Harry would love Newt. He was so hurt after Sirius died and Newt is used to healing hurt creatures. He would show Harry his animals, talked about taking care of them and in between those talks he would gently coax Harry into speaking about his own feelings (because Merlin knows this boy needs to talk about his feelings instead of bottling them up), about his pain and fears. Maybe an old Niffler would give Harry one of his coins?
And after Graves is done kicking everyone's ass from Dumbledore to Voldemort, he finds his husband with Harry, feeding creatures, and it makes him a little sad to realize that a few decades ago this young man helping his husband could be Credence.