Answer:
I am a type of weapon for SCI-FI characters
the only amusing part of the body
My full powers come when my makers are dead. I await a heavy hat to put on my head. What am I?
I am round as an apple, deep as a cup. All the King's horses can't pull me up. What am I?
I am heavy forward, but backward I'm not. What am I?
Give it food and it will live, give it water and it will die.