Lambda

Lambda (ラムダ) (Λάμβδα) is a named Number member of Shadow Garden, in charge of training new members. She is also one of the earliest recruits in the organization after the Seven Shadows began their expansion after the Rescue of Claire Kagenō.

Appearance
Lambda is a Dark Elf with gray hair, sharp golden eyes, beautifully plump lips, with a tall stature and refined muscles from years of military training. She wears a Slime Bodysuit molded into a military uniform, accompanied by an officer's cap and jacket draped on her shoulders, the style of which she is accustomed to having served in the Velgalta Empire's military. At times, she'll have one eye open and routinely analyzes whomever crosses her vision, such as Rose Orianna when she joined Shadow Garden.

Personality
Being that she was formerly a military officer in the Velgalta Empire, Lambda is a strict instructor and harsh towards trainees, given her background and to ensure they're up to whatever tasks soon follow. Such as Rose Orianna, 665, and 664. Whenever someone joins Shadow Garden's ranks, Lambda will not inquire into their past, as all numbers are just that, with who they were originally being knowledge privy to the executive officers, like Alpha, Beta, Gamma, and Epsilon.

Background
Lambda was once part of the military of Velgalta Empire, but after becoming "possessed", she was captured by the cult and was taken to a hidden facility. While a Cult prisoner, the Seven Shadows attacked the facility and found her, the only surviving captive, and Epsilon healed Lambda to restore her to her true form. Following this rescue and the revelation of the truth of the Cult of Diablos, Lambda joined Shadow Garden and earned her rank as the Named Number Lambda, or Number 11.

God of War Festival
After the God of War Festival, Alpha brought Rose Oriana to the secret city of Alexandria, the hidden headquarters of Shadow Garden. Ignorant to her true identity, Lambda carried out Alpha's orders to train Rose and renamed her to Number 666, and assigned her to partner with 664 and 665 as a new team. Lambda then carried out her instructing No. 666 as she did with all other members in Shadow Garden.

Powers & Abilities
Like the other Named Numbers in Shadow Garden, Lambda is a master fighter, incorporating her military experience with her training under the Seven Shadows. As such, Lambda oversees training the subordinate Numbers in Alexandria, ensuring they have the training and skills to survive their missions investigating the Cult.

Trivia

 * Both the appearances and interactions of Lambda, Omega, and Kai are constructs made for the anime, as none of them have made an official debut in the novel/manga.
 * Lambda's first animated debut was in the game before she debuted in the anime by the season finale, Episode 20.
 * Lambda is the second Named Number in Shadow Garden to be a Dark Elf, the first being Omega.