Qiyana, Akali, and Irelia
So, this isn't going to be saying they're broken or underpowered. Just a little discussion about how the issue Irelia and Akali have is for certain going to be a problem for Qiyana as well thanks to the similar style of her kit.
What's wrong, and the reason they got nerfs to the point their overall WR's are near 46%, is that they're actually too easy to master. Akali and Irelia see win rates of 55-57% after only 50 games, when other mechanically difficult champions like Lee Sin or Azir don't see that kind of success until 150 - 200 games.
And it's because they're slightly different. Their mechanics are just as difficult, but once learned lack the same decision making that Lee's, Zed's, Azir's, Kat's, etc. do. Their choice of position matters less since it isn't strictly tied to their damage abilities like Zed's shadows or Kat's daggers, and they don't need to position around moving the enemies like Lee or Azir.
So they trade off a little versatility, a little damage in some areas, in exchange for more consistent strength and ease of mastery. That's why they never reach as high as 60% at the highest levels of play, but have such consistent high performance among people without really enough games to be considered mains, but enough to have learned their unique mechanics.
And it seems Qiyana has exactly the same style of kit. So my guess is she'll get the same treatment.