You get no powers, but you get to choose any 18 real world weapon of your choosing.
His abilities: Intense shapeshifting, Durability/Enhanced. Body manipulation (weaker if its not his own.) Absorbtion, Speed/Peak Human.
Some tips: Dont get to close to him, dont end up like the guy in the pic.
He's not that good with close combat, that yellow hand isn't as strong as it looks. however he's also really fast, so dont try running, it wont end well for you.
And lastly, try shooting him, no matter what he shapeshifts into, his injuries remain. (i:e if you cut off his arm, he'd have to wait a bit and shapeshifting it back takes time) he also can turn his extended extra arms into weapons aswell. Not overkill, thats for later. (Also note, he still mostly adheres to the laws of phsyics)