Fizz balance tuning ideas:
Numbers are just for example purposes:
REWORKED Nimble Fighter (Passive): Fizz ignores all unit collision.
Whenever Fizz basic attacks, for the next 2.5 seconds all damage he takes is modified by -10%(+5% per 100AP).
(This is to discourage AD / AD Tank Fizz with taking 10% MORE damage when he basic attacks for a short time, but if he builds ability power it becomes a positive effect of giving him damage reduction, everything past 200AP is a positive for this example.)
Playful / Trickster (E): Cooldown doubled. Cooldown halves if Playful / Trickster directly damages an enemy.
(This will open up a larger window to deal with Fizz whenever he uses his E to run away, should make him less obnoxious to play against this way offering more room to outplay Fizz. If a change like this resolves the frustrations of playing against Fizz correctly then there will be room to buff him in the future if for some reason he ever feels too weak.)