665

No. 665 is a member of the Shadow Garden, being one of the Numbers. She is part of a three-person squad consisting of herself, No. 664, and No. 666. After No. 666 becomes queen of the Oriana Kingdom, 665 becomes one of her maids alongside 664.

Appearance
665 is a beautiful young female Elf with waist-length white hair and blue eyes. She is depicted as being tall with a curvy body that have sizable bust to contrast her from her partner, 664. As a member of Shadow Garden, 665 wears a dark Slime Bodysuit with gold accents which is a standard uniform for a Numbers agent, but with a bustier compliment to showcase her bust while allowing unrestricted movement. After forming a team with 664 and Rose Oriana, 665 added shoulder pads with a mini-cape attached, which covered her upper back, and her bustier now exposes the top half of her breasts.

Personality
"Mooornin’, 666."

- 665 to 666

Compared to the overly diligent 664, 665 is noticeably more laid-back. However, she does follow her orders obediently and cares for her comrades. Overall, between the more extreme 664 and 666, 665 often serves as the voice of reason within their squad.

In the anime, she also appears to be a glutton, often appearing with food in her mouth.

Red Moon Incident
665 participated in the assault on the red tower in the Lawless City alongside 664 and 666, under the command of Beta. Their mission was to gather information in researching a sample of the Vampires Progenitor blood with the Demon Possession and help their lord Shadow if necessary.

When the vampire queen Elisabeth was resurrected, they immediately attended to help their lord's sister, Claire Kagenō, who was seriously injured and drained of blood by Elisabeth. 664, 665, 666 and Beta faced the vampire queen while protecting Claire, all as they were buying time until Shadow came to their aid.

Then the girls cooperated with the two rulers of the other towers, Yukime of the White Tower and Juggernaut of the Black Tower. Along with the guidance of Mary, the ancient vampire slayer, they all stood up to Elizabeth, but they were inevitably all seriously injured by her. However, Claire stood up and confronted Elizabeth while holding her back, until 665 and her team saw Shadow appear to face the vampire queen. At the end, Shadow attacks her with his opposite ultimate attack, "I Am Recovery Atomic", which heals everyone equally and destroys the red tower.

Great Trading Company Conflict
During the secret internal dispute between the Mitsugoshi Company and the Great Commerce Alliance, when another faction was detected involved in the plot to cause the collapse of banknote credits, 665 was dispatched by Alpha and Gamma alongside 664 and 666. They were to find out the places of distribution and transportation of gold through secret caravans, but when they were about to find out the ringleaders, they were confronted by a man named John Smith, who immediately ordered them to turn back. The team refused and pressed an attack, but they were defeated and immobilized by John Smith by his magical steel threads. They then withdrew due to John's warning, returning to Headquarters to inform Alpha and Gamma about their failure and an incident report.

Oriana's "Black Rose" Civil War Wedding Incident
During the civil war of the Oriana Kingdom, 665 along with 664 and 666, were called by 559 to the Oriana Kingdom for an infiltration mission to see and investigate some ancient ruins at the Saisho Stronghold that the Cult of Diablos was investigating. While they remained hidden, Queen Reina Oriana, Rose's mother, was among the cult group, to which 559 found irrelevant and prepared to strike down the queen with the 40 First Children of Diabolos. But 666 intervened to save her mother, resulting in 559 branding her a traitor and prepared to kill the cultists without caring about 666's situation. With 664 and 665 forced to attend to 559, the two were injured as 559 remained and continued fighting until only one cult lieutenant, Kouadoi, remained. While unconscious, their lord, Shadow, came to their rescue.

Shortly after recovering, 665 went out to explore the situation in the capital and came to report to Shadow, as he was in discussion with 559 and 664, about what 666 did. When she reports that Rose was announced to be going to marry with Duke Perv Asshat, Shadow was enraged to the point of exclaiming that Rose Oriana would not be forgiven. 665 was, and still is, unaware that Shadow was unaware that Rose and 666 are the same person.

When the "Black Rose" was activated and hundreds of Magical Beasts appeared, 665 and 664 set out to help 666/Rose in their battle against the invading beasts. Despite everything, they wanted Rose to be their friend, not only as their partner.

The Academy Disappearances
TBA

Swordsmanship
665 after being saved from her demonic possession and being entered by the Shadow Garden, she has a skill and management of fencing that good that combined with her magic, she can face it and resist a fight against "First Children" of the Cult of Diablos.

Medical Knowledge
665 at least knowledgeable enough to know Claire's injuries are severe that need medical attention.

Magic
TBA

664
She has sympathy and trust with 664, although they have opposite behaviors since more than once 664 scolds her for her sleepy and semi-distracted, and cheerful way of working. When they communicated their failure in the mission to Alpha, 664 began to argue with the 666. But Alpha orders them to leave quietly and 665 takes them by force.

In the anime, 665 and 664 have a comedic routine where the latter has to keep the former's focus away from eating all the time.

Rose Oriana
She has an optimistic and cheerful affection for Rose. Even when she saw her make a disobedient decision before her teammates, 559 and 664, 665 still supported her with joy and everything.

Shadow / John Smith
She has a respect, loyalty, and some form of admiration for her lord, Shadow, for the way he makes his skills look so beautiful. As she is not a Named Number, she is not privy to her master's secret identity.

When 665 faced John Smith without knowing that it was Shadow, she was amazed by the beautiful way in which he moved the magical steel threads that she almost did not pay attention that they were enemies.

Alpha
665 has a well-earned and dedicated respect for Alpha. When 664 and 666 started fighting in front of her, Alpha told them to leave and 665 complied by forcing her two companions to leave with her.

Trivia

 * No. 665 was originally introduced as a Beastkin. and was later written as an Elf.