No one knows what God "looks like" because God is invisible and doesn't have a physical body as we do. But we can learn about God and see what God acts like by learning about his Son, Jesus. In the Bible we can read about how Jesus lived, how he treated people, and what he taught. That's what God is like.
Jesus replied, "Don't you even yet know who I am, Philip? And I have been with you for all this time! Anyone who has seen me has seen the Father! So why are you asking to see him?" (John 14:9)
John 1:18; 5:37; 6:46; 1 John 3:2