Fizz's hitboxes need fixed
First, his own hitbox. When I was actually playing the game it looked like the stun went right through the center of his character model, which needless to say made me pretty ticked. https://i.imgur.com/qbBbJ9Y.png?noredirect Even if this is one of those cases where he dodged by a single pixel or something, you've got to admit that hitbox is bound a lot tighter to the champion than most. Think about any champion you play, and I guarantee that if that spell was that close to your model you would have been stunned.
Now, contrast how close that stun was to his ultimate here: https://i.imgur.com/klV0w4S.png?noredirect I'm a good ways away from it, every visual indication says I'm fine. If my hitbox is as snug as Fizz's hitbox, I just have to walk out of the knockup circle... https://i.imgur.com/KkvLhmS.png?noredirect ... or not.
At the very least Fizz's ult needs a red circle around it to indicate how wide the hitbox really is, ideally that hitbox needs to be shrunk. And can we get more consistent hitboxes on champions too? If I missed every stun that was that close it would be one thing, but this is the only time I've seen a stun not connect when it was touching a champion like that.