Rui Arneb

Louis Arneb (ルイ・アルネブ) is a Sin Archbishop of the Witch Cult, representing the satiation aspect of gluttony. She's later revealed to be the actual Sin Archbishop 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. Unlike Ley and Roy, 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.

Abilities
Authority of Gluttony (暴食の権能 Bōshoku no Ken'nō): Louis is able to use the Authority of Gluttony.
 * Gluttony (暴食 Bōshoku)
 * Louis can eat the name and memories of their opponent. To eat a name, he touches them with his 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 him, allowing him to take advantage of any abilities or memories his opponents had. However, if he eats a fake name, he 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 preventing the use of magic and 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 and is also confirmed to have two types; Solar Eclipse (日食 Nisshoku) and Lunar Eclipse (月食 Gesshoku). The power of both haven't been explained but upon using Lunar Eclipse, the madness and resentment around Ley deepened, which Otto described as becoming sinister on a different level, and his speed increased enough to make others feel as though he had moved in an instant. Louis, while speaking through Ley's body, claimed she couldn't use it properly in his current body but added that she could still completely destroy her opponents.
 * Master Class Fighter: Through accumulation of souls eaten, Louis gains any abilities her victims once had such as martial art techniques and magics except for Spirit Arts and Divine Protections. In turn this has granted her extraordinary combat strength.

Birthing: Louis is stated to have "birthed" Ley and Roy and adds that too much exhaustion would cause problems during the process. She is also able to talk through them, as shown when she talked through Ley to Subaru and the others during the battle at Priestella, with Ley himself fully aware of this, replying to what she said.

Trivia

 * Louis's last name is also another name for the star Alpha Leporis, which is the brightest star in the Lepus constellation.