Fizz kit has similarities to J4, but stronger.
J4 only has 1 mitigation from his w shield, fizz has 2 with his double dorans-shield passive and playful trickster stasis.
J4 has 2 gap closers but one is long cd ult and the other takes 2 spells, Fizz also has 2 but both are short cd non-ults.
J4 does %current health damage that doesnt scale, Fizz does %missing health damage that does scale.
J4 has to trap himself with everyone including possible teammates in his ult for the cc to work, Fizz can ult from a distance to slow and knock up enemies, giving him the choice to follow up or not.
Obviously J4 isnt a bad champion, But it seems like Fizz is too good.
Fizz: "Shark week? Nah son, Shark life..."