Serial Designation "D" (Doll)

Doll had long dark indigo hair with blunt bangs and neon red eyes. She wore a black pilot hat with a green army dress. her usage of the Absolute Solver ended up breaking her right eye beyond repair.

Doll is an interpretation of the Quiet One trope — introverted and taciturn.

Doll rarely spoke to anyone, talking occasionally with her friend Lizzy and giving enigmatic non-answers to questions anyone might have. In addition to being quiet, Doll lacked any interest in expressing herself to others under the assumption that no one understands how to help her. When first confronted by Uzi, Uzi tries to talk her into moving on, responding to Uzi's attempt at persuading her by saying she doesn't need help, implying she doesn't choose to listen to anyone.

Beneath her façade of an introvert who prefers to keep to herself are deep psychological problems resulting from seeing her parents killed and eaten at a young age (assumed) by Serial Designation V. This aftermath resulted in Doll becoming hellbent on killing V as revenge for the deaths of her family as she does anything to achieve her goal, even resorting to murdering some of her fellow Worker Drones. Furthermore, Doll has shown herself to be both determined and deadly, but she has also proven to possess keen perception and quick thinking in challenging circumstances.

Despite being undeniably persistent and murderous, Doll has shown to have a grasp of some morals and sympathy for others. For example, she cares about her fellow Worker Drones, particularly her friendships with Lizzy and Thad. Regardless of the fact she doesn't like to express herself, she can relate to anyone who has faced similar situations akin to hers, particularly with Uzi. Although Doll once laughed at the fact that Uzi had survived an explosion caused by her railgun, Doll can relate to Uzi's situation and offers to help Uzi through her struggles. After she is given the Keybug from Uzi, Doll tells Khan on her way out that he "raised a good daughter". Doll can also be helpful to some extent as when her body shuts down due to her injuries caused by Cyn, her last words to Uzi are to "fight back" in Russian.

Disassembly Drones are physically similar to Worker Drones, having a white coloration with a black screen on the top half of their face, a black waist, and hands with four fingers. However, Disassembly Drones are half a head taller than them and have white arms with wider forearms that end with yellow and black stripes. On their head is a black headband with five round yellow lights which contains Nanite Acid. In their mouth is a dark gray tongue and retractable fangs. All Disassembly Drones also sport a long black tail that ends in a large syringe, also containing the acid.

Males have feet that end on yellow and black stripes, giving the appearance of soles/heels, while the females' shins are tapered to a point. Females also have curvy torsos and black markings on their legs, giving the appearance of stockings. The markings also come with yellow and black hazard stripes. Unlike Worker Drones, Disassembly Drones have hair regardless of their gender. Their hair is silver while their eyes are neon yellow, akin to that of Cyn's, and they wear black short-sleeved clothes and a yellow armband on their left upper arm.

Telekinesis Due to her Absolute Solver abilities, she can move things without directly touching them, from books to knives to large tables using minimal effort. She was also shown using her telekinesis to conjure a shield that deflected V's bullets, as well as making a surveillance camera face the other way. Another example is when Doll lifts a whole boulder and threw it in Cyn's direction in an attempt to stop her from attacking her.
Glass Shattering Every reflective surface Doll looks at gets shattered.
Illusion Creation Doll, when using her powers, seems to conjure red lines of code. It is unknown if this is controllable or not. Doll was also shown to use illusions to replay memories.
Matter Replication As seen in the 3rd episode during the fight between Doll, Uzi, and N, Doll was shown to be able to replicate several knives from only one.
Matter Synthesis/Reconstruction In the opening scene of the 3rd episode, Doll was shown to synthesize a butcher's knife while murdering Kelsey Day. She is later shown doing the same with other blades.
Matter Transformation When she attempts to kill V, Doll enlarges and sharpens a set of fan blades to make them deadlier.
Object Acceleration Doll was shown seemingly speeding up a simple ceiling fan to dangerous velocities in her fight against Uzi and N.
Regeneration Doll is shown to regenerate her cracked visor after being shot by V in the back of the head.
Teleportation Doll is seen teleporting across many locations, like when she teleported back to her home after being seemingly shot dead by V.
Lock Manipulation Doll can force doors to become locked.
Spark Generation (?) In her first appearance in The Promening, red lines of sparks can be seen appearing near her for a brief moment, presumably in response to her using her Absolute Solver abilities.

Overheating/Vampirism Similar to the Disassembly Drones, Doll has an insatiable craving for oil and (presumably) overheats and dies if she does not consume enough of it.
Interact Inability Doll cannot use her Absolute Solver abilities to interact with other Solver hosts like Uzi and Cyn. When she attempts to do so, an error message (written in Russian) will display on her visor, stating that the host is a "like object" and is "non-interactive."
Gradual Decay From episode 5 and onwards, Doll is shown wearing a button-style eyepatch to cover the right side of her visor. Later, in episode 7 when she confronts Tessa, it is revealed that that part of her face is in a state of permanent decay impairing her sight.

