Build and Runes
Avoid diving a Poppy due to her passive making her deceptively tanky.
Only the target selected by Poppy’s ultimate can damage/CC her during the duration. You need to choose quickly if you’re going to stay and fight her, or if you’re going to run away from her.
Don’t be next to a wall when targetted by a Poppy as her Heroic Charge will stun you.
By shielding Poppy’s target you delay her assassination attempt while her ultimate is active. If her target survives the duration of her ultimate, Poppy becomes useless as she can be focused easily.