Even if I hate him ingame for me it’s gotta be Genji.
But that might also be because I love stealth games so I am really biased towards stealthy characters (ofcourse he isnt really stealthy ingame but he literally is a cyber-ninja).
A singleplayer game would also allow for a in depth talent tree since now they only gotta worry about one character + PVE balance can be a bit OP.
As far as I know singleplayer games aren’t really blizzards thing though which is kind of a shame. I think PVE in general would have been much better as its own game so you dont have to worry about balancing issues.
I mean reworking a hero when that hero also has a talent tree sounds like a nightmare to me.
I think the Sojourn cinematic showed that she could easily have her own game. A retired veteran with cybernetic enhancements wearing a cool Tron-like suit while her apartment is equipped with high tech operations tech to monitor events around the city. You have ti fight these under ground rogue robots but also avoid attention from the local police as they have detectives constantly on your ass. And then you have Murphy her pup which would be an instant fan favorite in a solo game. You can even explain away her bland in game personality as a front to keep the detectives away like a Clark Kent monicker.