Jesus: Hand-to-Hand
Scout, Bruiser, and Warrior survivors have more health, and their attacks deal more damage.  The percentage increase for additional health and damage is dependent on the level of Jesus' Hand-to-Hand; the higher the level the greater the increases.

Michonne: Thinning the Herd
Your team's melee kills have a chance of reducing threat and a chance of regaining an action point.  The percentage chance of reducing threat and regaining a charge point is dependent on the level of Michonne’s Thinning the Herd; the higher the level the greater the increases.

Jerry: Bodyguard:  
When Jerry or an adjacent ally is damaged, there is a 35% chance (upgradeable to 60%) that the damage is reduced by half. If the trait triggers, the word “Bodyguard” pops up above your survivor.