Make sure to buy items that will evolve at least 1 or 2 of your spells.
Work with your teammates to set up your Ultimate and optimize damage with your passive.
Try to catch enemy carries alone to burst them with Icathian Rain.
Pale Cascade orbs only last a few seconds. Avoid Diana and engage her after the shield dissipates.
Diana can play very aggressively if she uses Lunar Rush without Moonlight, but you can punish her by slowing or stunning her when she has no way to get back into position.
Dodge Crescent Strike, or move to safety if you are affected by Moonlight.
The stats provided here clarify several vital Kai'Sa vs. Diana matchup statistics that can help you figure out the differences and similarities between these two champs. As an example, Kai'Sa’s KDA ratio ([kills + assists] / deaths) of NaN is greater than Diana’s KDA ratio of NaN, showing that Kai'Sa may be more central to her team's team fighting capacity than Diana..
Kai'Sa often has a similar longest killing spree as her counter does. Typically, she receives less damage than Diana. This often reflects different amounts of tankyness, but it can also show that the champion with increased health has less mobility and thus is not able to escape further harm when poked or engaged.
Both League champs are great champions. Both have their strengths, weaknesses, and counters. In League's current meta, Kai'Sa usually loses when taking on Diana, with a 46.5% win rate. Therefore, Kai'Sa makes a bad counter to Diana.
While Kai'Sa does have a lower win rate compared to Diana, when on opposite teams, Kai'Sa also has a greater learning curve that makes her a more difficult character to develop with. You may get destroyed when picking Kai'Sa into Diana.
Moreover, Kai'Sa also has almost no amount of CC and other utility, a similar amount to Diana. This often makes her just as valuable during team fights, especially when fighting champions with a lot of burst damage.
While there isn't one best champion for every situation in League of Legends, in Kai'Sa vs Diana matchups, Diana is the better champion with a much lower win rate, more champion depth, and a similar amount of utility to help out your allied champions during teamfights.
Kai'Sa is a garbage counter to Diana. You will do well by focussing your actions on increasing your CS and destroying objectives. If you can do that, you should be able to stand on your own as Kai'Sa against Diana.
If you would like to learn all of the intricacies of Kai'Sa to counter Diana during both the lane and mid / late game phases of League of Legends, you should continue reading to learn a few extra tricks and insights into this matchup. If you listen to the build and tips presented above, you will increase your win rate by a lot and be that much closer to League of Legends pro players.
Kai'Sa usually gets more CS relative to Diana. Champions who typically don't acquire many minion kills often don't need much CS to be valuable teammates, such as sup champs. They are capable of scaling well off of their skills, stats, and first items alone. Yet, champions with a lot of CS, such as hyper-carries, usually have to have a lot of items to be effective. In either case, try to do better than the values displayed on this page to do well.
The ideal items to use in your Kai'Sa versus Diana build consist of Zhonya's Hourglass, Terminus, and Kraken Slayer. When Kai'Sa included at least these three items in her build, she did much better vs. Diana than with most other common builds. In fact, Kai'Sa boasted an average win rate of 46.5% battling Diana with this counter build.
To have the best chance of defeating Diana as Kai'Sa, you should equip the Lethal Tempo, Presence of Mind, Legend: Bloodline, Coup de Grace, Magical Footwear, and Biscuit Delivery runes from the Precision and Inspiration rune sets. Out of all the rune builds players picked for Kai'Sa vs Diana face-offs, this combo of runes resulted in the best win rate. Notably, these runes gave a 46.5% winrate overall.
By default, tips, stats, and builds on how to beat Diana as Kai'Sa are displayed for all skill levels combined. If you want to narrow the stats and builds to an individual division, you may use the selection menu located earlier on the page.