A friendly ghost named Six

Davis has apparently reached the imaginary friend stage of life.  He recently befriended a ghost named Six.  Unlike scary ghosts, which have teeth, Six is small, blue and very friendly.  He is apparently smaller than a basketball, but bigger than a tennis ball (so perhaps right around the size of a candlepin bowling ball).  John and I have asked a lot of questions to get to know Six better and you may not be surprised by the fact that Six likes a lot of the same things that Davis likes.  Things we know about Six:

• He has arms and hands; they got caught once in the door to the laundry room.
• He moves very quickly, which is good, because then no matter what Davis says, you know there's no way you stepped on him.  
• He likes to throw stuffed animals off the bed and play with cars and trains.
• His favorite foods are applesauce and yogurt.  Although he moves quickly, he apparently eats rather slowly.
• He likes to be carried around, or at least Davis pretends to scoop him up occasionally, it's hard to say whether Six really likes that or not (same goes for Domino the cat). 

We are currently trying to convince Davis that Six can help protect him from scarier ghosts that apparently inhabit our house as well.