This is something that I started working on earlier last year but never had the opportunity to finish it until now. There’s some pretty interesting information here, so I hope you enjoy!

A couple interesting things to note:

• The Commander was against the M Squad project but was overruled by the Council of Humanity.
• No2’s battle data was used in the development of future No2 models, which were rebranded as Type E units.
• The “false memories” installed into prototype YoRHa models was later abolished since they often caused hesitation in battle.
• There is mention of “black boxes” in the stage play but they are often referred to as “fusion core reactors”.

See also the Secret File from the YoRHa Boys Ver.1.0 stage play pamphlet here.