Answer:
I am a key that is playful. What am I?
I'm a ruler with 12 agents. Half of them work in the darkness. Who am I?
I can fall off a building and live, but in water I will die. What am I?
What tastes better than it smells?
What has one eye but cannot see?
Though not a plant, has leaves. Though not a beast, has spine. Though many wouldn't need this thing, It's more valuable than wine.