Sirin

> "***But they—the Sirins—are dead. They're merely imitating humanity, technically without personalities of their own. The Sirins are mass-produced, and they're replaceable.***"
> ― Viktor Idinarohk to Vladilena Milizé.
>
>

## Personnel

### Personnel

* Lerche
* Ludmila
* Darya
* Vera
* Yanina

## Mechanical Units

Alkonost

A **Sirin** (シリン,, *Shirin*?), dubbed the **Artificial Fairy** (人造妖精,, *Jinzou Yousei*?), is a pseudo-artificial intelligent being developed by Viktor Idinarohk. The Sirins are used to supplement the manpower of the United Kingdom Armed Forces in the war against the Legion.

## Creation

Once a soldier that has volunteered to donate perishes on the battlefield, their digitized brain structure would be reproduced via artificial cells. Their memory is then wiped and a pseudo-personality is installed, before transplanting the cells into a mechanical body visually identical to that of a human. Due to them being a product of the dead, Shinei Nouzen can hear their cries of wishing to pass on to the afterlife.

## Description

No matter the sex or gender of the donor, the Sirins are all feminine in their personality and appearance. As a majority of the United Kingdom's military personnel were men during the revelation of the Sirins, they were created as women with unusual hair colors to differentiate between them. In hindsight, those unusual hair colors were also useful in differentiating between the Sirins and the female soldiers who enlisted or were commissioned later in the war.

When not partaking in an operation or training, they are typically turned off and stored in a unique hangar. The master data for their brain structure is stored in the production plant, and their combat records are regularly backed up, allowing for them to be replaced when destroyed.

Sirins do not need to eat or rest, and their senses of taste, smell, touch and pain are nonexistent. Their sight and hearing are no different from the sensors on a Feldreẞ. They have an artificial circulatory system with bright blue fluid, as well as a cooling system in their chest.  But in order to keep their physical sizes down to that of a normal human, Sirins are not physically strong and have fairly limited battery life.

It is possible to resonate with Sirins using the Para-RAID, but the people who do so would feel a coldness that wasn't there for a normal human being.

The Sirins also all posses certain uncanny characteristics that remind one that those are machines and not humans, for example, they do not need to breathe and thus exhibit no related movements, their movements typically carry a brief lag with them, their eyes that don't focus properly, and their tones of voice come off as unnatural. Theoto Rikka described them as less like humans and more like Self-Propelled Mines that are better made and capable of intelligent speech.

## Background

The Sirins were developed after the Mariana Model AI based on Vika's mother. Much like his previous artificial intelligence, the Sirins were created in order to preserve the life of someone close to him that he had lost. The first ever produced Sirin—Lerche—was based on a girl named Lerchenlied, Vika's milk sister. She had died when accompanying Vika to his first battlefield. Unlike the other Sirins, she never had to undergo memory deletion, as her memories were not present even during the brain scan.

The memory deletion procedure became necessary during the creation of future Sirins, as the brain structure would simply collapse and never start up. Once Vika had perfected their method of creation, the Sirins were mass-produced for the purpose of combating the Legion. The Sirins were deployed on the battlefield with the semiautonomous Alkonost, soon becoming the bulk of the United Kingdom's Armored Forces.

## Tactics

The Sirins, with the sole exception of Lerche, are able to be backed up and redeployed onto the battlefield even after their mechanical bodies are destroyed, making them an expendable force. The Sirins are reckless in their way of fighting, much like the Eighty-Six. The Alkonosts which they pilot are not built with their safety in mind, and commanders can order them to execute commands that would be considered inhumane to a normal soldier.

The Sirins are accompanied by Handlers carried inside a Barushka Matushka. They act as their tactical commanders and battlefield supporters. Some of the Handlers cherish their Sirins dearly, going so far as to curse the members of the Eighty-Sixth Strike Package when the Sirins had to be sacrificed for their sake.

## Trivia

* The word "Sirin" is inspired by Russian myths, where a Sirin is a half-woman, half-bird monster.
* In the aftermath of the Large-Scale Offensive, Zafar Idinarohk mentioned that their "drones" which observed the Morpho could only carry "payloads that a fair maiden might carry". He meant that in a literal sense, as those drones were Sirins.

## Gallery

Shin hears the voice of the dead within Lerche, a Sirin.Lerche laments to Shin regarding the differences between the Sirin and the living.The Revich siege route created by the wreckage of the Sirins and their Alkonosts.Ludmila questions Rito as she sacrifices her current iteration.
## References

1. ↑ 1.0 1.1 Volume 5 Chapter 1
2. ↑ 2.0 2.1 2.2 2.3 2.4 Volume 5 Chapter 2
3. ↑ Volume 5 Epilogue
4. ↑ 4.0 4.1 Volume 5 Chapter 4
5. ↑ Volume 5 Chapter 3