Hat throw as his grab.
Make the tornado his side special and give him the Poltergust for his down special.
Make him spit fireballs instead of a steady stream of fire.
Just make his forward smash the shoulder bash again, why did they even change that.
C O C O N U T G U N
Dual peanut popguns.
I'd just give him remote bombs and a regular boomerang.
Give her all the buffs... and a new down special.
Sword and magic.
Deadman's Volley. Completely redo him please Sakurai.
Make her more like Mega Man with projectiles for standard attacks.
Bring back the gliding mechanic and give it back to the appropriate characters.
Make Jumpglide her default recovery and just give her entirely new specials for the rest.
Get rid of the durability mechanic.
Bring back the Brawl hammer.
Bring back Brawl Meta Knight.
Bring back Waddle Dees.
Give him Wario's air speed and Arwing for a final smash.
Give the yoyo its hitbox back on charges.
Sparkly fairy effects?
Dark effects?
Give him more windboxes.
Reference Stack Up
somewhere in his moveset.
Give him a new game.
Bring back the squad, add Rock and Flying Pikmin, make his recovery the jetpack from Hey Pikmin.
Less janky hitboxes.
For the love of god get rid of all the lag on his attacks.
Give his sprite attacks (fruit/ghosts) 3D models and fix his useless grab.
Make him Classic Sonic.
Revamp customization.