Fizz's spells scale off Ability Power - consider getting items like Zhonya's Hourglass or Banshee's Veil against teams that have high burst threat - and items like Lich Bane or Rabadon's Deathcap if you think you can survive without the Health.
Since Fizz can move through units, find opportunities in lane to walk through minions and apply Seastone Trident's passive - following it up with the ability's active attack after a few seconds.
Fizz's ultimate ability, Chum the Waters, can be aimed at an enemy or towards the area where you think they'll be going.
Kai'Sa is very vulnerable to getting outranged by mages and long range carries.
Make sure to place wards in your blind spots so you can see Kai'Sa coming.
Kai'Sa is very good at picking off isolated enemies. Stick together against her.
The stat comparisons shown here underscore some valuable Fizz vs. Kai'Sa matchup statistics that can help you explain the differences and similarities between the two. Fizz’s KDA ratio ([kills + assists] / deaths) of NaN is greater than Kai'Sa’s ratio of NaN, indicating that Fizz may be more central to his team's team fighting capability than Kai'Sa..
Fizz normally has a slightly larger longest kill spree than his enemy does. Commonly, he receives a similar amount of damage to Kai'Sa. This typically indicates different amounts of tankyness; however, it can also hint that the champion with more HP has less mobility and thus is unable to flee from further harm when engaged or poked.
Both League of Legends champs are great champions. Both have their pros and cons. In League's current meta, Fizz usually wins when taking on Kai'Sa, with a 55.2% win rate. Therefore, Fizz makes a fantastic counter to Kai'Sa.
While Fizz does have a much higher winrate compared to Kai'Sa, when facing one another, Fizz also has a greater learning curve that makes him a more complex champion to learn and master. You don't need to be too worried when picking Fizz into Kai'Sa.
Moreover, Fizz has only a small amount of CC and other utility, a similar amount to Kai'Sa. This often makes her just as valuable during teamfights, especially when facing champions with a ton of burst damage.
While there isn't one best champion in League of Legends, in Fizz vs Kai'Sa matchups, Fizz is the better champ with a noticably higher win rate, similar champion depth, and a similar amount of utility to help out your allied champions during team fights.
Fizz is a great counter for Kai'Sa. You will do well by focussing your actions on keeping up your gold and cs and clearing objectives. If you can do that, you should do very well as Fizz against Kai'Sa.
If you would like to learn all of the intricacies of Fizz to counter Kai'Sa during both the lane and mid / late game phases of League of Legends, you should continue reading to pick up a few extra lessons on this matchup. If you pay attention to the build and stats shown here, you should increase your win rate by a lot and be closer to League of Legends pro players.
Fizz on average accumulates a similar amount of CS relative to Kai'Sa. Champs who on average don't take much CS usualy don't need much CS to be effective, such as supports. They are capable of scaling properly off of their abilities and first items alone. Yet, champions with a lot of CS, such as hyper-carries, usually need several high cost items to be effective. In either situation, try to do better than the values reported here to do well.
The best items to have in your Fizz versus Kai'Sa build include Lich Bane, Cryptbloom, and Stormsurge. When Fizz incorporated at least these three pieces in his build, he performed much better versus Kai'Sa than with many other commonly used counter builds. In fact, Fizz had an average winrate of 55.2% when countering Kai'Sa with these items in his kit.
To have the greatest probability of vanquishing Kai'Sa as Fizz, Fizz players should take the Electrocute, Sudden Impact, Eyeball Collection, Ingenious Hunter, Triumph, and Coup de Grace runes from the Domination and Precision rune sets. Of all the rune sets players picked for Fizz vs Kai'Sa LoL games, this blending of runes yielded the highest win rate. In fact, these runes provided a 55.2% win rate overall.
By default, tips, statistics, and builds on how to beat Kai'Sa as Fizz are displayed for all ranked divisions combined. If you want to scope the statistics and builds to a distinct division, you may use the selection menu earlier in the counter matchup guide.