Honestly this might be a bit controversial, but I want some drastic changes to Ness.
Let me list them:
-Ness' yo-yo should reach further than it did in Melee and Brawl by just a small bit for both his up and down smash. It should come back roughly as quick, if not quicker.
-Give Ness' forward air and running attack more range.
-Ness' down air should be reverted back to the Smash 64 down air with the meteor smash and all. It should come out a bit slower than in 64, but have less after lag (sans when it it Z-cancelled in Smash 64).
-Ness' neutral B should go farther and function as a KO move the longer you charge it. It should be somewhat similar to how it functions in Project M, only it should move farther faster, and not KO really well until it is charged for a longer period of time. The longer it stays out though, the slower it should be able to move as time goes on.
-Have the "customized moves" fr Ness' neutral B (PK Flash) be a strong yet very slow moving version of his PK Flash that KO's very early (like a powered up version of the Melee/Brawl version of the move). Have the other version of it be where the moves emits energy have, and dub it PK Rockin.
-Have Ness' PK Fire function mostly how it does in Project M. Maybe have it tower up a higher flame to control spacing more.
-Have the customized moves for Ness' forward B become the 64 version of PK Fire (where it does like somewhere around 8-10% outright), and a Shoryuken-esk version of it where it fires like a ball and go straight but slow (have that do about 4-6%) to the point where you can combo and control space with it.
(I'd conversely give Lucas a move like PK Freeze in PM with an "aiming" variant as well as a freeze effect variant)
-Make Ness' down B (PK Shield) have a shine-like effect when it hits a foe, but have it just be a straight-forward side pushing effect when this happens.
-Have one for the down B be PK Hypnosis where Ness creates a slightly barrier than PK Shield and any foe touching it is Hypnotized. The other variant of the move can be PK Paralysis where Ness creates a fairly larger barrier and any foe touching the barrier moves 50% slower for a few seconds or until next hit with a move that deals 5% or more.
-Change Ness' up B entirely to PK Teleport. Have it be kinda like Pit's new up B mixed with Mewtwo's teleport. Have it start out with Ness running forward (you can angle it up or down slightly) and then teleport decently far. However, if Ness runs into an object while running, he can't wall tech, and his body turns black from the smoke/flame.
Also, give Ness' PK Thunder to Lucas as a PK Thunder variant for Lucas.
-Have Ness' up B first variant be the quick spinning teleport that damages foes badly who are caught in the middle of the circle, although it doesn't travel as far. Have the final up B variant be Ness doing a just a straight running teleport that you can control moreso than the default teleport.
-Change Ness' Final Smash to a super attack with his friends Poo, Jeff, and Paula.