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.
Janna's at her strongest when buffing another ally. If you can harass her ally, it will weaken her ability to fight you.
Save an interrupt ability for when Janna uses her ultimate.
Listen for the charge up sound on Howling Gale in case Janna is trying to hit you with it from off screen or from brush.
The stats shown here highlight several influential Fizz against Janna matchup statistics that can help us explain the distinctions between this set of champions. Fizz’s KDA ratio ([kills + assists] / deaths) of NaN is better than Janna’s KDA ratio of NaN, indicating that Fizz may be more central to his team's team fighting effectiveness than Janna. This observation is largely a result of the difference in kills.
Fizz usually has a much larger longest kill spree than his counter does. Commonly, he takes more damage than Janna. This commonly reflects different amounts of tankyness, yet it can also illustrate that the one champ has less mobility and thus is unable to flee from further damage when engaged or poked.
Both League of Legends champions are great. Both champs have their strengths, weaknesses, and counters. In the game's current meta, Fizz usually wins when playing against Janna, with a 51.5% win rate. Therefore, Fizz makes a good counter for Janna.
While Fizz does have a higher win rate compared to Janna, when they face off with one another, Fizz also has a lower difficulty level that makes him a less complex champion to develop with. You still need to be cautious when picking Fizz into Janna.
Furthermore, Fizz has almost no amount of utility and CC, a similar amount to Janna. This makes her just as valuable during team fights, especially when facing champions with a lot of burst damage.
While there is not a single best champion overall in League of Legends, in Fizz vs Janna matchups, Fizz is the better champ with a higher win rate, less champion complexity, and a similar amount of utility to help out your allied champions during late stage team fights.
Fizz is a decent counter for Janna. You will do well by focussing your gameplay on keeping up your gold and cs and clearing objectives. If you do that, you should do very well as Fizz against Janna.
To truly master Fizz to counter Janna 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 suggestions shown above, you should increase your win rate significantly and be that much closer to League of Legends pro players.
Fizz usually picks up much more CS as Janna. Champs who typically don't take many minion kills typically don't require much CS to be effective, such as supports. They are able to scale well off of their abilities and first items alone. Yet, champions with a lot of CS, such as hyper-carries, usually have to have several high cost items to be effective. In either case, try to do better than the numbers shown on this page to do well.
The ideal items to focus on in your Fizz versus Janna build consist of Rabadon's Deathcap, Shadowflame, and Stormsurge. When Fizz bought at least these three items in his build, he performed a lot better against Janna than with most other common builds. In fact, Fizz had an average winrate of 51.5% when playing against Janna with this build.
To have the greatest chance of beating Janna as Fizz, you should use the Electrocute, Sudden Impact, Eyeball Collection, Ingenious Hunter, Manaflow Band, and Transcendence runes from the Domination and Sorcery rune sets. Out of all the rune sets players used for Fizz vs Janna matchups, this set of runes yielded the greatest win rate. In fact, these runes provided a 51.5% winrate overall.
By default, tips, statistics, and builds on how to beat Janna as Fizz are presented for all ranked divisions combined. If you would like to scope the statistics and builds to an individual rank, you may use the selection menu located earlier on the page.