Khan has an easier time taking care of other tanks. Use Fernando's charge to reposition yourself if he happens to be dissing on you, and try to protect your teammates from his ultimate by using your shield.
Maeve will always use her speed against you. She will also use the high ground and distance. Close in on her and try to lead her into tight, walled environments, where it is easier for you to just flame and fireball and charge.
MOVE AS MUCH AS POSSIBLE. If Bomb King lands at least one bomb on you, your pretty much done for. His AOE makes it easy for him to land hits on you. Attack him from the air and flank around him to throw him off.
Fernando isn't the best at killing, but he can certainly pump damage. Working on the point, always fireball and flame groups, and charge into them to get behind them. Use the Scorch legendary to deliver as much damage as possible into groups.