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.
Be careful about how close you let Viktor get to you. Viktor's control of the battlefield increases with his proximity to his opponent.
Be aware of how many augments Viktor has upgraded by looking at the color of the light on his staff (purple, yellow, blue, red).
The stat comparisons provided here underscore some important Fizz versus Viktor matchup stats that can help you explain the differences between this set of champs. Fizz’s KDA ratio ([kills + assists] / deaths) of NaN is better than Viktor’s KDA ratio of NaN, showing that Fizz may be more central to his team's team fighting capability than Viktor. This observation is in large part a result of the difference in kills.
Fizz typically has a slightly larger longest kill spree than his enemy does. Typically, he takes more damage than Viktor. This typically indicates differing health capacities, but it can also indicate that the one champ has less mobility and thus is unable to kite away from additional damage when poked or engaged.
Both League of Legends champions are great. Both have their pros and cons. In League's current meta, Fizz usually wins when playing against Viktor, with a 53.1% win rate. Therefore, Fizz makes a great counter to Viktor.
While Fizz does have a higher win rate compared to Viktor, when on opposite teams, Fizz also has a lower level of difficulty that makes him a less difficult champion to learn and master. You don't need to be too worried when picking Fizz into Viktor.
Moreover, Fizz also has almost no amount of CC and other utility, a similar amount to Viktor. This makes her just as valuable during teamfights, especially when facing champions with a lot of burst damage.
While there is not a single best champion in League of Legends, in Fizz vs Viktor matchups, Fizz is the better champion with a noticably higher win rate, less champion complexity, and a similar amount of utility to help out your team members during late stage team fights.
Fizz is a great counter to Viktor. You will do well by focussing your gameplay on keeping up your gold and cs and destroying objectives. If you are able to do that, you should hold your own as Fizz against Viktor.
If you would like to learn all of the intricacies of Fizz in order to counter Viktor during both the laning and mid / late game phases of League of Legends, you should keep reading to learn a few extra lessons on this matchup. If you listen to the build and stats presented here, you will increase your win rate significantly and be closer to League of Legends pro players.
Fizz often racks up a similar amount of CS as Viktor. Champions who typically don't earn many minion kills typically don't have to have much CS to be effective, such as sup champs. These kinds of champions are capable of scaling well off of their abilities and first items alone. Yet, champions with large amounts of CS, such as hyper-carries, typically need many items to be effective. In either case, try to do better than the values shown on this page to do well.
The top items to prioritize in your Fizz versus Viktor build include Rabadon's Deathcap, Shadowflame, and Stormsurge. When Fizz combined at least these three pieces in his build, he performed much better when fighting Viktor than with most other common item sets. In fact, Fizz had an average win rate of 53.1% when playing against Viktor with this build.
To have the best probability of crushing Viktor as Fizz, you should take the Electrocute, Sudden Impact, Eyeball Collection, Treasure Hunter, Triumph, and Coup de Grace runes from the Domination and Precision rune sets. Out of all the rune sets players used for Fizz vs Viktor LoL games, this combination of runes resulted in the highest win rate. Notably, these runes averaged a 53.1% win rate overall.
If you would like to get Fizz vs Viktor tips and counter builds for a a specific skill level, feel free to select one from the selection menu displayed above. At first, the stats and guides given are computed using every round run with both champs.