Answer:
You saw me where I never was and where I could not be. And yet within that very place, my face you often see.
Lighter than what I am made of, More of me is hidden Than is seen.
When liquid splashes me, none seeps through. When I am moved a lot, liquid I spew. When I am hit, color I change. And color, I come in quite a range. What I cover is very complex, and I am very easy to flex.
When set loose I fly away. Never so cursed as when I go astray.
What is it something that you always have but you always leave behind?
Special abilities and brightly colored underwear are all you need to be one of these.
Difficult
Animal
Easy
Food
Funny
Kids
Logic
What am I?