Katarina's abilities deal magic damage, so even if she's building Attack Damage items, get magic resistance to counter her.
Try to save a disable for when Katarina uses her Death Lotus.
The stats provided here emphasize several critical Yuumi versus Katarina counter stats that may help you grasp the differences and similarities between the pair. For instance, Yuumi’s KDA ratio ([kills + assists] / deaths) of NaN is more than Katarina’s KDA ratio of NaN, indicating that Yuumi may be more central to her team's team fighting effectiveness than Katarina. This observation is largely caused by the differences in assists.
Yuumi normally has a significantly smaller longest killing spree than her enemy does. Typically, she receives less damage than Katarina. This commonly reflects different amounts of tankyness, yet it can also hint that the one champ has less agility and thus is unable to escape additional harm when poked or engaged.
Both League of Legends champs are great. Both champs have their strengths, weaknesses, and counters. In the game's current meta, Yuumi usually loses when trying to fight Katarina, with a 45.7% win rate. Therefore, Yuumi makes a bad counter to Katarina.
While Yuumi does have a much lower winrate than Katarina, when they face off with one another, Yuumi also has a much lower learning curve that makes her a less time consuming champ to learn and master. You may get destroyed when picking Yuumi into Katarina.
Furthermore, Yuumi also has a lot of utility and CC, a similar amount to Katarina. This makes her just as valuable during teamfights, especially when fighting champions with a lot of burst damage.
While there is not a single best champion overall in League of Legends, in Yuumi vs Katarina matchups, Katarina is the better champion with a much lower win rate, less champion complexity, and a similar amount of utility to help out your allies during teamfights.
Yuumi is a bad counter to Katarina. Focus your play on keeping up your gold income and destroying objectives. If you do that, you should do very well as Yuumi against Katarina.
If you would like to truly master Yuumi to counter Katarina during both the laning and mid / late game phases of League of Legends, you should continue reading to gather a few extra tips and tricks for this matchup. If you listen to the build and tips displayed here, you should grow your win rate significantly and be closer to League of Legends pro players.
Yuumi most often picks up a lot less CS compared to Katarina. Champs who on average don't take much CS typically don't need much CS to be effective, such as sup champs. They are capable of scaling well off of their skills, stats, and first items alone. Yet, champs with large amounts of CS, such as hyper-carries, often need many items to be effective. In either case, try to exceed the values shown here to do well.
The best items to prioritize in your Yuumi versus Katarina build include Redemption, Dream Maker, and Moonstone Renewer. When Yuumi combined at least these three items in her build, she performed significantly better versus Katarina than with many other commonly used builds. In fact, Yuumi boasted an average win rate of 45.7% battling Katarina with these items in her kit.
To have the best probability of annihilating Katarina as Yuumi, Yuumi players should take the Summon Aery, Manaflow Band, Transcendence, Scorch, Font of Life, and Revitalize runes from the Sorcery and Resolve rune sets. Out of all the rune combinations players picked for Yuumi vs Katarina clashes, this mix of runes resulted in the highest win rate. Moreover, these runes gave a 45.7% win rate overall.
If you would like to get Yuumi x Katarina tips and counter stats for a a particular skill level, feel free to select one from the selection menu displayed above. If viewing for the first time, the statistics and guides shown are computed using every round finished with both champions.