Answer:
No matter how much rain gets on me, I won't get any wetter. What am I?
My teeth are sharp my back is straight to cut things up it is my fate.
My snake-like body cracks and burns. I cause pain but pleasure too. What am I?
The 8 of us go forth and not back to protect our king from a foe's attack. What am I?
When it comes to me you go on red and stop on green.
Black we are and much admired. Many seek us if they are tired. We tire the horse, and comfort man, and turn White when we've fulfilled your plan.