Sorry for this long wall of text.

A comparison to Lucky pre-null infection, and after he was turned into a partial hybrid of Null and Valkyrie. The Nullification process begins with bodily features changing, such as losing skin color or eye color, and spikes/a tail growing on oneself.

They’re eventually turned into a Null and are immediately determined to serve their Emperor, the only exception being that they’re either only half transformed with some sort of spell to aid their psyche from crumbling, or being a defected Null.