The super redacted character is unlocked via a secret ending. Everyone else should unlock when you or and ally defeat them in combat/sniping.
Also. Dunno if it's intentional or not but defeating an enemy with an airstrike does not unlock them.
Yeh I kinda figured it has something to do with a big red button great game tho good time killer and the bear girl is peak
Gald you like her, I'm also a fan
