As we know from Blizzard’s Reflections comic, Tracer is in a loving relationship with a non-Overwatch hero. Now, with the latest update to the PTR servers and game client, data miners have found clues that might shed light on the first in-game relationship.
Two audio clips of interactions between Mercy and Genji have sparked discussion on Reddit as to what it means.
In the audio clips, Genji refers to Mercy by her real name, Angela. Combined with the tone of his voice, there are signs of some kind of relationship between the two.
Also, in the Reflections comic, towards the end, you can see Genji writing a letter in the top left. In the bottom right, you can see Mercy reading a letter with a smile on her face. It is thought that the two frames could be related and that Mercy is reading the letter that Genji is seen writing.