Take away Neeko's ability to stopwatch her ult.
Her ult has a 40% slow, 250-650 flat dmg with a 130% scaling, 1.25 second stun
can't burst her down and punish her for jumping into the fight because she can just stopwatch the whole interaction. She shouldn't be allowed to do that much in a team fight while being completely invincible, the closest interactions to that would be a fiddle ult or a morgana ult, neither of which are as overloaded as Neeko's.
Fiddle's ult 125 / 225 / 325 (+ 45% AP) Morgana's 150 / 225 / 300 (+ 70% AP) 20% slow and 1.5 second stun after 3 seconds