TV-Series
Description
Rein Kashiwagi, alias Rain, enters Darwin's Game as a first-year middle school student, quickly establishing herself as an information broker. Her accurate analysis earns her the nickname "Analyst" for trading vital game intelligence. She later rises to become the deputy leader and a core strategist of the Sunset Ravens clan.

Her appearance features medium-length black hair in a bob cut and purple eyes (depicted as blue in the anime), marked by a distinctive beauty spot beneath her left eye. She typically wears a light-colored shirt under a black one-piece skirt outfit with dark stockings, adding a large light-colored coat during combat. After a timeskip, her style evolves to a hooded jacket, black tights, and practical shoes.

Despite her youth, Rein exhibits notable maturity, serving as a calm voice of reason in crises. Analytical and insightful, she prioritizes strategic avoidance over direct conflict, adhering to a survival philosophy of flight before fight. She dislikes being called a child, correcting others to emphasize her status as a first-year middle school student, later asserting her adulthood post-timeskip. Internally, she navigates a duality between emotional impulses and detached logical observation, likening it to depersonalization. This detachment aids her in high-pressure situations, though she acknowledges envy toward those who express emotions freely. She harbors a fondness for nattō-flavored Umaibō snacks, viewing them as an energy source.

Her background includes her parents' divorce two years before the series, after which she stayed in Japan with her mother. Classmate Tachikawa Mio introduced her to Darwin's Game. Her first major in-game challenge was the Treasure Hunt event, where she allied with Kaname Sudō to escape a hostile hotel. This alliance led directly to her joining the Sunset Ravens, where she dedicated herself to analyzing the game's mechanics and devising strategies to end it.

Rein's primary power is her Sigil, "Laplace" (also known as "World Function" or "Laplace's Demon"). It enables instantaneous calculation of physical vectors and probabilities, allowing her to predict the precise position and momentum of objects and people. This grants limited precognition, letting her dodge attacks like bullets and land sniper shots under adverse conditions. "Internal observation" accesses cumulative human knowledge to decipher codes or solve complex problems, requiring intense focus and stillness. Its effectiveness wanes against unpredictable phenomena like teleportation.

In combat, she relies on firearms over physical strength. A confirmed expert sniper capable of hits exceeding 2,000 meters, her arsenal includes pistols (CZ 97B, Minebea PM-9), rifles (Steyr SSG 69, M110 SASS), grenades, and an electric baton, summoned via the game's app. Post-timeskip, she demonstrates improved athleticism, executing maneuvers like flipping onto moving vehicles. Following Shidou Izaya's death, she becomes the Guardian of the World Branch for World Line N, gaining abilities to teleport individuals and grant Sigils, though excessive use causes fatigue.

Rein evolves from information broker to pivotal Sunset Ravens strategist. Over five years, she serves as acting leader during Kaname Sudō's absences before formal appointment as deputy leader. Her responsibilities expand to safeguarding civilians during threats like the Greed invasion. She features in a post-game side story, underscoring her enduring significance. She shares a close professional trust with Kaname Sudō, collaborating on strategy, and builds friendships within the clan, notably with Suzune Hiiragi after Suzune's father's death. Her analytical mind makes her indispensable to clan operations.

Born on May 1st with blood type A, she ranked first in the series' inaugural character popularity poll.