Beatrice

Name: Beatrice

Gender: Female

Species: Artificial spirit

Apparent Age: 11–12 years old

Actual Age: Over 400 years old

Height: 140 cm

Weight: Heavier than the Grand Dictionary (a running gag; exact weight unknown)

Position/Role: Librarian of the Forbidden Library in Roswaal L. Mathers’s mansion; later Subaru Natsuki’s contracted spirit

Affiliation: Roswaal L. Mathers’s mansion, Subaru Natsuki’s camp

Favorite Things: Cute things

Dislikes: People who approach her without any sense of personal space or boundaries

First-Person Pronoun: “Beatrice” (she refers to herself by name)

Usual Second-Person Pronoun: “You” (in a blunt, sometimes dismissive tone)

Nicknames: “Betty,” “Beako” (used by others)

Voice Actor (Japanese): Satomi Arai

Beatrice appears as a very young girl dressed in a luxurious frilly dress that gives off a noble, doll-like impression.

She has long blonde hair styled into distinctive drill-shaped twin-tails, making her instantly recognizable.

Her irises are uniquely shaped like butterflies, emphasizing her inhuman, otherworldly nature as a spirit.

Overall, her look is that of a refined, aristocratic doll combined with the cuteness of a small child.

On the surface, Beatrice is cold, aloof, and high-handed, often speaking in a sharp, condescending tone.

She avoids calling people by their names and instead labels them with descriptive titles such as “half-demon girl” for Emilia or “younger twin sister” for Rem, which underscores her emotional distance.

She frequently uses feminine sentence endings in her speech pattern, giving her a somewhat theatrical and old-fashioned feel in contrast to her childlike appearance.

This unique speech style and her brusque manner make her come off as a classic haughty, highborn girl.

Despite her attitude, Beatrice is fundamentally kind-hearted and very much a tsundere.

She complains constantly, yet still ends up helping and looking after others, making her an unintentional caretaker.

Deep down she is stubborn, lonely, and not good at being honest about her feelings.

Centuries of waiting alone in the Forbidden Library made her increasingly pessimistic and self-destructive, to the point where she tried to detach herself from events around her rather than be hurt again.

She loves cute things, which fits well with her own adorable appearance, though she tries not to show that openly.

Her loneliness and tsundere nature make her easily flustered when someone shows her sincere care or affection.

Beatrice serves as the librarian of the Forbidden Library, a hidden room within Roswaal L. Mathers’s mansion.

This secret library contains countless forbidden or special books, and Beatrice is its guardian and administrator.

Her signature ability is “Door Crossing”, which allows her to freely move between doors within the mansion.

By choosing a destination, she can link any door in the mansion to the Forbidden Library or to another place under her influence, making her very hard to track down.

Beatrice is an exceptionally powerful spirit who excels in yin (shadow) magic.

She can use a wide variety of advanced and even lost techniques, making her one of the strongest magic users in the series under the right conditions.

Within the influence range of the Forbidden Library and the mansion, Beatrice can fight on nearly equal terms with Roswaal L. Mathers, a top-tier magic user.

However, once she leaves that environment, her overall power decreases significantly, making her much weaker than her “home turf” version.

After a year of training together with Subaru following the Sanctuary incident, Beatrice develops her own original spell.

This magic allows her to shift her existence by half a step out of the world, creating a unique, difficult-to-interact-with state that can be used both defensively and strategically.

Subaru Natsuki

Initially, Beatrice finds Subaru pushy, noisy, and a major source of irritation, constantly calling him out and acting like she wants nothing to do with him.

However, she repeatedly steps in to save and support him, revealing her underlying kindness.

Over time, Subaru becomes the person who reaches out to her most persistently, refusing to abandon her isolation in the Forbidden Library.

In the decisive moment, Subaru begs her to choose him, offering a new contract and a reason to leave the library and live in the outside world.

