Answer:
I let water fall on you while everyone else stays dry.
Two in a whole and four in a pair. Six in a trio you see. Eight's a quartet but what you must get is the name that fits just one of me.
I dig out tiny caves and store gold and silver in them. I also build bridges of silver and make crowns of gold. Sooner or later everybody needs my help yet many people are afraid to let me help them.
I've been argued on my color. Without me you'll die. So many attempts on your life use me so make sure you have many of my White friends.
In Paris but not in France the thinnest of its siblings.
What gets broken without being hold?