Of course there is.
A joke power to lighten the mood (if needed):
"In Soviet Russia....."
Any effect on you is instantly reversed. For instance, instead of vampires drinking your blood, your blood drinks vampires. Instead of werewolves biting you, you bite werewolves. There are some things you shouldn't do with this, such as teleport, ride a bike or acquire superpowers.
Pros:
-You'll never get sick; you infect viruses.
-You'll never grow old; old grows you.
-You won't lose your superpowers; your powers will lose you (though it's essentially the same).
Cons:
-Powers used on this may produce unpredictable effects.
-It is always in affect; healing abilities will harm you and you'll levitate Telekinesis.
-It's a joke power.