After she accepts Subaru’s contract, she starts calling him by his actual name, marking a clear shift in their relationship.

They fight together against the Great Rabbit, and their bond deepens as they share multiple battles and hardships side by side.

Subaru treats Beatrice like family, often like a daughter he cherishes and spoils in his own clumsy way.

Beatrice, in turn, opens her heart fully to him and becomes one of his most loyal and trusting partners.

By the time of the fifth arc, their relationship is that of true partners and close family.

Beatrice trusts Subaru so deeply that even when he cannot fully explain where his information comes from, she accepts it simply because “Subaru told her,” and that alone is enough proof for her.

Pack

Beatrice and Pack share a special connection, as both were created by Echidna.

Beatrice affectionately calls him “big brother,” and in front of him she shows a much more innocent, childlike side.

With Pack, Beatrice behaves with less of her usual prickly front and more open warmth.

Their relationship emphasizes that despite her age and power, she still craves simple familial affection.

Emilia and Others

At first, Beatrice avoids using the names of people like Emilia or Rem, preferring distancing labels.

For example, she refers to Emilia as “the half-demon girl” and to Rem as “the younger twin sister,” which keeps everyone at arm’s length.

After forming a contract with Subaru and gradually integrating into his group, her attitude softens.

She eventually starts calling Emilia by name as well, showing that Emilia has truly become someone important to her beyond mere obligation.

Within Subaru’s faction, Beatrice is both a powerful combat asset and an emotional support presence.

She often delivers harsh words but follows them up with concrete help, fitting her tsundere, “complaining caretaker” archetype.

Her behavior, appearance, and constant proximity to Subaru lead others to nickname him a “little-girl handler” or “user of little girls.”

This reputation spreads because Beatrice is widely known as his contracted spirit and is so obviously a small, cute girl attached to his side.

Beatrice’s true identity is that of an artificial spirit created by the Witch of Greed, Echidna.

Four hundred years before the main story, Echidna made a promise with Beatrice that she would someday meet “a certain person” in the Forbidden Library.

Beatrice spent centuries alone in the library, faithfully waiting for this unspecified “someone” who would come for her.

As time passed and no one appeared to match that role, she became consumed by loneliness, frustration, and despair.

This emotional burden led her to become increasingly apathetic and self-destructive.

She began to shut herself off from the world, choosing not to interfere even when crises descended on the people around Roswaal’s mansion or Emilia’s camp.

Roswaal L. Mathers kept her and the library as part of his long-term plans, and through his scheming, the assassin Elsa Granhiert was indirectly led to the mansion.

At one point in the story, the Forbidden Library itself is set ablaze by Elsa, symbolically destroying Beatrice’s “cage” and forcing a turning point in her life.

Around the same time, Subaru’s gate (the organ that channels mana) becomes damaged, threatening his life and changing the mana dynamics between them.

All these situations intersect to push Beatrice into choosing Subaru and leaving behind her centuries of waiting.

The famous line Subaru shouts—essentially “Choose me, Beatrice!”—becomes the emotional peak of this turning point.

The series’ author has stated this scene is among his favorites and even designated the anime broadcast date of this episode (March 17) as Beatrice’s commemorative day.

Beatrice specializes in yin attribute magic, often referred to as shadow or darkness magic.

Her skill level is extremely high, and she can cast advanced spells and even long-lost techniques.

Her power set includes:

Door Crossing: Free movement between doors in an area, allowing instant relocation and making intruders easy to confuse.

Various high-level offensive and defensive spells rooted in shadow and spiritual magic.

Inside the mansion and especially within the Forbidden Library, Beatrice can tap into the environment’s special properties.

This boosts her abilities greatly, to the point she can go toe-to-toe with Roswaal L. Mathers in a serious confrontation.

Outside her home territory, her raw power and endurance drop significantly.

She is still formidable but nowhere near the overwhelming force she is when anchored to the library.

After forming a contract with Subaru, her mana source changes.

