is a tall, lean man with short, spiky blond hair and green eyes. He typically wears a fedora hat and a long trench coat, giving him a classic detective-like appearance. His signature look is completed by a monocle over his right eye, which conceals his “Vision Eye” ability.

Though he often appears rugged and tired, Sven maintains a confident and charismatic aura, reflecting his experience and intelligence as a former investigator. His attire and mannerisms further emphasize his gentlemanly persona, setting him apart from his more reckless and carefree partner, Train.

Sven Vollfied is a mature, responsible, and highly intelligent individual, acting as the voice of reason in the sweeper trio. Unlike Train, who is often reckless and carefree, Sven is pragmatic, resourceful, and always thinking several steps ahead. His background as an IBI agent gives him a strong sense of justice, and he adheres to a strict personal code that prevents him from killing, preferring non-lethal takedowns and strategic planning over brute force.

Despite his serious and disciplined nature, Sven has a kind heart, often going out of his way to help those in need, even when there’s no financial reward involved. He takes on a paternal role toward Eve, treating her like a daughter, guiding her toward a more human existence rather than letting her be seen as a mere weapon. His protective instincts also extend to Train, as he frequently scolds him for his reckless behavior, though deep down, he cares for Train as a close friend and partner.

While he projects an image of calm and control, Sven occasionally loses his patience, especially when dealing with Train’s antics or when his plans go awry. He also has a lighthearted and humorous side, often making sarcastic remarks or reacting comically to absurd situations. His ability to balance seriousness with humor makes him a compelling and likable character, standing out as the backbone of the sweeper trio.

• Becoming a Sweeper
  After leaving the IBI, Sven starts working as a sweeper, using his detective skills and combat expertise to hunt down wanted criminals for bounties. Unlike most sweepers, however, he refuses to kill, believing that justice should be served without resorting to murder. His path crosses with Train Heartnet, whom he eventually teams up with after Train leaves Chronos.

• Meeting Eve
  Sven’s life takes a significant turn when he encounters Eve, a genetically-engineered bio-weapon with nanomachine-enhanced abilities. While others see her as nothing more than a tool for destruction, Sven sees her as a child who deserves a real life, choosing to mentor and protect her rather than exploit her powers. His compassion and guidance play a crucial role in Eve’s journey toward becoming more human.

• Guiding Train’s Transformation
  As Train’s partner, Sven helps Train transition from a ruthless assassin to a more carefree and lighthearted bounty hunter. While they often butt heads due to Train’s impulsiveness, Sven provides much-needed guidance, ensuring that Train doesn’t revert to his old ways.

• Confronting Creed Diskenth
  Sven becomes deeply involved in the battle against Creed Diskenth, the leader of the Apostles of the Stars and Train’s deranged former admirer. Using his sharp intellect and strategic mind, Sven helps devise plans to counter Creed’s growing threat, playing a crucial role in the final confrontation against him.