Answer:
Only one color, but not one size. Stuck at the bottom, yet easily flies. Present in sun, but not in rain. Doing no harm, and feeling no pain.
A man shot two arrows at its center and missed both times, but using a sword swung once at its center and hit it twice.
What is full of holes, but can still hold a lot of water?
I have four legs but no tail. Usually I am heard only at night.
It is a part of us, and then replaced. It escapes out bodies, to a better place. The world becomes its sizeable home. Its passions unrestraint, the planet it roams.
A doctor might remove one from the neck of a Dracula victim.