Rui Arneb

Louis Arneb (ルイ・アルネブ) is a Sin Archbishop of the Witch Cult, representing the satiation aspect of gluttony.

Appearance
Louis has large blue eyes and extremely long blonde hair that can cover the floor like a golden sea. Her body is white as pottery and she wears rags unbefitting her beauty.

Personality
Subaru describes her as a girl that'd look good with a smile, yet he describes her "smile" as a smirk, and gave off the feeling that she made light of a lot of peoples' lives. She is also described to be evil intent in the shape of a child. Louis doesn't care much about what she eats, putting more emphasis on who she eats with. Also, the three speak in a collective manner using us and we instead of first or third person.

Being the youngest sibling, Louis initially​ gives off the impression of being respectful and loving towards her brothers, but later reveals that she found them idiotic for blindly eating lives for her just because she was unable to exit the Corridor of Memories. Louis believes that life is unfair and is like a conveyor belt, without having the ability to choose the family, environment and future to be born into. Advocating her actions and beliefs as a way to search for happiness, she mentions that she is making an effort to find the life that will satisfy her and let her live with her head held high, and currently believes that Subaru's​ life will provide her that fulfillment, as he is able to return by death, which will give her the ability to undo any mistakes she may make in future.

Abilities
Authority of Gluttony (暴食の権能 Bōshoku no Ken'nō): Louis is able to use the Authority of Gluttony. Birthing: Louis mentioned that there would be problems in Giving Birth when she had transformed Ley's body. This mention was cut out from the Light Novel.
 * Gluttony (暴食 Bōshoku)
 * Louis can eat the name and memories of their opponent. To eat a name, she touches them with her left hand, then licks the palm of the same hand. Things such as experience, talent, and the likes and dislikes of human relationships serve as food for her, allowing her to take advantage of any abilities or memories her opponents had. However, if she eats a fake name, she becomes plagued with severe nausea.
 * Those that have had their names eaten have their existences erased from the world, destroying any human relationships along with negating any contracts with Spirits.
 * Those that have their memories eaten become amnesic and any characteristics they may have had are reset, effectively making them into a different person.
 * Those that have both their name and memories eaten simply become a shell, and although they live, they no longer eat, excrete waste, or age, putting them in suspended animation.
 * Eclipse (蝕)
 * Eclipse is considered to be the trump card of gluttony. It is divided into two types; Solar Eclipse (日食 Nisshoku) and Lunar Eclipse (月食 Gesshoku).
 * Lunar Eclipse allows the holder to use the victims' memories and harvest their skills and knowledge. Ley, for example, used Lunar Eclipse to boost his physical strength and perform numerous martial art techniques including The Palm of the Fist King and the Leaper technique.
 * Solar Eclipse allows the holder to harvest his victims' name and transform their appearance accordingly. Louis, for example, transformed into Neiji Rockheart and numerous other victims she and her two brothers had eaten throughout the years, using her sibling's body. Both Ley and Roy dislike having Solar Eclipse used on them. According to them, Solar Eclipse made them feel as if their selves were being damaged, making it unendurable
 * This may refer to her ability to split herself into two.

Trivia

 * Louis's last name is also another name for the star Alpha Leporis, which is the brightest star in the Lepus constellation.
 * Louis does not think fondly of her brothers despite them bringing her food and to some degree caring for her.