Its kinda late, but I'll try and make some suggestions.
Ftilt- Brings up ring barrier and does a horizontal swiping motion. Has a few frames where it reflects projectiles.
Dtilt- Trips them with his ears, lul.
Uair- Volleyball set(He did have a volleyball spin-off game).
Nair - Instant kick similar to Luigi's nair that pops them up(Doesn't kill) and only lasts a short while instead. Would go good with a floating recovery.
Dair - Either the nair idea Starwaffle posted or a dair like Yoshi's except Klonoa hovers slightly and the dair pops them upwards a bit.
Bair - Double sequence attack, first hit is his ear, second hit shoots a slightly ranged ring blast and blows them backwards. Chains like Snake's nair.
Usmash- Similar to Mario's Usmash or Peach's Melee Utilt, a headbutt where Klonoa hops slightly.
Dash Attack - A skid or slide of some sort that looks nice when canceled into his Usmash.
Side-B - A float/hover that moves him horizontally and can cancel into different things. It can cancel into an aerial or a grab where he footstools the opponent down, much like Diddy's side-b.
Up-B - Maybe when he throws down a moo, it can randomly be one of the exploding creatures that explode after a set time.
Neutral-B - Ring bullet projectile. Can be used in the air and shoots diagonally, knocks them upwards on contact.
Down-B - Wind Sword or hammer attack.
Maybe more some other time.