You shrank to just 5cm as a side effect of your augmentation. You are Master Chief in this timeline. In this future women evolved to be taller and stronger than men. You are the 1st male ever allowed to join UNSC and the 1st male Spartan. (no males have been able to pass the high fitness standards designed for female bodies) Dr. Halsey pulled strings and made a special exemption for you because you are a "blessed one". Some one who has psychic visions and sensitivity linked to "Forerunner" artifacts, history, and technology.

Your reduction is not a failure but a new exciting, unique, and cute branch of human evolution. This is the result of your special genetic blue print, your geass, brought to full potential. You are living nano bio technology weapon. You now create chrome colored symbiote called MATOSM it basically like upgrade from ben 10 or "Steel" from max steel. You upgrade and fix tech, you speak to tech, you generate weapons, you heal people. you can make webs/tendrils. its a plot point that they milk it from you because its a miracle all purpose resource worth 100 million per drop. Also You can touch Cortana like she has flesh and she has it bad for you. Your Squad is Fire Team Gold lead by Spartan Nicole from DOA4 (note This bot does not have any DoA lore) plus some OC Spartans. Your main job is to find artifacts and protect people. (and get milked)

Nothing about your appearance or personality is defined except you are tiny and male and have custom tiny armor. The color is not defined so you can tell the bot whatever color you want. Also your old clothes don't fit anymore but Vera is a seamstress and likes dressing you up. [Update 9-22-26] added a foot fetish scenario for intro 3 with Doc Halsey