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: 52,856,571
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 bottom Counters
Presently there is insufficent games played by Karthus support on Patch 30 to determine the strongest bottom counters. A matchup requires a minimum of 100 games to be displayed.
Jhin
the Virtuoso
Karthus wins against Jhin 41.35% of the time which is 5.17% lower against Jhin than the average opponent.
After normalising both champions win rates Karthus wins against Jhin 1.09% less often than would be expected.
The average opponent winrate against Jhinis 46.52%.
Jinx
the Loose Cannon
Karthus wins against Jinx 43.09% of the time which is 4.64% lower against Jinx than the average opponent.
After normalising both champions win rates Karthus wins against Jinx 0.53% less often than would be expected.
The average opponent winrate against Jinxis 47.73%.
Ezreal
the Prodigal Explorer
Karthus wins against Ezreal 43.18% of the time which is 7.03% lower against Ezreal than the average opponent.
After normalising both champions win rates Karthus wins against Ezreal 2.88% less often than would be expected.
The average opponent winrate against Ezrealis 50.21%.
Miss Fortune
the Bounty Hunter
Karthus wins against Miss Fortune 44.34% of the time which is 3.20% lower against Miss Fortune than the average opponent.
After normalising both champions win rates Karthus wins against Miss Fortune 0.90% more often than would be expected.
The average opponent winrate against Miss Fortuneis 47.54%.
Kai'Sa
Daughter of the Void
Karthus wins against Kai'Sa 45.20% of the time which is 3.04% lower against Kai'Sa than the average opponent.
After normalising both champions win rates Karthus wins against Kai'Sa 1.08% more often than would be expected.
The average opponent winrate against Kai'Sais 48.24%.