OW Hero: Genji

Whilst Pharah doesn't have any abilities Genji can't reflect, Pharah is generally at an altitude that Genji can't attack effectively. So long as she keeps mind of his reflect, Pharah should spam out Genji.

Genji's mobility is the only counter to Pharah. While her flight makes it really hard to hit Genji's sword dash or his ult.

If you use jump and strafe down with your jet-pack, you can be an easy target for Genji. His three stars can be timed for an easy hit(s) as you come down slowly. So if he's throwing while you're floating down, just drop quickly by cutting the jet-pack.