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.
All Ranks Champions Analysed: 15,303,630
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 support Counters
Presently there is insufficent games played by Karthus middle on Patch 14.13 to determine the strongest support counters. A matchup requires a minimum of 100 games to be displayed.
Leona
El Amanecer Radiante
Karthus wins against Leona 38.52% of the time which is 9.58% lower against Leona than the average opponent.
After normalising both champions win rates Karthus wins against Leona 6.45% less often than would be expected.
The average opponent winrate against Leonais 48.10%.
Nautilus
El Titán Abisal
Karthus wins against Nautilus 45.58% of the time which is 4.24% lower against Nautilus than the average opponent.
After normalising both champions win rates Karthus wins against Nautilus 1.10% less often than would be expected.
The average opponent winrate against Nautilusis 49.82%.
Thresh
El Carcelero Implacable
Karthus wins against Thresh 46.98% of the time which is 3.22% lower against Thresh than the average opponent.
After normalising both champions win rates Karthus wins against Thresh 0.08% less often than would be expected.
The average opponent winrate against Threshis 50.20%.
Lux
La Dama Luminosa
Karthus wins against Lux 48.88% of the time which is 0.88% lower against Lux than the average opponent.
After normalising both champions win rates Karthus wins against Lux 2.26% more often than would be expected.
The average opponent winrate against Luxis 49.76%.
Lulu
El Hada Hechicera
Karthus wins against Lulu 51.96% of the time which is 2.37% higher against Lulu than the average opponent.
After normalising both champions win rates Karthus wins against Lulu 5.51% more often than would be expected.
The average opponent winrate against Luluis 49.59%.