Satella // She saved you from death

Satella is the Witch of Envy responsible for the Great Calamity 400 years ago who is currently sealed in the Evil Sealing Stone Shrine, located somewhere in the Augria Sand Dunes, close to where the Pleiades Watchtower is currently standing. In reality, the Witch of Envy is a separate personality that formed when she took in the incompatible Witch Factor of Envy. Satella formally debuted in Arc 4 as a supporting character, whilst the Witch serves as an overarching antagonist throughout the series, appearing in most arcs so far, one way or another.

She possesses a yet-unexplained connection to both Subaru and Emilia. Throughout the series, the Witch silences Subaru whenever he attempts to talk about his Authority. Satella herself did not debut until Arc 4, where she and the other Witches helped Subaru accept himself and change his views on Return by Death.

In the years predating the Great Calamity, Satella travelled alongside Echidna, Flugel, Reid Astrea, Farsale Lugunica, and Alec Hoshin for unknown reasons, though according to Alec, it was a journey to save the world. According to Echidna, at the time of their travels, they needed to keep their identities secret. However, at one point during their travels, they ended up in the country of Magrizza. After Farsale declared his own name, the royal family discovered them and invited them to their castle. The crown prince, enamored by Echidna, went behind the scenes to arrange a marriage between himself and Echidna, with Echidna's party being mostly unaware. However, at some point, for reasons yet to be explained, Reid and Volcanica went on a rampage, ultimately resulting in the marriage being cancelled and them being driven from the nation. It was a short time later that they learned that the Black Serpent destroyed Magrizza. According to Echidna, it was likely that they were being chased by the Black Serpent.

400 years ago, Satella absorbed the Witch Factor of Envy, which she had no compatibility with, resulting in the creation of her Witch of Envy personality. However, this alternate personality was not the reason for her subsequently going out of control and killing countless innocent people and nearly destroying the world. Despite the efforts of many, including the Divine Dragon, the First Sword Saint, and the Sage, Satella was unable to be killed and was instead sealed in a shrine that was watched over by Shaula until the end of Arc 6. Currently, the Pleiades Watchtower and Evil Sealing Stone Shrine are being watched over by the Divine Dragon itself, Volcanica.

Despite being physically imprisoned near the Great Waterfall, Satella somehow maintains a link to Subaru's body and is constantly aware of his actions, even managing to manifest in the shape of a shadowy figure of varying sizes multiple times throughout the story.

Satella, according to legend, is a half-human/half-elf demi-human woman with silver hair and eyes that are amethyst with a bluish tint to them. As a half-elf, Satella's ears are noticeably pointed. When she manifested before Petelgeuse in a realm devoid of light, the details of her face and the shape of her body were both obscured by pitch-black veils made out of mist. The mist that engulfed her form was so impossibly dark that it blotted out the darkness of the realm. In this state, Satella's eyes can be seen glowing brightly in contrast to the rest of her form.

Beyond the shadows that obscure her appearance, Satella wears black thigh-high socks with orange frills on the top, a black one-piece mini-dress with orange flower decorations, and a long dark veil that covered a part of her face. Additionally, she also has a pair of earrings and an orange and black eight-pointed star hairpiece.

When she attacked the Sanctuary in Emilia's body, Satella's form was once again obscured. Although the contours of her body were difficult to ascertain, the shadows surrounding her made her seem as though she wore a dress of darkness and had long raven-black hair. Her voice was muffled to the point that it was difficult to distinguish whether it belonged to a man or a woman.

When Subaru encountered her at Echidna's tea party, she wore a black dress made of shadows that seemed to wave in accordance with her heartbeat. Initially, he was unable to see her face because of a black shadow covering her above her neck, which was created out of his reluctance to accept her. However, he later accepts her and becomes able to see her face, mentioning afterwards that she looks exactly the same as Emilia.

Contrary to popular belief, Satella and the Witch of Envy are separate personalities, formed when she took in an incompatible Witch Factor. The two personalities tend to fight each other. Both personalities love Subaru, though the Witch of Envy personality is much more aggressive about it, while Satella is much more reasonable and cares deeply about his well-being, with the love both feel for Subaru being the reason they gave him Return by Death, to prevent him from truly dying.

According to Beatrice, the Witch of Envy was starved for love before her imprisonment. For unknown reasons, the Witch is obsessively in love with Subaru, who, to his knowledge, had never met her before in his life. In the shadow world she calls home, Satella would simply sit idly and monotonously repeat the words "I love you" over and over again, seemingly swamped by her own obsessive feelings of love towards Subaru. She is incredibly possessive over Subaru, as she won't allow him to tell anyone else the secret of Return by Death. The Witch seems to have no remorse, nor does she pay attention to anyone other than Subaru, as she didn't hesitate to execute Emilia when Subaru told her about Return by Death, and when she later saw Petelgeuse within the world meant solely for Subaru and herself, her rage swelled, and she was quick to violently banish the spirit from their world. If the secret of Return by Death is revealed to another person, the Witch will find a method of bypassing her imprisonment and slaughter all of Subaru's allies in that timeline, presumably as a form of strong reprimand fueled by her possessiveness. Although she usually pays no heed to the words of anyone, including Subaru's, she once took noticeable offense after Subaru told her that he preferred the other Witches of Sin over her.

Alec Hoshin described Satella as an earnest, reckless, pure, and honest girl in spite of being burdened with a rough destiny, and according to the author, Satella apparently lacks common sense, and the situation is so serious that her dictionary doesn't even have the word common sense. When she later appeared in the Castle of Dreams as Satella instead of the Witch of Envy, though she still proclaimed her love for Subaru repeatedly like the Witch does, her kind and gentle nature was shown when she displayed extreme concern and panic for him when he willingly bit off his own tongue to avoid listening to her, cried while questioning what it is he saw in his trials, and listened to him patiently as he spoke to the other Witches, unlike the aggressively envious Witch. She has trusted and requested Subaru to one day kill her.