What are ghosts' intentions?
Since ghosts are not real, they have no intentions. I'm sorry if this does not help you, but it's currently the truth. The first step is to prove ghosts are real. If that is ever proven, we can proceed top the next step and wonder what their intentions are.
The word intentions is a common plural noun. It requires no apostrophe. She had the best intentions. My intentions were made clear. If the word intentions has a possession or belonging, it needs an apostrophe. But I cannot think of an instance when "intentions" could own or possess anything! It would be the noun preceding intentions that needs the apostrophe.
fast staff ghosts, are ghosts that are at least 7 seconds faster than the normal ghost. Expert staff ghosts are ghosts that you can race in Time Trials. These ghosts are made by proffessionals that work at Nintendo who set this time. These ghosts are almost impossible to beat because they are so fast.