Instead of turning Neeko into the next Zoe...
So if you don't know about the new champion, Neeko, she does quite a bit of damage, and it would seem overpowered to keep her like that. Instead of completely derailing her damage as a burst mage, there's a simple solution to keep her fun but balanced.
Her q (
E, but it can recast up to 2 times if it kills a minion or hits a champ)
Her w (
passive)
Her e (
Q, however it passes through everything and speeds up when hitting multiple units)
her r (
ult without the long channel)
So you can imagine how "easy" it is to throw her E at a wave, root the champion and throw your Q R for all that damage.
Instead of deleting all that damage, q damage should be reduced based on how many enemies it hits.
-It fixes her ability to farm easily, since the q procs on minion death. You would have to time it precisely to accommodate for the damage reduction per unit. -It makes it less rewarding to hit empowered E. Since E is empowered when hitting units, Q won't do as much damage to champions in their wave, especially with electrocute. -E by itself is still "moderately difficult" to hit without enemy units, so it still retains the reward of catching out an enemy champion and dealing full q damage alone. -Since her E can root multiple enemy champions, her q would deal less damage in team fights but it still opens the opportunity for her ult, which is already very strong.
Long story short, E Q combo is overpowered during laning and and teamfights, but making Q damage based on amount of enemies it hits is balanced.
Edit: Keep in mind that this is only to address her combo damage, and not mana use, speed, or any of the other stats.