Answer:
There is someone, and there is always another, for without the other, there wouldn't be one
When you stop and look, you can always see me. If you try to touch, you cannot feel me. I cannot move, but as you near me, I will move away from you.
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.
Slayer of regrets, old and new, sought by many, found by few.
What is the heart of many risks, has a heart, but is not a living being?
You use it between your head and your toes, the more it works the thinner it grows.
Difficult
Animal
Easy
Food
Funny
Kids
Logic
What am I?