Here's the whole set of concepts for the main(ish) cast of a post-apocalyptic old-school dungeon crawler with a twist.
The oldschool part is the way the world is presented (fake first-person 3D where you only make 90 degree turns)..
The twist is bashing samey enemies in non-descript labyrinths gets old quick so the setting is a (hopefully) vibrant city and there's going to be an actual story (with a structure not unlike interactive fiction).
Art by Katarzyna Odrobińska https://www.artstation.com/katodrobinska