Is Fizz toxic?
Yes, but it is not just Fizz that is the problem.
The entire assassin class (more specifically the subcategory of safe assassins) is designed to tilt people, be toxic, and feel unfair to play against.
I main support specifically so that I have the most power in the game to make assassin players suffer.
Some assassins have well defined weaknesses, but they are few and far between.
has a horrid early game, and is easily shut down if she can't get a kill early into a teamfight.
has the worst early game out of all champions, and needs several items to be relavent.
is a fucking marksman with the playstyle of an assassin. He is almost completley immobile, is squishy as hell, and can do nearly nothing to stop people from getting on top of him.
has low scalings, so pretty much has to build MPEN tank. She is heavily reliant on her cocoon, which is not that hard to dodge. Rappel does not exactly provide godlike mobility.
if she does not snowball, she has NO chance. Her passive is powerful, and with enough items she can succeed, but if she gets put behind she will be useless for the rest of the game. Oh, and pink wards. Those exist.
Then we have champions who actually see play.
all follow the same fucking formula
"You are decently safe with your innate slipperyness, your damage is high pretty much all game, and if you get ahead you instakill the enemy before they can even react. You feel unfair to play against, but its all outplays. Definatley outplays."