Difficult
I’m the most peculiar thing, I’m sure that we have met, Maladies to you I may bring, Time or health is my theft. I’m a lifelong friend; to the disdain of your kin, I come in all colors, mainly black and white, I can be innocent, quirky, a force, or a sin, Dare turn and kick me, and I’ll put up a fight.
What am I?
Go slow, I'm normal. Go fast, I disappear. With only a trail to prove I was even here. I have a pair of wings. But I don't need them to fly. For that I have my "feet". What am I?