Answer:
What should you do when you see a green man?
I am not alive, though I never die, to no one I've ever told a lie, today I can be god's warrior, and serve him with no horror, but tomorrow I might be devil's knight, for I am what ends the light.
What has a head and a tail but no body?
What is always coming every day, but never arrives until the next?
A beautiful succession of sounds.
It is something you will never see again.
Easy
Animal
Difficult
Food
Funny
Kids
Logic
What am I?