Power Idea: Propulsion a Repulsion gel! (From the Portal series)
Propulsion gel is orange and causes ragdolls or coated items to slide and slip around, while repulsion gel causes items to bounce.
Idea: The Blutsauger from TF2, Every hit on a person would heal whatever living thing is touching the blutslauger when it dealt damage. Some scripting needed but shouldn't be to hard for a dev like you!
Was meant to be just the movie. Didn't actually know TF2 had it as well. Thought I was being so smart with the name, too.