What if Fizz was given the Cassiopeia treatment?
Cassiopeia's passive give her a movespeed buff that increases with her level. In return for this ability she cannot buy any boot item.
Do you see where I'm going with this?
Let Fizz keep his E but make it so that his cannot buy Zhonyas.
Cassiopeia is locked out of boot items because giving her bonus movespeed and allowing her to buy boots would be insane, espeically if she got ahead, because you have a terrifying basilik that you can't run away from in you game. Unfortunately this also means that she misses out on the unique bonus' that this boots can provide (namely, Mercury Treads for Magic Resistance and Tenacity, Ninja Tabi for Armor and taking less damage from auto attacks, and Sorcerer Shoes for magic pen).
This is balanced for Cassiopeia because she is trading a not so valuable item for a passive that mostly makes up for it AND another inventory slot for another item.
Fizz would be trading a really valuable item for an equally effective (if not MORE effective) ability. He wouldn't be able to pick up a Zhonyas, but he has an ability that has a MUCH lower cooldown, plus movement, damage, and even a slow. The item slot would be filled by another item which couldn't posses CDR, AP, and AR all at the same time.
What do you think?
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in there. You get the ultimate glass cannon.