TV-Series
Description
A. Einstein is a founding member of the Forest of the Greats, an organization of Returners who seek world peace. Within this group, she is primarily responsible for combat and transport operations and is considered one of the big two at the Forest of the Greats alongside her partner, I. Newton.

In terms of appearance, Einstein is a short, young-looking girl with light-colored eyes and hair. She typically dresses in a professional manner, often depicted wearing a cardigan over a shirt bearing a wheel emblem, paired with black trousers. A notable physical trait is her habit of sticking out her tongue, which is the activation gesture for her primary ability.

Einstein's personality is characterized as strict and highly suspicious, particularly toward new members, which stems from a traumatic event in her past. She harbors a severe and deep-seated dislike for men, to the point where she cannot hide her reluctance when a man so much as touches another woman. Despite her outwardly rude and aggressive demeanor, she is described as being a genuinely kind person, a trait that Newton likens to a tsundere archetype. She has a notable habit of releasing her anger and frustration by physically beating up Newton, who typically endures this punishment as a way to calm her down.

Her background reveals that she was recruited as a child by a man named Senji Seiya to become the fifth member of what would become the Forest of the Greats. A critical incident occurred when Seiya's mind was taken over by an external force, compelling him to order his own members to kill each other. In the ensuing chaos, another member stabbed Seiya, which triggered Einstein to attack in retaliation. Seiya then used his own ability to teleport himself and the other member away from the hideout while they were severely injured, leading the remaining members, including Einstein, to believe they had died. This traumatic betrayal and loss are the direct cause of her deep-seated trust issues with newcomers.

A. Einstein's role in the story is primarily as a powerful ally and a key operative of the Forest of the Greats. Her most important relationship is with her partner, I. Newton. Despite her constant physical abuse of him and her general disdain for men, their bond is one of deep trust and mutual reliance. Newton often acts as a buffer for her emotions, allowing her to punch him until she calms down. In critical moments of battle, they demonstrate a profound care for each other, with each willing to sacrifice themselves to protect the other. Her relationship with other members, such as the strategist Neumann and the healer Nightingale, is more professional, though she shares a camaraderie with her female comrades. Her distrust of the protagonist, Toya Senji, is a notable initial point of conflict, as she openly states that she does not accept his presence in the organization.

Throughout the narrative, A. Einstein experiences significant development, primarily revolving around her ability to trust others. While she remains suspicious of newcomers, her rigid exterior softens as she interacts more with her comrades. A key moment of development occurs when she confronts the revelation that her former leader, Senji Seiya, might still be alive, which throws her into a rage. It is only through the intervention and calming presence of Newton and her other allies that she is able to regain her composure, demonstrating her gradual integration into a new, functional family unit. In later story arcs, she shows a willingness to stand and fight alongside her partner against overwhelming odds rather than flee, signifying her growth from a traumatized individual to a loyal and dependable fighter.

Her notable abilities stem from her incarnation as the famous physicist Albert Einstein. As a Perfect Returner, she is always in her transformed state and wields the talent known as Spatial Transference. By sticking out her tongue, she can transfer herself from one point in space to another by switching the two spaces in less than a second. She can carry several people with her as long as they are close enough when she activates her power. This ability is not limited to self-teleportation; she can use it offensively by transferring only a portion of an enemy's body, effectively bypassing their durability. She can teleport herself and others anywhere on the planet, but this power has a critical limitation: she can only transfer to locations she has personally visited and registered their spatial information. Furthermore, if that registered space is destroyed or significantly altered, she loses the ability to teleport there.