Satella

Satella (The Jealous Witch) is a major antagonist of Re: Zero - Starting Life in a Different World from Zero. She is the one responsible for summoning Subaru Natsuki to the parallel world and bestowing him with the Return by Death ability.

Appearance
Satella's true form bears a stark resemblance to Emilia (as noted by Subaru) - She has a slender body, long silver hair with violet colored eyes, along with elven ears. Initially Satella appeared as a shadowy figure, which was created out of Subaru's reluctance to accept her, however he later accepts her and is able to see her face.

Personality
Despite popular belief, Satella and the Witch of Envy share two distinct personalities: Satella is reasonable and caring, whereas The Witch of Envy is more aggressive about things.

Despite the two personalities often clashing, they both share the same feelings for Subaru.

Background
400 years ago, Satella had absorbed the Envy Witch Genes, which she wasn't compatible with and subsequently went out of control and swallowed half of the world (while killing the other six witches in the process). Unable to be killed, Satella was eventually sealed away by the combined might of many warriors, including a Sword Saint, Dragon, and Sage, Satella currently resides in a shrine near the Great Waterfall, in which she is watched over.

Trivia

 * It's currently unknown as to how and why Satella/The Witch of Envy love Subaru Natsuki. Because of this, it is one of the biggest topic by fans of the series.
 * Although she does mention that Subaru was the one responsible for "giving her light in the darkest of times".
 * Unlike the other Witches of Sin that will centuries later have a Sin Archbishop, The Witch of Envy does not have someone that represents the Sin of Envy.