While carrying a Survivor you benefit from the following effects:

Decreases Wiggle effects, which cause you to strafe sideways, by 75 percent.
Increases Wiggle duration by 4/8/12 percent.

Whenever you are stunned by a Survivor, that Survivor suffers from the Exposed Status Effect for 10/15/20 seconds.

Hubris has a cool-down of 20 seconds

The Scratch Marks left by Survivors spawn slightly/moderately/considerably closer together.

Each time you hook a Survivor, Leverage activates and gains 1 Token, up to a maximum of 10 Tokens:

For each Token, the Altruistic and Personal Healing speeds of Survivors are reduced by a stack-able 3/4/5 percent for the next 30 seconds, up to a maximum of 30/40/50 percent.