Jeanne, whose full name is Jeanne E. Anise, is a central character whose fate is deeply intertwined with the rewritten history of her world. She is depicted as a young woman of striking appearance, most notably recognized by her long, flowing silver hair, and often seen wearing distinctive armor that has led to comparisons with symbolic figures from history.

In the original version of the world, the one that was lost, Jeanne was the childhood friend and next-door neighbor of the protagonist, Kai Sakura Vento. She was considered a brilliant elite, already entrusted with important duties in the royal capital, which speaks to her high level of competence and dedication from a young age. Despite this serious and accomplished exterior, she also possessed a more childish and approachable side, maintaining a very close and familiar bond with Kai, underscored by a scene where the two are celebrating her birthday together just before the world's transformation.

The character's personality is multifaceted. On one hand, she is a figure of authority and a source of hope for humanity, taking on the role of a leader and commander of the human rebel forces in the city of Urza within the new, devastated world. In this capacity, she demonstrates strong leadership qualities and a diplomatic mindset, often bringing a sense of strategy and negotiation to the group's efforts. On the other hand, she also displays a more enigmatic and mysterious side, which contributes to her captivating presence as she navigates the challenges of a world that has been inexplicably altered.

Jeanne's fundamental motivation stems from her role as a beacon of hope for humankind. In the rewritten world, where humanity lost a great war and lives on the brink of extinction, she is regarded as a symbol of resistance and a key fighter for the survival of her race. Her actions are driven by the need to challenge the new world order and fight against the powerful forces, such as dragons and demons, that now dominate the earth. Her unwavering determination and unrelenting spirit fuel her perilous journey to alter this grim destiny.

Her role in the story is that of a crucial ally and companion to the protagonist, Kai. After the world is overwritten, she joins him and another key character, Reiren, on their quest. While Kai is the only one who remembers the original world, Jeanne represents the best of what humanity can be in the current, harsher reality. She is not merely a follower; her leadership and tactical acumen are vital assets to the group as they face both physical battles and complex moral dilemmas. The bonds she shares are most significant with Kai, rooted in their shared past as neighbors and fellow cadets, a connection that persists even after the world's history has been changed around them. Her relationship with her other companions is built on mutual respect and shared struggle in their fight for survival.

Regarding her development, information is limited, but she transitions from a promising young cadet in a peaceful world to a hardened leader of a resistance force in a post-apocalyptic one. This shift suggests a profound adaptation to a new reality, where her innate talents are forged into the skills of a commander and frontline warrior.

As for notable abilities, Jeanne is described as a powerful heroine with extraordinary abilities that distinguish her in this world. Her combat prowess is demonstrated through her direct participation in intense battles alongside Kai. Her true strength, however, may also lie in her leadership and strategic mind, which bring a crucial element of diplomacy and organization to the resistance's efforts. While the full scope of her powers is not specified, she is consistently portrayed as a formidable fighter and a linchpin for the human cause.