So apparently there are two types of Dream Eaters, one good and one bad. The good, are the Spirits. They’ll be by your side trying to preotect you, as you journey through Kingdom Hearts: DDD. The other, Nightmares, of course. I’m sure they try to hurt you, in more ways then one.
We do know that the AR function will be used for you to be able to feed and pet their Spirits. You’ll also be able to play mini-games in order to improve your relationship with your Spirit.
The release date for Kingdom Hearts on the 3DS is July 31st in North America.