u/Responsible-Meet-741

I figured it out and please challenge this if it makes no sense. Sorry if I spoil anything.

I discovered Legion after eating up pretty much all Marvel and Aubrey is amazing as always.

My new headcanon is that The Shadow King actually took the face of Death (as seen in Agatha All Along) because that was the most scary face he/she/it could think of. To the humans/other mutants her face isn’t scary, but for one being almost defeated and doing a lot to avoid death she would be scary.

I might mean something else after finishing the last seasons of Legion, but right now it makes sense