If you had to pick one person to take on a journey to save the world who would you take?

I would personally take a friend that I know I can depend on. You're thinking, "Hayu, you idiot why don't you take someone like a soldier or engineer that can be more useful?". Well, if I'm going to die, or save the world successfully, I want a friend to watch my back the whole way through. If the world ends I can also blame that person for failing in my place.