OVA
Description
Carol is the female protagonist of the visual novel Guilty Crown: Lost Christmas, a story set in the same universe as the main anime series. Her character serves as a crucial element to the plot, intricately linked to the scientific experiments that form the backdrop of the narrative.

In terms of background, Carol is a human test subject residing within a secretive research facility. Her name, like that of her male counterpart Scrooge, is a literary reference to characters from Charles Dickens's A Christmas Carol. She is presented as a mysterious and somewhat ethereal young girl, typically appearing in a white coat and a white beret. Her physical resemblance to another character from the broader series is notable, but her own identity is firmly rooted in the events of the Lost Christmas incident.

Carol’s personality is defined by a calm and often playful demeanor, which stands in stark contrast to the grim and violent world she inhabits. She frequently addresses Scrooge in a teasing manner, calling him a greedy and stubborn miser, yet this lightheartedness masks a deep-seated resolve and a profound connection to the horrors of her own existence. Her primary motivation is to escape the facility alongside Scrooge and to support him as his only compatible partner, despite the tragic nature of their bond.

Her role in the story is that of Scrooge’s sole companion and weapon provider. While Scrooge possesses a version of the King’s Power in his right hand, his ability is defective. Anyone else he touches will immediately crystallize and die. Carol is the sole exception to this rule, and she is the only person from whom he can safely extract Voids, which are physical manifestations of the human heart used as weapons.

The key relationship in the narrative is between Carol and Scrooge. Their connection goes far beyond that of simple allies. It is revealed through the story that they were subjected to horrific experiments by the organization Daath, which involved forced genetic interaction between successful test subjects. This is the root cause of Carol’s unique condition. Inside her womb, a cancerous growth has formed, which is essentially an unborn child, a future spirit known as Yet to Come, that is trapped in a perpetual cycle of death and rebirth. This unborn entity is the source of the multiple Voids that Scrooge can extract, explaining why Carol does not die when a Void is destroyed, as a new one is constantly being generated.

Regarding her development, Carol’s character arc is intertwined with uncovering this tragic truth about her own body and her past with Scrooge. Her existence is a testament to the cruelty of the experiments, and her journey involves confronting this reality while maintaining her resolve to escape. Her development leads to different outcomes; in one ending, she and Scrooge are consumed by the apocalyptic event, while in another, they manage to survive and break free from their fate.

Carol’s most notable ability is her function as a living, multi-faceted Void arsenal. Unlike a typical individual who possesses a single Void, Carol’s body contains a host of destructive weapons that Scrooge can extract from her chest. These include various forms such as a great sword, a chainsaw, a holy shroud, a siege crossbow, a holy lance, and a crown of thorns, among others. She willingly offers herself to be used as a weapon, urging Scrooge to use her power mercilessly. This ability is directly tied to her tragic physical condition, making her both a powerful asset and a victim of the genetic manipulation she was forced to endure.