I suppose I should make a potential moveset. Sounds fun.
Jab: In both KH and KHII, Sora has a standard three-hit jab. They're slightly different from each other, but either would be fine.
F-tilt: I like the idea of Vortex. Dodge Slash could work as well.
U-Tilt: Either Slapshot or Upper Slash. Knocks people in the air for aerial combos.
D-tilt: Sliding Dash akin to Mega Man's down tilt.
F-Smash: Blitz, Guard Break, or Zantetsuken would be awesome. Maybe even Gravity Break.
U-Smash: Ripple Drive.
D-Smash: Explosion is so perfect. I considered Stun Impact, but that may be a bit overpowered. Vicinity Break could also work.
Grab and Pummel: Sora grabs and hits them with the hilt of the Keyblade.
F-Throw: Sora throws them and quickly casts Ragnarok, the lasers hitting them as they fly.
U-Throw: Sora throws them up with Aero.
D-Throw: The reaction command Fail-Safe for the Assassin Nobodies would be perfect. Sora jumps and spins around before throwing them downwards.
B-Throw: The Dancer Nobodies fling you around and throw you, I thought it would be funny if Sora did this.
N-air: Hurricane Blast or Aerial Finish would look cool. Aerial Dive, despite its name, could also work.
F-air: Horizontal Slash is great.
U-air: I've been trying to come up with something, but I can't. So, I'll just say Magnet Burst.
D-air: It is a ground move in KHII, but Finishing Leap could work in the air. I'd like if it meteored.
B-air: A backwards version of Aerial Sweep.
Neutral Special: I thought maybe a Peach-style order of Fire, Blizzard, and Thunder.
Side Special: Strike Raid is just so perfect here.
Up Special: I thought maybe Glide. I really can't think of anything else. HMK suggested Air Slide. Perhaps a Flowmotion move.
Down Special: I've seen people suggesting Reflect here, I kinda think Reflect would be better as Sora's shield. I feel Ars Arcanum would be cool, something similar to Marth's Dancing Blade.
Final Smash: I've seen people debate back and forth on whether his Final Smash should be Final form or Trinity Limit. Now, I know that Trinity Limit requires Donald and Goofy, but not in Re:Chain of Memories (yes, I know they're cards). I think that version would work best as his Final Smash. Final Form would be okay, but I personally like Trinity Limit more.
Idle Animation: Sora sits in his typical stance. Looks left to right. Holds up the Keyblade in front of him.
Block: Sora surrounds himself in Reflect while performing his Guard animation.
Spot Dodge: A non-attacking version of Dodge Slash.
Sidestep: Dodge Roll.
Airdodge: Aerial Dodge.
U-Taunt: I like willj803's idea of a potion. Throws it up saying either, "This should help," or, "There."
S-Taunt: "How'd you like that?!"
D-Taunt: Fist pump. Animation from Olympus Coliseum.
Victory Animation 1: "That's the power of the Keyblade!" Spins Keyblade around and puts it over his shoulder, from Olympus Coliseum.
Victory Animation 2: "What'd you expect?" Confidently pats his chest.
Victory Animation 3: "My friends are my power!" Scene from KH3D.
Losing Animation: Sora cheerfully claps for the winner.
I went for a more ability-oriented moveset. I just thought of moves that would translate well into Smash.