See Some Paxton Fettel F.3.A.R. Gameplay
You will have the chance to unlock him at the end of each level after first playing through a level as Point Man in the single player campaign.
Paxton Fettel offers a unique single player experience focused on his supernatural abilities giving players a new way to play through the level in a way that’s different from Point Man’s enhanced super soldier abilities. In the single player campaign, Fettel will wield his telekinetic abilities to suspend, possess, stun or crush enemies. Giving players a choice in who they play as in single player offers additional gameplay value and enables players to re-play a level using different powers and tactics.