Answer:
Known to accessorize with feathers, trumpets, and harps.
What is up that’s also down? What’s a smile and a frown?
I never was, am always to be. No one ever saw me, nor ever will. And yet I am the confidence of all, To live and breath on this terrestrial ball.
I usually wear a yellow coat. I usually have a dark head. I make marks wherever I go.
I'm a god. I'm a planet. I measure heat.
What is so fragile that saying its name breaks it?
Difficult
Animal
Easy
Food
Funny
Kids
Logic
What am I?