Keeper's Verdict can be released immediately to send the enemy straight up, take advantage of this in duels.
Iron Ambassador tends to land near walls, try to take advantage of this with Heroic Charge.
When Kayn is in terrain near you, you will get a visual warning on the edge of the terrain he's in.
Umbral Trespass requires Kayn to damage a target first. Try to dodge Blade's Reach to deny him a long range cast of Umbral Trespass.
Damage Kayn while he's in Shadow Step to shorten its duration, or apply hard crowd control (stun, charm, knockup, etc) to end Shadow Step immediately.
The stats shown on this page underscore some strategic Poppy against Kayn matchup statistics that may help you explain the differences between the pair. Poppy’s KDA ratio ([kills + assists] / deaths) of NaN is more than Kayn’s ratio of NaN, demonstrating that Poppy may be more central to her team's team fighting potential than Kayn..
Poppy often has a similar longest killing spree as her opponent does. On average, she takes less damage than Kayn. This often reflects different amounts of tankyness; however, it can also imply that the champ with increased health has less mobility and thus is unable to kite away from additional harm when engaged or poked.
Both LoL champs are great champions. Both have their strengths, weaknesses, and counters. In League's current meta, Poppy usually wins when trying to fight Kayn, with a 51.9% win rate. Thus, Poppy makes a good counter to Kayn.
While Poppy does have a higher win rate than Kayn, when facing one another, Poppy also has a lower learning curve that makes her a less complex champion to pick up and master. You still need to be cautious when picking Poppy into Kayn.
Additionally, Poppy has a lot of utility and CC, a similar amount to Kayn. This makes her just as valuable during team fights, especially when fighting champions with a lot of burst damage.
While there is not a single best champion overall in League of Legends, in Poppy vs Kayn matchups, Poppy is the better champ with a higher win rate, less champion complexity, and a similar amount of utility to help out your allies during late stage team fights.
Poppy is a decent counter to Kayn. Focus your gameplay on increasing your CS and clearing objectives. If you do that, you should do very well as Poppy against Kayn.
To truly master Poppy in order to counter Kayn during both the early game and mid / late game phases of League of Legends, you should keep reading to gather a few extra tricks and insights into this matchup. If you mind the build and tips displayed above, you will increase your win rate significantly and be closer to League of Legends pro players.
Poppy often accumulates more CS relative to Kayn. Champs who on average don't take many minion kills usualy don't have to have much CS to be effective, such as support champions. These kinds of champions are able to scale properly off of their skills, stats, and first items alone. Yet, champs with large amounts of CS, such as hyper-carries, typically need many items to be effective. In either situation, try to surpass the numbers displayed on this page to do well.
The top items to focus on in your Poppy versus Kayn build consist of Unending Despair, Sunfire Aegis, and Jak'Sho, The Protean. When Poppy used at least these three items in her build, she performed significantly better when facing Kayn than with many other typical item sets. In fact, Poppy had an average winrate of 51.9% when playing against Kayn with this counter build.
To have the best chance of crushing Kayn as Poppy, you should equip the Dark Harvest, Cheap Shot, Eyeball Collection, Relentless Hunter, Celerity, and Waterwalking runes from the Domination and Sorcery rune sets. Of all the rune combinations players used for Poppy vs Kayn counterpicks, this composite of runes yielded the best win rate. In fact, these runes averaged a 51.9% winrate overall.
If you would like to get Poppy versus Kayn tips and builds for a a particular player tier, feel free to select one from the selection menu displayed above. By default, the statistics and strategies given are computed using every game run with both champions.