There's no way we can "please" or "disappoint" Him, because He already knows who we are, and knows what we are thinking even before we do.
He knows who and what we are "in our hearts," from first to last.
He does not need any "contribution" from us to be Who He IS.
As to "What need or want would he have for us?" — He wants relationship with His sons, who He made out of love, for love.
This is my understanding.
If God is unchanging, we have nothing to contribute, we can neither please him or disappoint him. What need or want would he have for us?
Keep in mind that God is Spirit, Energy. God is Love, Truth, and Light (Illumination). Did He create our Spirit in His image? Yes! Is that Love, Truth, and Light constant? Yes!
Is God constant? Constant can mean several things. God is faithful in His promises to man. Is He rigid? Only in that Justice is rigid. God created the Universe in a way that we punish and reward ourselves. Is that constant? Well, it is predictable.
Can we please or disappoint God? What is Love? That is your answer.
Pray earnestly and ask for God's guidance. You will get it.