S.T.E.P

Self Transformative Electrostimulation Patch (S.T.E.P) is an electrostimulation technology developed by George Miller as a passion project. The device itself intends to give muscular control to those with motor deficiencies without the means of surgery. The project never reached full commercial production and all remnants of it were attempted to be destroyed in 2005. The technology was revived in the final book of the series to revive Mitsuru's motor function

Hardware
S.T.E.P is a full sized, skin tight body suit that contains probes on the inside of the suit. Compared to typical Functional Electrical Stimulation (FES), which typically uses only upwards of a few hundred probes, S.T.E.P utilizes 44,256 probes to control a wide range of motor movement in the body. All the probes connect to the processing pack that is worn around the waist. The processing pack connects to the BONNET that is worn atop of the head. The BONNET contains a prong that lays near the location of the cerebellum.

Software
What differentiates S.T.E.P from typical FES devices is its ability to read and decode neural oscillation for motor coordination of the suit. The suit reads brain waves interpreted from the BONNET and sends a recreation of the signal through a fiber optic connection to the processing unit. The processor decodes said brain waves into a machine-readable instruction sequence.

The system, however, must be configured on a case by case basis. First and foremost, the system's most recent iteration must run in one of three configurations, Alpha (α), Beta (β), or Omega (ω). Alpha configuration targets motor coordination of the upper body and beta targets the lower body. Omega intends to control the entire body, at the cost of a higher input delay. Additionally, the primitive outdated SDK must be used to configure the system to read an individual's brainwaves.

S.T.E.P is also without its constraints. The battery of the prototype uses large capacitors to provide enough electricity for stimulation. These capacitors consume a large amount of electricity and hinder the system's battery life. In α or β, the system can run upwards of 10 hours on a single charge, while ω can only run on 5 hours. ω is also notoriously unstable. Irregular read errors can lead to involuntary movement and even permanent neural damage. These ideas are explored fully in Jikken-Shitsu Kara Akuma when George tests his device.

History
An early prototype was developed by George Miller in 2002 right when Super Smash Bros Melee was gaining popularity. It was initially intended as a method to push the limits of human motor function to perform advanced techniques in Melee. George Miller scrapped the idea and instead decided to use it to aid people with paralysis, most notably his friend Ian. In 2004, George had begun tests with a functioning prototype. He had caught the attention of Takeharu Kirijo, who intended on buying George's idea and selling it to the Chinese military. George destroyed all remnants of his project and hid the evidence from Takeharu.

In 2020, two heavily damage S.T.E.P prototypes were found in a Himilayan landfill. Towards the end of 2020, a total of 6 prototypes were confirmed to exist with varying conditions. The suit in the best condition was taken by Squidee and subsequently was used to restore the motor movement of Mitsuru Kirijo.

Trivia

 * The concept of S.T.E.P bears a similarities to the STEM system in 2018 film Upgrade, albeit with the user having complete control over their body.