Elle is an original character created for Rick and Morty: The Anime, serving as a central figure and a romantic interest for Morty. Her background is rooted in tragedy and mystery. She belongs to a unique alien race that the Galactic Federation wiped out due to the potential threat their abilities posed. This ability allows her species to perceive time not as a linear flow from past to future, but as a single, whole entity. From the moment of her birth, Elle can perceive the moment of her death, and she remembers the future just as clearly as she remembers the past. Despite this profound knowledge, a key limitation of her power is that, just as one cannot change the past, she cannot alter the future she sees.

In terms of personality, Elle initially appears as a kind and gentle soul, a blonde girl who forms a deep and immediate bond with Morty. However, her character serves as a deconstruction of the magical girlfriend archetype. Her love for the main universe's Morty is not born from their own interactions but is a projection of her feelings for an alternate version of him from another dimension, often referred to as Space Morty. In that reality, Elle and Space Morty were genuine partners; through her support, he became a galactic hero before tragically dying at the hands of the Galactic Federation. Elle is trapped in a time loop, forced to witness his death repeatedly, and she eventually escapes to the main Morty's dimension to be with another version of her lost love. This revelation adds a layer of complexity to her motivations, demonstrating that her seemingly sweet exterior masks a deep-seated desperation and willingness to make extreme choices to end her suffering. Her desire to break free from fate is so strong that she contemplates destroying her original universe to live a new life with the main Morty.

Elle's role in the story is multifaceted. She is the primary catalyst for the anime's plot, driving Morty to heroic actions across different timelines. Her presence is both a blessing and a curse. While she helps Morty become a hero and liberate worlds from the Galactic Federation, she also places an immense emotional burden on him. Her key relationships are defined by this tragic dynamic. Her relationship with the main Morty is built on a false foundation, as she loves him for the hero she believes he could be or the one she has already lost, rather than who he is. This culminates in a painful choice for Morty, who cannot bring himself to help her destroy another universe nor to destroy her. In a moment of remorse for the pressure she has put on him, Elle makes a heroic sacrifice, merging herself with an entropy device to stop the cycle and save Morty from having to make the decision.

Elle's development throughout the series is defined by her struggle with fatalism. Though she believes in free will for others and can navigate different points in her own timeline, she is largely a passenger to her own destiny until her final act. She begins as a mysterious girl longing for reunion, is revealed to be a broken being projecting a lost love, and ultimately evolves into a self-sacrificing individual who takes control of her own fate in the only way she can. Her notable abilities extend beyond mere foresight; she is a capable warrior who can manipulate time to a certain degree, though not with complete control. She exists non-linearly, appearing in different forms across dimensions, including a version with green skin, blue stripes, white hair, and red pupils. Her unique temporal nature is such that she is intrinsically linked to timeline-altering technology, described as the anti-matter to a time bomb invented by Rick, meaning its use would result in her destruction.