Once a child learns to dissociate to the point of developing DID, that wonderfully creative mind will continue to do so as deemed necessary. It becomes instinctual, and we have little awareness or control over that without help.
A DID'er can, and usually does, continue to develop parts as needed as life goes on into adulthood. Those adult parts can be just as developed as the original parts...specific likes, interests, capabilities, etc.
I hope that helps a bit.
KD