A buff to sing at least (characters sleep longer, less endlag, etc). Singing is jigglypuff’s whole thing as a character, it needs to be viable, darnit!
Things that combo into rest at high percentages. (like jab reseet)
Leaping rest needs to grab ledges. That would just be amazing.
Pound doing a liiittle bit more shield damage would be great. I haven’t shattered anyone’s shields in so long, even if I hit them, just because it’s huge and recovers so fast.
Up-air needs more knockback. Its range is awful with Jiggly’s stubby arms but landing it isn’t satisfying enough.
Can’t think of more atm!