supports HTML5 video
It may sound silly, but it would be really versatile.
You try to punch him, and he grows a defensive tumor and it explodes in your face.
He needs to get around quickly, so he grows tumors under his feet and uses them to bounce, once again exploding every time he hits the ground.
He can throw tumors at you. Leaving you blind and disgusted.
He can shield you and your friends by growing a giant tumor around you, this requires a bit of stamina though, and you risk drowning in the goo if you don't get out.
Can break a high fall, even from an airplane.
I'm sure many more useful skills.
THE THAUMATURGIC TUMOR MAN
Bono did you ever get in?
Yeah you have to answer a moral test form.