

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.
Bronze Champions Analysed: 33,738,736
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 support vs support Counters
Presently there is insufficent games played by Karthus support on Patch 30 to determine the strongest support counters. A matchup requires a minimum of 100 games to be displayed.


Nami
the Tidecaller
Karthus wins against Nami 44.00% of the time which is 3.81% lower against Nami than the average opponent.
After normalising both champions win rates Karthus wins against Nami 2.72% less often than would be expected.
The average opponent winrate against Nami is 47.81%.


Leona
the Radiant Dawn
Karthus wins against Leona 44.19% of the time which is 4.53% lower against Leona than the average opponent.
After normalising both champions win rates Karthus wins against Leona 3.44% less often than would be expected.
The average opponent winrate against Leona is 48.72%.


Morgana
the Fallen
Karthus wins against Morgana 48.15% of the time which is 0.03% higher against Morgana than the average opponent.
After normalising both champions win rates Karthus wins against Morgana 1.12% more often than would be expected.
The average opponent winrate against Morgana is 48.12%.


Lux
the Lady of Luminosity
Karthus wins against Lux 52.67% of the time which is 3.53% higher against Lux than the average opponent.
After normalising both champions win rates Karthus wins against Lux 4.62% more often than would be expected.
The average opponent winrate against Lux is 49.14%.


Nautilus
the Titan of the Depths
Karthus wins against Nautilus 52.99% of the time which is 2.27% higher against Nautilus than the average opponent.
After normalising both champions win rates Karthus wins against Nautilus 3.36% more often than would be expected.
The average opponent winrate against Nautilus is 50.72%.