>>95806810
>black strand organ tissue
>acting as a non-Newtonian armored suit
Muscle fibers anon.
Something like nanotech artificial muscle replacement.
With the ability to shed some of the fibers to form a suit of armor.

Alternatively, combine the two in the form of a nanobot assembling implant that makes three distinct types.
>repair nanites
That's your heroic vigor and speedy regeneration.
>artificial muscle fiber builders
Give enhanced strength and durability.
>subdermal armor builders
Give minor (small arms and the like) protection.
Putting it into overdrive, aka "super" mode, produces a suit of armor with muscles attached, acting as an exoskeleton.
And for the organic version you simply make the machines and materials, well, organic.