We have only ever had the string family, guitars, and I think saxophone? And then the keyboards. I want to be able to make a full orchestra. Give me woodwinds. Give me brass. Give me an accordion. I literally want to turn my house into Wii Music 2. Give me a synthesizer where the different variations are different sounds. Give me the theremin back (although not the way it worked in NL, that was gross).
Also more instruments to hold would be super fun. I can only dream of waltzing (or I guess marching, rather) around my town with a sousaphone
I wish furniture could be more interactive ie the climbing wall if villagers/your character could actually climb it. stuff like the jelly trampoline, etc in pocket camp.