Perfect fix for fizz. Actually tho.

A little while ago blitzcrank was nerfed because his overdrive (speed boost) gave him little opportunity for weakness as I was always up and spammable with no real consequence. They added a slow to the end of its effect to make up for this.

The same could be applied to fizz, after trollpole, make his incoming damage from champions and towers increased by 1000-1000000000%.

But seriously this would be unique way to fix him while still retaining his core identity. No nerfs to his damage or mobility, he can still "dodge" spells and damage but there is room for counter play and giving him a clear weakness.