Instead of drawing from the mansion’s special environment, she primarily relies on mana supplied by Subaru, creating a mutual dependency.

About a year after the Sanctuary arc, Beatrice and Subaru undergo intensive training together.

Through this process, Beatrice creates her own original spell that lets her shift her existence half a step out of alignment with the world, a unique technique with many tactical applications.

Beatrice’s long-standing promise with Echidna was that she would stay in the Forbidden Library until “that person” appeared.

This undefined condition kept her trapped emotionally and physically for centuries.

When Subaru confronts her at her lowest point, the library is burning, his gate is damaged, and both of them stand at a crossroads.

Subaru offers her a new promise: to choose him, to leave the library, and to walk the world together rather than remain waiting forever.

Moved by his desperate, heartfelt plea, Beatrice finally abandons the empty promise that had bound her for 400 years.

She forms a new contract with Subaru, stepping out of the Forbidden Library and into a new life.

From that moment on, she and Subaru share a deep, mutual bond founded on choice rather than obligation.

They soon prove the strength of this partnership by successfully defeating the monstrous Great Rabbit together.

Their new contract also means Beatrice’s primary mana supply comes from Subaru.

As a result, they often stay close to each other physically, reinforcing their image as an inseparable duo.

In the fourth arc (adapted in the second season of the anime), Beatrice’s true nature as Echidna’s artificial spirit and her centuries of isolation are fully revealed.

The burning of the Forbidden Library, Subaru’s gate problem, and Roswaal’s machinations all converge in the episode where she chooses Subaru and leaves her confinement.

Following these events, her demeanor slowly softens.

She still talks in a sharp, haughty way, but the warmth behind her words becomes increasingly obvious.

By the fifth arc, Beatrice is widely recognized as the contracted spirit of “spirit knight” Subaru Natsuki, paralleling the role of Julius Euclius, another spirit knight.

Because Subaru’s partner is a tiny, aristocratic-looking girl, he gains the notorious nickname of a “little-girl handler” or similar teasing titles.

Their interactions often become very affectionate and comedic.

They tease each other, rely on each other, and share many lighthearted moments that show just how close they have become.

Beatrice’s speech and behavior gradually shift toward something more fitting her apparent age.

She starts sounding and acting like a truly young, adorable girl who is comfortable expressing affection—especially around Subaru.

Her trust in Subaru deepens to an extraordinary level.

Even when he cannot reveal the source of his knowledge due to circumstances, she is satisfied with “Subaru told me” as her sole reason to believe.

She also begins to call Emilia by name, reflecting the growth of genuine bonds within Subaru’s camp.

From a lonely librarian who refused to get involved, Beatrice becomes an irreplaceable partner and emotional pillar for the group.

In the spin-off parody series often called Re:Zero – School, Beatrice appears in a modern school setting.

In this alternate universe, she is portrayed as Subaru’s younger sister.

This spin-off reimagines many of the characters in comedic, everyday school-life scenarios.

Beatrice’s tsundere traits and her attachment to Subaru remain, but they are played for humor in a lighter, less life-or-death context.

The Forbidden Library is Beatrice’s long-time domain, a hidden room in Roswaal’s mansion accessible only through specific doors.

It contains countless unusual and forbidden books, making it both an archive of dangerous knowledge and Beatrice’s long-standing prison.

Beatrice spent hundreds of years there, rarely leaving and rarely interacting with others.

This extreme isolation shaped her into someone who prefers to watch from the sidelines rather than involve herself in others’ problems.

Her core conflict revolves around the tension between her desire to be “rescued” and her fear of being disappointed again.

Subaru’s intervention and their new contract finally free her from that emotional stalemate.

Even after leaving the library, the trauma of her long solitude lingers, influencing how she clings to Subaru and values the bonds she has gained.

Her story arc is therefore heavily centered on themes of waiting, promises, loneliness, and the courage to choose a new future.