Should You Main Yuumi? Tier F
Yuumi is tier F for maining. Only 0 of its mains are Challenger or Grandmaster across the three major regions, against 414,768 games played worldwide.
Reviewed for League of Legends patch 16.15.
Verdict. Nobody has taken Yuumi above Master as a main in Korea, Europe West or North America this season, across 46 tracked mains.
The numbers
Score 0.00 high elo mains per 100,000 games played, ban-adjusted · 0 Challenger · 0 Grandmaster · 46 tracked mains in KR, EUW and NA · 414,768 games played worldwide · 4.50% pick rate · 3.30% ban rate
What this means
From the video: Vambient's breakdown, lightly cleaned from speech
So, this is a champion that has zero challengers and also zero GMs as mains. I think this one is a master tier and stop there kind of champion. You don't see it at all in higher MMRs.
It's not really picker ban. But yeah, it's not going to be too great of a champion.
How this was measured
Two numbers, one division. First, how many players are currently in Challenger or Grandmaster maining this champion in Korea, Europe West and North America, from onetricks.gg. Second, how many ranked games the entire playerbase plays of this champion worldwide across every rank, from op.gg. The result is high elo mains per 100,000 games played, then reduced by the champion's ban rate, because a champion you cannot pick is a champion you cannot main.
This is not a win rate list and it is not a patch strength list. It measures availability-adjusted high-elo main density: how much Challenger and Grandmaster main representation a champion has relative to how often it is played. It is not the probability that maining this champion will get you to high elo. The score counts Challenger and Grandmaster mains only, drawn from a tracked pool that starts at Master; it does not include the Chinese server, and it counts accounts rather than people, so one dedicated player with several high elo accounts shows up more than once. Patch 16.15. The full plain English explanation, including everything this list cannot tell you, is on the main list page.
Popularity is not the signal. What matters here is how densely high elo mains appear relative to how often the champion is played.