1) Neeko is _really_ over tuned.
2) Shes intended to be an APC.
3) She needs a couple changes.
Her Q is fine as it is, due to it having a requirement to deal most of its damage.
Her E is fine as it is.
Her W needs some... changes. Id love to see her three hit passive moved to her actual passive due to how important it is to her kit, and her mimic moved to her W. Her passive scaling could also stand to be reduced some, 0.3 or so.
Her R needs its ratio reduced to 0.8 on the damage, i think. Its base damage and the shield makes a 1.3 ratio way to strong, even if the ability is meant to be an APC ult.