Something similar was asked back in '17, but didn’t get a conclusive answer.
As I understand it, the process of creating a Shadow Matoran or a Shadow Toa is as follows. One is attacked by a Shadow Leech / Kanohi Avsa / Gorast’s stinger, their inner light is drained, and if it is completely depleted, they become a Shadow being. The loss of all inner light also establishes a mental barrier that prevents that light from naturally regenerating. This mental barrier can only be broken by a specific Sonics frequency or by the Klakk, at which point the being will regenerate the Light balance they had before being drained, immediately restoring whatever moral balance they had before and gradually restoring the being’s natural armor color. Just confirming, is this how you see it?
My question is, is the total depletion of inner light necessarily accompanied by the emotions associated with Shadow and the loss of the emotions associated with Light? Or could you have a fully Shadow being that, while perhaps not as noble or honorable as your average Toa, still has a code of morals?