Answer:
I scribble forms of the finest letter, And repel elements of the harshest weather. I am an arrow-aimer and a dust-breaker.
What has a mouth but can't chew?
I can ruin your day, or darken your life. And while I'm expected, I'm never alright. I'm bad for business, and worse for your hair. Wherever I am, there's something not there.
What has thirteen hearts But no body or soul?
Though easy to spot, when allowed to plume, It is hard to see, when held in a room.
People take me on walks and I run and have fun. What am I?