Could you make it creamier by reducing the amount of water you use? Or by using some kind of milk with it? Adding a banana would make it creamier, but I don't know if you'd want to do that.
I make a morning shake with protein/vegan meal replacement powder; frozen fruit; either juice (usually pomegranate), soy milk or water )(not much if it's water) and powdered glucosamine, and powdered calcium citrate. Once in a while, I'll use a banana, too, but I haven't lately. I never find them to be watery at all. Sometimes, I've gotten them too thick to drink, like melty ice cream. Then I just eat them with a spoon.