This will vary because unlike other stat sites we include 100% of a brackets champions played and never include champions that don't belong in the bracket.
Emerald+ Champions Analysed: 11,751,512
We include 100% of the champions played of every selected tier bracket in our analysis, we never include champions from outside the tier quoted tier.
Karthus Counters
Karthus middle vs middle Counters
Presently there is insufficent games played by Karthus middle on Patch 7 to determine the strongest middle counters. A matchup requires a minimum of 100 games to be displayed.
Lux
the Lady of Luminosity
Karthus wins against Lux 44.04% of the time which is 2.90% lower against Lux than the average opponent.
After normalising both champions win rates Karthus wins against Lux 6.02% less often than would be expected.
The average opponent winrate against Luxis 46.94%.
Sylas
the Unshackled
Karthus wins against Sylas 45.61% of the time which is 1.60% lower against Sylas than the average opponent.
After normalising both champions win rates Karthus wins against Sylas 4.72% less often than would be expected.
The average opponent winrate against Sylasis 47.21%.
Ahri
the Nine-Tailed Fox
Karthus wins against Ahri 52.21% of the time which is 3.95% higher against Ahri than the average opponent.
After normalising both champions win rates Karthus wins against Ahri 0.83% more often than would be expected.
The average opponent winrate against Ahriis 48.26%.
Hwei
the Visionary
Karthus wins against Hwei 58.22% of the time which is 8.60% higher against Hwei than the average opponent.
After normalising both champions win rates Karthus wins against Hwei 5.48% more often than would be expected.
The average opponent winrate against Hweiis 49.62%.