For Jermaine Rivers, whose casting news comes via Heroic Hollywood, playing Shatter requires thick skin.
The bullet “shattered” a portion of his head but ultimately his rock hard skin saved him from dying and led to the character joining Postman’s Morlocks.
Specifically, skin thick enough that it can stop a bullet as the character unsuccessfully attempted suicide in his teens upon realizing he was becoming a mutant.
Given the character’s Morlock roots, it would be a great nod to the X-Men if he happened to live in a sewer, and even better if that sewer was in Chicago.