I still don't know what my Darkworld weapon would be and that still deeply frustrates me. It can't be my damn phone even if I'm using it constantly. I also refuse to let it be my keyboard even if that's also something I use constantly.
Although I had the idea for a character once where they used a portable piano with a 'handle' on the end as a sort of massive cleaver-sword. But my piano isn't that so eh...
I wonder, could your fists be considered a weapon if you have nothing else to turn into one?