Answer:
I have keys but no locks. I have space but no room. You can enter but can't go outside. What am I?
I come without being fetched at night hides away as soon as daylight strikes. Although I may look small I am much mightier than what you can imagine.
I am the kind of fish that chases a mouse.
I am the only word that looks the same when spelled upside down.
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
What do you purposefully put lots of in and on your body, but run away from when you encounter it outside?