Ganondorf: Tennis Ball of Doom. Maybe he can use a weapon too, but some new kicks and punches would do just fine.
Yes, this. Ganondorf should have been in Wii Sports Tennis, btw.
Wolf: Anything but a Landmaster.
Give him a Wolfen?
Falco: See Wolf. Give him a different Side B too. It's still a little too similar to Fox's.
They are too similar. I think I'd change his up Special, though.
Lucas: Swap his shield for PK Love I guess.
You mean Down-Special?
Luigi: Poltergust for throws. Works kind like DDD's B attack.
Just keep his Back throw, and I'm happy.
As for non-clones
Mario: Let him use the Hover Nozzle in mid-air. That was the best thing in Mario Sunshine. Also give him a special attack he can only use while gliding with his cape. It seems like a cool idea, and it'd be a more accurate reference to Mario World.
This is pretty cool, but a tad OP.
Donkey Kong: Give him his roll. You don't see heavy characters with quick attacks often.