Echidna

Echidna (エキドナ) is the Witch of Greed. After the Sanctuary was released, she transferred her soul into Lewes Meyer and renamed herself as Omega.

Appearance
Echidna is described to give others a white impression, with long snow white hair and beautiful skin. Only her intellectual looking eyes and dress are black, the two colors drawing out her beauty, and she is mentioned to be beautiful enough that anyone would be fascinated by her.

Personality
Echidna's curiosity toward the unknown and her thirst for knowledge are the two things that define her behavior. She refers to it as love, and currently directs those feelings toward Subaru, who she has taken a massive interest in due to his Returns by Death ability, to the point that she longs to become his advisor to record the many possibilities created from his ability.

Described as being black hearted, she cannot understand the feelings of others, and can be seen as a psychopath by normal standards. If it is to get ahold of more knowledge, she has no problems with employing sophistry, lying, and deceiving others. However, she interacts with ill will only toward three people in the world: Satella, Emilia, and one other person.

History
A long time ago, Echidna worried about everything, think of them as children that needed to be protected. She thought it was easy to control a world where things broke apart with the swing of a hand, however she decided to put her efforts into protecting things instead. Despite this, no matter what she tried, she was unable to do anything by herself, making her experience how powerless she was. Although she despaired, she didn't give up, knowing that she could reach her goal if she had more people with common interests. From that point, she kept of persevering, no matter how much she lost or was hurt, all to reach her goal.

Abilities
Authority of Greed (強欲の権能 Gōyoku no Ken'nō): Echidna is able to use the Authority of Greed.

Trivia

 * According to the author, Echidna's birthday is January 24.
 * Echidna's name refers to 42355 Typhon I Echidna, 42355 Typhon's moon and a companion to a binary asteroid. In Greek mythology, Echidna is a monster who was the mate of Typhon.