Default - unlocked by simply existing in the same space and time as Going Under
The Contractor - unlocked by finishing Joblin
The Flirt - unlocked by finishing Winkydink
The Miner - unlocked by finishing Styxcoin
The Zoomer - unlocked by finishing overtime 1
The Fool - unlocked by finishing overtime 2
The Soldier - unlocked by finishing overtime 3
The Haunt - unlocked by finishing overtime 4
The Uncanny - unlocked by finishing overtime 5
The Crustacean - unlocked by finishing overtime 6
The Impostor - unlocked by finishing overtime 7