Overview
Some secret characters that you can unlock from the beginning of the game.
The Characters
I came across these characters by playing around with the character selection screen. You can unlock each of them from the beginning of the game with no progress made.
How To Get Them
You can unlock each of these, from my experience, by tapping the selection button (the one that makes the character’s square turn gray) repeatedly on one of the 4 starting characters, the director, or the survivor.