Steven Universe and Batman- Gotham Rain

What if after the events of season 2 of Steven Universe, Greg all of sudden is killed by an unknown person. After this Steven freezes up and runs away from the gems. He runs so far that he ends up in Gotham city where he encounters Bruce Wayne himself. After a while Bruce tells Steven who he really is and Steven becomes the new Robin for Gotham after Jason Todd's death. But this is Gotham city so danger is always around. The one known as the Arkham Knight is out to cause havoc on Gotham.