Zed's Shadow Slash can only slow you if his shadow hits you with it.
Zed receives bonus effect from Attack Damage items he purchases, so Armor is super effective against him.
After Zed uses his Living Shadow, he is at his most vulnerable as his damage, slow, and mobility are both dependent upon it.
The stats shown on this page emphasize some critical Yuumi against Zed counter statistics that can help you distinguish the distinctions between the pair. As an example, Yuumi’s KDA ratio ([kills + assists] / deaths) of NaN is more than Zed’s ratio of NaN, indicating that Yuumi may be more central to her team's team fighting potential than Zed. This observation is in large part caused by the differences in assists.
Yuumi normally has a significantly smaller longest killing spree than her counter does. On average, she takes less damage than Zed. This commonly reflects different amounts of tankyness, yet it can also imply that the one champ has less agility and thus is not able to escape additional damage when engaged or poked.
Both League of Legends champs are great champions. Both have their pros and cons. In League's current meta, Yuumi usually loses when facing off against Zed, with a 47.6% win rate. As a result, Yuumi makes a poor counter to Zed.
While Yuumi does have a lower win rate compared to Zed, when facing one another, Yuumi also has a much lower difficulty level that makes her a less challenging champion to develop with. You should expect to face a difficult match when picking Yuumi into Zed.
Furthermore, Yuumi also has a lot of CC and other utility, a similar amount to Zed. This often makes her just as valuable during team fights, especially when facing champions with a lot of burst damage.
While there isn't a single best champion overall in League of Legends, in Yuumi vs Zed matchups, Zed is the better champ with a lower win rate, less champion complexity, and a similar amount of utility to help out your team members during teamfights.
Yuumi is a terribly counter for Zed. Make sure you focus your gameplay on keeping up your gold income and taking out objectives. If you can do that, you should do very well as Yuumi against Zed.
If you would like to truly master Yuumi to counter Zed during both the lane and mid / late game phases of League of Legends, you should continue reading to pick up a few extra tips and tricks for this matchup. If you listen to the build and stats displayed here, you should grow your win rate significantly and be closer to League of Legends pro players.
Yuumi typically gets a lot less CS compared to Zed. Champs who on average don't get many minion kills often don't have to have much CS to be valuable teammates, such as support champions. They are able to scale well off of their abilities and first items alone. Yet, champs with large amounts of CS, such as hyper-carries, typically need many items to be effective. In either case, try to exceed the values reported on this page to do well.
The best items to prioritize in your Yuumi versus Zed build consist of Ardent Censer, Imperial Mandate, and Moonstone Renewer. When Yuumi incorporated at least these three pieces in her build, she did significantly better against Zed than with many other typical item sets. In fact, Yuumi had an average winrate of 47.6% when countering Zed with this build.
To have the highest chance of vanquishing Zed as Yuumi, you should equip the Summon Aery, Manaflow Band, Transcendence, Scorch, Font of Life, and Revitalize runes from the Sorcery and Resolve rune sets. Out of all the runes players picked for Yuumi vs Zed matchups, this composite of runes resulted in the greatest win rate. Notably, these runes averaged a 47.6% win rate overall.
If you would like to view Yuumi vs Zed tips and counter stats for a an individual player tier, feel free to select one from the selection menu displayed above. If viewing for the first time, the stats and build suggestions given are calculated using every match finished with both champions.