FIX FIZZ
Fizz is by far the worst champ IMO. Fact that he can become untargetable every 6 seconds with an ability that does massive damage and closes distance is stupid. Also, that it negates whatever damage is currently on him is also stupid. Vlad becomes untargetable but still burns from ignite. Kassadin has a flash type ult but doesn't become untargetable. Where is the consistency? When I play tristana and try to rocket jump to safety, i can get kicked by lee sin midair. Fizz just doesn't seem to follow any of these rules. He's basically low risk and high reward. 1 kill lets him snowball into a monster that can turret dive people without fear because his E also protects him from turret damage. His Q procs on hits so he doesn't need to put any work in to proc Lich bane. His W has a bleed and after 2 seconds, allows him to do 3x damage. His R has long range and a knockup but he still doesn't even need his ult to kill teams. It's just so frustrating that RIOT lets him get away with all of that and I can't figure out why especially when they decide that other champions need nerfs here and there like Ahri even though she has low base damage and needs a full combo plus ult to kill most people later in the game.
Make fizz not be untargetable and that will open him up to more counterplay. Remove the damage from his trickster or reduce it.