Ooh, I really like the Mewtwo-esque floating. Anyway, here's my take:NiGHTS will also float along the ground rather than walk, much like Mewtwo, and his dash consists of Drill Dashing across the stage.
Walking animation: Gotta go with the Mewtwo idea.
Jump: NiGHTS jumps about as high as Link, but with the basic flying animation from JoD
Double-Jump (Air-Jump): NiGHTS again uses the Link jump height, but the second jump is the "acrobatic" (?) flying.
A: Standard attack, like a punch or something
<A>: Slightly more powerful than the above--a kick?
A^: Uppercut or similar.
Av: Foot-pedal, Snake style.
B: NiGHTS throws a Mario-style projectile... it's a Blue Chip!
<B>: Peach-esque hip smash (Dash?)
B^: Dash-move up
Bv: Dash-move down (midair) or l/r (platform)
Side-smash: Falcon PAWNCH-style punch, but with Ideya colors glowing around the fist.
Up-smash: Same as above, but in different direction
Down-smash: NiGHTS does a spin-kick thing on the ground, with similar effect to Link's or ZSSamus's down A.
FINAL SMASH: A Visitor runs up to NiGHTS from across the screen. They Dualize... the end result is a massive Paraloop.
Intro Animation: NiGHTS is air-dropped (so to speak) onto the stage by a Nightmaren, but the cage collapses.
Home Stage: Twin Seeds