When trying to counter King Bomb with Immortal, make sure to activate your ultimate only after his voice line is over and Bomb King is rolling in your direction, or else he can wait it out and detonate after your ultimate has expired.
Your illusions is a counter to Drogoz ulti; if Drogoz crashes into your illusions, he kills the illusion, not you. Hiding behind your illusion is a good idea, or move towards Drogoz and place ur illusion to soak the ulti for your grateful teammates.
Your shield shields damage from behind and in front of the shield. Given your higher mobility, use it to your advantage to confuse Ruckus. Rocket boots is also useful.
Always get Chronos. When Grover roots you with cripple, put up your shield, then rocket boots away. Loadout that allows turrets to heal you can also be useful.