They are a popular ship due to their canon connection through Overwatch, although the ship itself is not canon. However, Overwatch was destroyed in an explosion and Jack was presumed dead. He became a vigilante and fights for justice, as seen in the animated short ' Hero '. Gabriel Reyes used to be the leader of Overwatch before becoming part of Blackwatch , Overwatch's covert black ops division.
The two first met during the Omnic Crisis. They became friends quickly and joined Overwatch together. After the crisis Jack was promoted to leader of Overwatch. A rift was created between the two since Gabriel was passed over for the opportunity. Intel was given to Jack telling him that a businessman named Antonio had attacked an Oslo facility.
It involves a rivalry between two heroes who were recruited to save the world, did so — and promptly let jealousy tear not just their friendship, but the team that saved the world apart from within. When he was old enough, Morrison joined the military — with every intent to return home after a few years in service. But Morrison caught the eye of his superiors due to his strong work ethic and courage.
Also we know Reaper has a family that he still watches over or at least watched them around Christmastime. I always wondered why something so random came to be. Like compared to Pharmercy, McHanzo comes out of nowhere. Please no. It would be cute but no.