HERE is a post by Chris Brady on the character of God in Genesis 1 that is well worth a read.  My favorite quote from the post is:

Given that God is the subject of almost every verb in the opening creation story of Genesis it is surprising that God is never provided with any sort of description or introduction. It is left to the reader to deduce from the text the nature of this creator from the text.

It really would be helpful to have some kind of theological description of God that would precede the creation account.  But, instead we work with what we have and try to describe God based upon what he does in the passage.