I’d have to say Mauga, Sombra and Kiriko if we had to pick one from each role.
Mauga was underwhelming and mind-numbingly stupid to play. He needs to have more focus be put into using both miniguns by increasing the incentive, and also nerfing just going ARGRHHGHGHHGH and using both. Also double heart attack needs to be deleted, it’s a stupid ability.
Sombra should be publcially executed, or worse, made a Support. There’s no fixing her otherwise.
Kiriko should lose her Suzu invincibility PERIOD. Also remove the anti-stun effect, it only cleanses debuffs and slows, but you can still be hit and damaged. You can reduce the cooldown to like 8 seconds or something. And he teleport shouldn’t work through walls, going from spawn to point in 0.2 seconds is stupid.