OVA
Description
Emilia appears during a respite at Roswaal Manor in "Re:ZERO -Starting Life in Another World- Memory Snow," participating in a snow festival combating unusual cold from Puck's mana release. She crafts snow sculptures alongside Subaru, Rem, and Ram, displaying childlike enthusiasm. At the festival banquet, she accidentally consumes spiked drinks meant for Subaru, exhibiting playful intoxication before falling asleep using his lap as a pillow. The OVA concludes with her enjoying a postponed date with Subaru in a special outfit.

A silver-haired half-elf, Emilia bears a striking resemblance to the feared Witch of Envy, Satella, subjecting her to severe societal prejudice and discrimination across Lugunica. Her early life involved isolation in Elior Forest under the care of her aunt Fortuna and a father figure named Geuse. A traumatic attack by Pandora and Regulus resulted in Fortuna's death and Geuse's descent into madness, becoming the Sin Archbishop of Sloth, Petelgeuse. Grief-stricken, Emilia unleashed uncontrollable magic, freezing the entire forest and its inhabitants, including herself, for an unspecified period. Pandora altered her memories of these events.

Driven partly by atonement, Emilia participates in Lugunica's Royal Selection aiming to become ruler. Her goal is to create an equal society and use the kingdom's resources, specifically the Dragon's Blood, to thaw Elior Forest safely. Initial public perception is overwhelmingly negative due to her heritage and resemblance, improving somewhat after her camp helps defeat the White Whale and Petelgeuse.

Personality-wise, Emilia exhibits innate kindness and a chronic desire to help others. Despite facing hatred, she strives to be judged as herself. Moments of childlike naivety stem from her sheltered upbringing, sometimes leading to adorkable behavior, especially around Subaru. However, she possesses stern resolve in combat, willing to kill threats. She experiences deep worry for Subaru's safety, causing significant conflicts over his recklessness. While generally pure-hearted, she shows brief flashes of jealousy and possesses low alcohol tolerance.

Her primary abilities involve high affinity for spirit arts and ice magic. She formerly contracted the Artificial Spirit Puck under specific pact conditions, including his active hours and her hairstyle. After Puck breaks their contract during Sanctuary events, she stores him in a new Pyroxene Crystal and learns to use magic independently. She commands numerous quasi-spirits and demonstrates potent ice magic: "Huma" (ice barriers), "Ul Huma" (massive ice pillars), "Al Huma" (ice spears), and "Ice Brand Arts" (conjuring/manipulating ice weapons). A specialized technique, "Ice Flower," creates blood-sucking ice flowers on wounds. Her most devastating feat remains the accidental freezing of Elior Forest.

Significant development occurs during Sanctuary trials. Forced to confront sealed memories, she initially suffers mental breakdowns but ultimately overcomes them, regaining her past and the ability to wield magic without Puck. This period involves temporary, destructive possession by the Witch of Envy. Later, during the Pleiades Watchtower arc, the Sin Archbishop of Gluttony devours her existence and name. This erasure causes physical pain and confusion in allies like Ram when they try to recall her, highlighting the profound void left by the loss of her identity and bonds.

Relationships are central. She deeply values Subaru as her primary emotional support and knight, frequently clashing over his self-sacrificial tendencies. She shares a warm, complex master-servant bond with Ram. Puck served as her emotional crutch and protector; his existence revolved around her, and her death would trigger his rampage to destroy the world. Forming genuine friendships is difficult initially due to prejudice, but she gradually builds connections within her camp.