If he has his shield larger with his talent, try to stay on the side they are on without them knowing. This makes it easy to hit them because his shield only stops attacks from the front. (if you are a tank, keep pushing them back past it to hit 'em)
Ying is able to teleport to her allies during her ult, so when she does try to kill her on sight. She can still have her ult going after she dies, but it can make it harder for the enemy to be healed. Also, remember she can teleport multiple times!
Find where her illusions are and use that to your advantage. If someone targets her, she will likely try to teleport away and confuse you. Surprise her by having someone else near her spot or quickly running after her while staying away from enemies
Try to place an illusion off to the side of the battlefield to teleport back to if someone, especially someone like Ruckus, starts to target you. This will work even if the illusion expires, but try to keep one hidden from the enemy at all times.