For deformed i think it would be something like reduce incomming damage in area around zombie by 75%.
Predator could reduce weapon fire rates by 50%
Fast could evade nades
Classic could push/pull props stonger
Poision could create a cloud that obviously distorts view by humans but also rapidly heals zombies in it very fast.


Things that chance knockback would not be very possible as that is handeld by the zombie mod itself as veriables set for all plaers of a class.