|Name in Japanese||にんぎょ|
|Codename/s||Mad Cooker (LK)|
|» Media Appearances|
|Debut (Light Novel)||Volume 8|
|» Technical Specifications|
|Classification||Long-range Naval Invasion Weapon|
|Type||1st Generation specialized in naval battles|
Ningyo (にんぎょ) is the Japanese word for a mermaid or merman.
The Ningyo is an Object made by the Island Nation. Due to the Island Nation's mentality of improving old weapons instead of creating new ones, its insides have been completely swapped out so it can keep up with modern models despite being officially classified as a first generation Object.
The Ningyo is armed with a salt railgun, a weapon that was mainstream before low-temperature superconductors were successfully used in weapons. It uses a liquid known as molten salt. When salt is heated to 1200 degrees and liquefied, it has ten times the conductivity of normal saltwater. That molten salt can be used to construct a cheap and primitive railgun.
The current version gives the shells conductivity by creating them from a base of over 90% salt. The core of the shell is a long, narrow spike of tungsten called the Ushi-no-Koku (うしのこく). It’s made so the mass of salt shatters when it’s fired. That sends all the kinetic energy into the tungsten so it can pierce the enemy’s onion armor. As long as they had the technology to filter out and condense the iron and rare metals dissolved in the ocean, it was conceivable that the Object could fight indefinitely with no need to resupply.
- Class: Long-range Naval Invasion Weapon 
- Type: 1st Generation specialized in naval battles 
- Length: 75m 
- Armor Material: 5cm x 200 layers (including welding impurities)
- Propulsion Engine: Electrostatic propulsion + naval floats 
- Top Speed: 580km/h 
- Main Armament: Salt railgun x 1 
- Secondary Armament: Laser beams, low-stability plasma cannons, etc 
- Main Ring Color: White 
The Ningyo was the Object acquired by the self-defense PMC during the civil war and used to protect their base, the Ame-no-Darin. A three-way battle began between the Ningyo, the Yuuhi and the Baby Magnum. The Yuuhi and Baby Magnum destroyed the Ningyo with a combined attack after its Elite interrupted a discussion between the other two Elites.
- The Ningyo's codename is misspelled in English in its profile image in Volume 8, 'Mad Cocker' instead of 'Mad Cooker'.
- ↑ Heavy Object: Dominion 70% Chapter 1 Part 19
- ↑ 2.0 2.1 Heavy Object: Dominion 70% Chapter 1 Part 7
- ↑ 3.0 3.1 3.2 3.3 3.4 3.5 3.6 3.7 Heavy Object: Dominion 70% Pg.52, Object Profile
- ↑ Heavy Object: Dominion 70% Chapter 1 Part 4
- ↑ Heavy Object: Dominion 70% Chapter 1 Part 15
- ↑ Heavy Object: Dominion 70% Chapter 1, Object Profile