I said it once, twice, three times and now four times... I've found that it can fit this thread nicely as it is also pretty random:
The power to manipulate and reshape my own living flesh into an endless range of disfigured and hideous shapes. (I'm basing most of the ideas for appearance on the game Dead Space by the way). So therefore I could sprout bony spikes out of the palm of my hand and an extra set of limbs could burst of my stomach, I could sprout giant spider arms out of my back or turn my legs into a long whip like tail with a barbed spike on the end and my arms could get stronger and function as legs. I could sprout fangs or mandibles as well. I could make the skin of my legs and arms merge together into wings and fly. Or sprout tentacles out of my back or even split myself into several independant organisms. I could sprout flood-like tentacle claws out of either arm. The possibilities are ENDLESS.
My flesh, bones, organs and even blood... like clay can be moulded and reshaped into anything.
That power would be cool but even if I was the ultra cool superhero I'd still get ported over by the other superheros who are also tragic brooding rebels but have slightly 'sexier' super powers. And therefore my alias Nomad would be very appropriate.