Project Iron-Sun

during the second world war, japan had allied with the axis power, however, the german scientists that worked on the ubermanch project refused to share their findings, claiming the japanese "lack the knowledge to truly understand the ubergene", leading to the japanese to sign a secret treaty with the allies, using the military to create "project iron sun" in 1938-instead of altering genetics, they chose to focus instead on mechanical enhancements. led by jinrai metsubo, a renowned physicist and engineer, they utilized their many factories to mass produced the first widely successful mechanical enhancement: the daimaru- a mechanical set of arms that enhanced strength. japan mass produced superhuman soldiers for the war, and afterwards, japan continued the project, selling the tech to the US military in exchange for secrecy, knowing superhumans will play a key role in future wars. after discovering the project in 1975, the UN enacted the "anti mechanical, bio-mechanical and cybernetic enhancements and modifications law" banning all mechanical modifications , claiming them to be "unethical and overly destructive", and with that, project iron sun came to an end, and most enhancements were destroyed, the few that survived now command high prices on the black market, for both rarity and power.

Manufacturing

the manufacturing process was mainly done in factories all across japan, the enhancements themselves are divided into 4 generations, based on wich iron-sun mainframe was used:
list of known iron-sun enhancements:
generation 1 (1939-1952): rare, but not impossible to find (10000 of each made)
daimaru- mechanical piston arms, enhanced strength.
sennpu- a pair of small turbines and wings, flight.
kirifuda- arm mounted blaster, capable of producing a variety of bullets/ray, such as a flamethrower, a freezing ray, acid, regular and exploding bullets and electric arcs.
shikken- a sword with an electric current going trough the blade, causing the air around it to turn into plasma from the heat.
generation 2 (1957-1969):very rare to find, often expensive (about 1000 of each made)
barizun-brain controlled nano machines used for medicine.
kakuso- active camouflage suit, capable of hiding both visually and from infra-red.
hyakki- wheel mounted shoes with small jets on the back, provide enhanced speed.
tyranon- a collection of 3 drones capable of advanced surveillance, recon and information gathering, as well as small long range missiles, all connected to an implanted chip..
sandex- a rudimentary AI capable of hacking most security systems, as well as copy, replace, delete and alter various file formats, stored on a laptop.

generation 3 (1970-1975): (about 500 made) only sold at high price underground auctions:
raiden- an exoskeleton designed for rough terrain combat, equipped with a machine gun, multiple assault rifles, and a shikken.
tarakava- a 1 man all terrain vehicle designed to cover large stretches of difficult terrain, ranging from dessert to jungles to icy tundras and swamps, it is capable of traversing nearly any terrain.
uminao- a 1 man submersible capable of reaching 20,000 miles beneath the ocean surface, armed with torpedos and a harpoon gun.
generation 4 (1975): extremely rare (only 1 made of each, never fully completed).
sepharoth- a massive set of wings, jets and turbines, capable of achieving orbital flight.
gidorah-a mech designed to destroy cities, armed with missiles, giant arms, fully plated armor, and a tactical nuke.

Inventor(s)

jinrai metsubo, the lead scientist of project iron-sun, held a doctorate in both applied and theoretical physics, as well as engineering and robotics, described as a stern looking patriotic scientist

Access & Availability

at the time of production, only specially selected soldiers were authorised to use these enhancements, now, most are sold on the black market, with a few being on display at tokyo national museum

Complexity

most enhancements are made so anyone with basic understanding and training can use them, however, the enhancements themselves are very intricate, and require high-level knowledge in engineering, physics and robotics. all of the enhancements are built on the proprietary "iron-sun mainframe", a system used to connect the enhancement directly to the brain. the system had 4 versions, each working with a different generation of enhancements.