Answer:
What do you call a pig that is no fun to be around?
Take off my skin I won't cry but you will.
you can throw me away but I will always be coming back
I mirror your actions.
I spend most of my day eating white. When I am quick enough I get rewarded with fruit and something blue. In a dark room with blue walls I run from the ghosts that roam the halls
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.