Flight Disassembly Drones possess a dangerous pair of large retractable wings with several long blades in the shape of feathers that allow for high-speed flight and can be used to cut and impale things. They don't need to move their wings to fly either; numerous times throughout the first episode, Disassembly Drones are seen floating with their wings unmoving. It is unknown how this works.
Nanite Acid The end of a Disassembly Drone's tail has a syringe of yellow liquid containing highly corrosive nanite acid. This acid can only be neutralized by the saliva of Disassembly Drones.
Extreme Agility and Strength Disassembly Drones are shown to be very strong, like how N effortlessly crushed a Worker Drone head and threw Uzi across a long distance. Also, his landing was powerful enough to crack the ground and knock Uzi off her feet.
Virus Implant Disassembly Drones can implant a chip containing wdOS_606 onto another of their kind if they ever become "corrupted."
Healing Saliva A Disassembly Drone's saliva can neutralize the corrosive Nanite Acid in case they accidentally sting themselves. This saliva works on Worker Drones as well.
Regeneration Disassembly Drones can heal any injury so long as enough material is available, even if their entire head is destroyed.
Interchangeable Hands Disassembly Drones can switch out their hands for various tools and weaponry such as:
Claws
Blades
Chainsaws
Submachine guns (Design similar to the HK MP5)
EMP generators
Missile launchers
Laser cannons
Virus chip planter (J only)
A circular saw, surgical scalpel, and a gloved human hand (Used by Beau during Dead End)
A flag that reads "LITERALLY SO INSANELY SUSPICIOUS" (V only)
Other miscellaneous attachments (V's bubble wand)
A screwdriver for likely repairing machinery (concept art)
The limits of this ability are currently unknown.

During GlitchX, Liam Vickers stated that they can create whatever weapons and tools the plot needs.

Vampirism Disassembly Drones have an under-par cooling system as a result of solver tampering, and thus overheat from heat sources such as sunlight. To keep themselves from overheating, they must consume Worker Drone oil regularly or they will overheat, cease to function, and die.
Corrosive Nanite Acid Despite their tails being loaded with corrosive nanites, Disassembly Drones themselves aren't immune to their acidic effect, thus requiring them to have nanite-neutralizing saliva to counter it.
Durability Limit Disassembly Drones have a limit to their durability; a pen could pierce through their facial screens. If the damage is severe enough, they are also unable to regenerate, as when Uzi's railgun obliterated J's upper half. In case of death, Cyn will activate the Absolute Solver to gather the necessary material to reconstruct their host.
Manipulation Since Disassembly Drones possess sentience and unique personalities, they can be manipulated, tricked, or even disgusted, distracting them from fighting an enemy.
Tail Tangling As they possess long tails, Disassembly Drones can get tangled in or tied up with their tail.
Infection Disassembly Drones can be infected with wdOS_606, a core termination program, from another Disassembly Drone via a hexagonal chip. N was infected by J when he tried to sympathize with his prey and questioned the company and his directive. Infected drones will be immobilized and have stuttered speech. Furthermore, their visors will display constant error messages. Once the virus upload reaches 100%, the Disassembly Drone will die unless someone removes the chip in time.
Magnets As shown by Alice in "Dead End", all drones, Disassembly included, can be 'sedated' by attaching magnets to their head. This presumably makes them largely immobile.
Boot-loop Light All drones, including Disassembly Drones, can be boot-looped by the Sentinels. It renders the drone unresponsive and immobile.

Absolute Possession The Absolute Solver's most noteworthy ability is the complete possession of a host. The Solver has full control over the body of its hosts and can use its powers to a greater extent. An example would be Cyn, the Solver's first known host.
Matter Manipulation The Absolute Solver is able to manipulate matter at the atomic level. This can be done to create new objects out of old matter (See Regeneration), or convert dead organic matter into living matter. In Cabin Fever, Uzi was shown to transform an arrow shot at her into a deformed mass of still-living flesh, and both Cyn and Uzi have been seen creating organic body parts that they grafted onto their bodies, including wings, tails, tentacles and claws of varying sizes.
Telekinesis Demonstrated with users like Doll and vessels such as Cyn, Nori, and Uzi, the Solver can be used to interact with matter without making physical contact. This includes translating objects in any direction or rotating objects around a point. The Solver can exert a large amount of force this way, enough to crumple a thick metal door almost instantly.
Teleportation While being used, the Absolute Solver's known hosts are shown to be able to teleport, leaving behind yellow afterimages as it does.
Illusion Creation Whenever using its powers, the Absolute Solver can conjure lines of code, which vary in color depending on the host. It is unknown if this is controllable or not.
Shapeshifting While in control of one, the Absolute Solver can alter the appearance of their host. For example, V, during her time at the Elliott Manor, had her right hand replaced with a set of claws; she also sprouted wings. Meanwhile, Uzi grew a tail and similar wings during her rampage in episode 4.
NULL Creation The Solver can create NULLs, which look like miniature black holes capable of expanding and stretching. The black holes could annihilate any matter they touched and travel at high velocity when thrown.

Hand Amputation Hosts of the Absolute Solver need their hands to use its power. In Mass Destruction, while Uzi was under the control of the Solver, Nori and N cut off Uzi's hands to temporarily prevent her from using her abilities.
Decreased Dexterity with Claws During the scene in Home where the Absolute Solver was attempting to perform a lobotomy on N, it appeared unable to pick up a scalpel with one of its tarsal claw-like arms.
UV Light While Nori was under the control of the Solver, UV rays caused her mechanical claws to burn up and become visible. Similarly, back at the gala, Cyn's mechanical claws were revealed when the light from the lightning behind her exposed them. Finally, in Absolute End, Uzi blew a hole through Copper 9, disintegrating Cyn's heart by allowing sunlight to shine through from the other end of the planet to reach her.
Overheating/Vampirism In some scenes where the Absolute Solver is used by a host, it sometimes shows a high-temperature warning. It also has a reliance on oil to maintain a cool enough temperature to consistently use the Absolute Solver's powers. In addition, this makes hosts of the Solver extremely sensitive to sunlight, such as Uzi's hand burning up when it makes contact with the rising sunlight at the end of Cabin Fever.