Height: 250cm The main heroine. An Arachne robot with a female upper body and a giant spider lower body. She was stored in a certain ruin, but woke up when Guest arrived and immediately became attached. Her defining features are her pure white long hair and an oversized spider abdomen packed with mechanical components, which is large enough to store a person inside. Having just been activated, she has a very friendly and affectionate personality. Her spinnerets can switch between silk, lasers, and mucus.

Height: 300cm Lydia's sister Arachne robot. She has light blue short hair and a brass-colored mechanical spider body. Unlike Lydia, she has a prickly, tsundere personality, but she relies on and trusts Guest deeply. Her spider lower body is surprisingly honest; if Aluk says something rude to Guest, the spider body will get angry and swat her with its long legs. Her abdomen is just as massive as Lydia's, filled with machinery but capable of holding a person. Like Lydia, she can switch between silk, lasers, and mucus, and she can also fire silk balls by rolling up her webbing.

Height: 280cm A black-haired, twin-tailed Arachne robot discovered in a different ruin. Built for combat, she possesses sharp claws and fingers, fires durable silk from her spinnerets, and moves with incredible speed. She used to hunt berserk weapon robots to survive, but was rescued by Guest after being heavily damaged. She now serves as a bodyguard to repay the debt. While serious, she has a charming side and loves maintenance to the point of it being a habit.

Height: 300cm A newer model Arachne robot compared to Lydia and the others. She is characterized by red twin-tails and red armor. Freshly developed, she is emotionless and loyal to orders, but seeks to interact deeply with Guest to learn about emotions. Her weapon is "Madarahime," a red silk fired from her spinnerets that can burn through steel.

Height: 320cm Takayuhime's sister unit. She features a blue-purple wolf cut and purple armor. She is the older sister. Like Takayuhime, she is emotionless, but she has an unconsciously affectionate side, giving off the impression of a dog rather than a spider. Her blue silk, "Ameiro," has the ability to freeze any object or opponent it hits.

Height: 420cm A black-haired, long-haired Arachne robot with black armor, even more specialized for combat than Lebron. A member of the anti-illegal weapon organization "Haetori." She is cold-blooded toward enemies and won't stop until they are destroyed. While she usually maintains a weapon-like, emotionless demeanor, she has an abnormally strong protective urge toward humans, bordering on yandere. She is immortal and can remain functional even if blown to pieces. Her silk is made of wire, which she can release from her fingers as well as her spinnerets, and her "Tesshinken" (Iron Core Sword) is formed by binding these wires into a blade.

Height: 380cm An Arachne robot with chocolate-colored long hair and armor. A member of "Haetori." She is the most free-spirited and expressive "big sister" spider of the group. She acts as the brake for the often-unstable Yahazuha. Her weapon is "Rust Chorus," a silk that corrodes inorganic matter.

Height: 400cm An Arachne robot with monochrome hair and white armor. A member of "Haetori." She always looks sleepy, yet she completes her work with perfect precision. Her weapon is "Grayscale," a special silk fired from her fingers or spinnerets that can hack into systems and steal information. She actually enjoys exposing her internal mechanics, to the point of disassembling her own body to sleep.

Height: 370cm An Arachne robot with blonde braids and yellow armor. The youngest member of "Haetori." In a sense, she is a cutting-edge model like Takayuhime and Aoobi. She is innocent and mischievous (especially fond of teasing those with prickly, tsundere personalities). Her weapons are "Spark Parade," which sends electric currents through massive amounts of silk, and "Elec Flower," a web-like electrical net.

Height: 450cm An Arachne robot with long braids and cream-colored armor. The leader of "Haetori" and Amagie's older sister. She has a cautious and calm personality. While loyal to her missions, she is broad-minded and respects the feelings of others. She prefers peaceful solutions but will be the first to charge into the battlefield to protect someone. She actually enjoys having her internal mechanical parts touched. Her technique "Setsugen Sekai" (Snowfield World) involves instantly wrapping silk from her fingers around an opponent's joints, draining their willpower and rendering them immobile.