Answer:
I'm really blue but when you see me I'm red. You don't see me too often. I'm there for you if you're hurt.
With three leaves, I am just a plant. Add another leaf and everyone will want me for good luck. What am I?
I am a person who pretends to be someone else
I am essential to life on earth! I am split into thirds. Two thirds are the same. One of the thirds is 8. The other two are 1 each.
I can run but not walk. Wherever I go thought follows close behind.
Though not a plant, has leaves. Though not a beast, has spine. Though many wouldn't need this thing, It's more valuable than wine.