One question, answered from the books
What champion should I main?
Pick a champion whose committed mains actually sit at the top, then stay on it. The numbers on all 173 champions are on the Best Champions To Main list; the current top five are Rek'Sai, Bard, Zoe, Nidalee and Taliyah. The other half of the answer matters just as much: if you already love a champion, main that one. Enjoying the game keeps you queuing, and games played is what actually makes you better.
The decision, as a picture
What the numbers say
Most tier lists tell you what's strong this patch, which changes every two weeks and never helped anyone pick a champion to stick with. A better question: how many of the players at the top actually main this champion, against how often the world plays it? That can be counted. Take every Challenger and Grandmaster main in Korea, Europe West and North America, divide by how many games the whole world plays of that champion, and adjust for bans.
The results are lopsided. Malphite is played over 900,000 times a patch and has exactly one high elo main across all three regions. Rek'Sai is played 86,741 times and has seventeen. Per game played, that's roughly 180 times the high elo mains per game played. The champions everyone plays have almost nobody at the top maining them.
The current top five by main density: Rek'Sai, Bard, Zoe, Nidalee, Taliyah. The full ranking covers all 173 champions, with the method and its limits in plain English, and every champion has its own page with the raw numbers.
The concept: commitment works, but choose where
Maining works because repetition turns decisions into habits. The same clears and the same matchups, game after game, until the reads come free and your attention goes to the map instead of your buttons. Every champion you add to your pool divides those reps. That's the case for one champion, or at most a small pool with one main.
But the data says where you commit matters. A champion that a million people play is a champion your opponents already understand, and the crowd drags the density down. The champions with room at the top are the ones few people bother to learn. That's where the list points, though it's a comparison rather than a promise; it tells you where committed players end up, not your personal odds.
One honest caveat, and then the rule. The data starts at Master and counts accounts rather than people, so treat the thin end gently. And the rule that beats the whole list: if you love a champion, play it. This page is for players who haven't picked yet.
"Popularity is not viability. Malphite is played 922,790 times and has one high elo main. Rek'Sai is played 86,741 times and has seventeen."
Best Champions To Main