Answer:
I drift forever with the current and flows to your everyday life. I make living easy but I am good at killing people too.
I live above a star who never burns. I have 11 neighbors but they never turn. My initials are p q r and sometimes s.
I can be simple or I can be complex. I can be found in this riddle or in everyday life. I can be shapes or even colors.
What goes up but never comes down?
I can be entertaining until you realize some pieces have been lost.
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.