Help with Ahri's "role" in the game?

I mained Katarina and Master Yi for the past few years After half a million mastery points I understood that Katarina's way of winning games is through key teamfights by cleaning up And Yi is great at straight up taking objectives. I got to gold with him But now I'm trying to main Ahri, and it's great when you slowly scale up and help your team win fights and eventually just win the game, but what is it that makes her stand out? Where does she shine? After I understood what to do with Yi I hit Gold with an 80% winrate. I want to 'click' with Ahri as well to know what to focus on that really makes the difference between winning and losing. Thanks in advance!
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