Which champion is the hardest to play?

He's... interesting. Sure, he doesn't do anything complicated, but that's the thing. He's so unorthodox from most champions that I can't play him effectively.

To be serious about this. Draven. The amount of management of his axes you need to have to consistently keep up his damage output is very astounding. Anything can happen that can make you drop your axes and get you blown up in a fight. I've tried playing him quite a few times and even knowing what I'm supposed to do to catch his axes reliably, I still suffer a lot without extensive practice on him. But there's hardly a reliable way to get practice on Draven without just going into normals due to any situation that can arise when juggling your axes.

and ofc are the big ones I can think of.

those are my two choices, not sure about whos harder then who.

Really depends on player skill/preference.

The most common champions that take a ton of mastery include Lee Sin (Quick warding), Syndra (ball management), Draven (Axes), and Azir (Sand Soldiers range)

: If you play him, you aren't actually playing League of Legends.

In terms of mechanics, have ridiculous skill floors that you have to climb over to even achieve mediocre results.

Any of them when my cat is in front of the monitor.