There is almost nothing I would want to change about ZSS. Not only is she ridiculously sexy and SAMUS, but I love her entire moveset.
-Smashes: Super fsmash range gives incredible spacing, dsmash has a ton of damage and combo potential that is wicked, and her upsmash is just plain awesome.
-Dash attack: Fast, and links into tilts so well!
-Tilts: Uptilt hits both in front, behind, and above you, all of them setup well are fast and have good range.
-Aerials: omg possibly best aerials in the game. Fair, Bair, Uair are amazing damage(17% on the fair!!) and all three of them can kill. Nair has deceptively large hitboxes, speed, and most of all is very easy to hit with, and Dair changes your momentum! Transfer your momentum vertically and then cancel it with a dair, and survive like a heavyweight! At first I didn't like dair, but not after this.
-Specials: Ok, a stungun, two moves that do incredible damage, one KOs like crazy and the other whips them back towards you from out of the air, and finally a third jump, autowall-jumping with a spiking sex kick with amazing knockback power.(crazy low % spikes THROUGH WATER and like KOs off the side non-spike at 100%).
-Mobility: Not only is she literally fast on the ground, she also jumps very high very quickly, she can walljump, AND crawl!
-Recovery: It's a tether, but it's actually amazing! With a well above average second jump, a horizontal third jump, and both the longest(and that makes them quite long) vertical and horizontal tethers, and they all can be used in any order with no loss or general stun!
-Her grab and throw: Her grab is ranged, has an easy time picking up people out of the air, and most of all is actually really fast to come out! Not to mention, her throws are all really good and setup very well for many different things. The only drawback is that *if* she misses her grab, it's quite laggy.
So with all of that, what can I possibly want different? Very little, just three things:
-Her jabs. Her jabs simply suck, they don't even combo into themselves at any %, so it's very easy to get hit during your own normal AAA combo. I wish this was different.
-Her voice. It's not done right! We need the real voice actor.
-Her shorthop. If she had a lower shorthop Zamus would likely be god-tier. As it is, she has a high shorthop which doesn't let you use your aerials on a grounded opponent as you could possibly manage otherwise.