I've been thinking about how Samurai Goroh could be incorporated, and I picture him borrowing elements from SSB64 Captain Falcon, and some of Ike's moves as well. (If we have to narrow it down to already existing characters to clone from).
If another F-Zero representative is required, and a different type of swordsman to boot, why not the futuristic Samurai, rival to Captain Falcon, and 2nd most important character of the franchise?
Moveset ahoy, I'll cover the specials first:
B: Stingray Sword
>Goroh will hold his katana over his head, "charging it" like the Falcon Punch, and 1,5 seconds later, he swings down fiercely with it.
(This covers a semi-circular area above his head) *Uses Ike's Fsmash as animation*
B>: Quickdraw
>Goroh will charge forward and swing his sword. This attack will send the opponent flying diagonally over Goroh's back. So even if it doesn't work like a Meteor smash (as C.F.'s does) it still kind of gimps the opponent. *Uses Ike's Btilt animation*
Bv: Fire Sting
>Goroh dives straight down with the katana and pierces the ground. This move works in two ways.
>Hits opponents on air: This will cause burning damage, as well as having spike properties. *Uses Link's Dair as animation*
>Hits the ground: If Goroh misses an opponent on air, when landing on the ground, the katana will cause blazes to rise up from the ground. *Uses Ike's Bneutral for animation*
B^: Boost Power
>Goroh will perform a long, vertical only, lightning-like boost upwards while spinning horizontally with his sword (sort of like Link's) It causes drill damage (like Metaknight's B-tilt) *Uses a much faster version of Link's Bup as animation*
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If you're still interested/reading this, I'll cover real quickly how the rest of his moves would work:
A: (Heavier Captain Falcon 64, does not initiate automatic punches
Atilt: (Ganondorf's Melee Ftilt)
Adwn: (Ike's Dtilt)
Aup: (Sumo stomp version of Captain Falcon's Utilt)
DashA: (Lightning quick version of Ike's dash, with slightly longer cooldown)
Fsmash: (Captain Falcon 64's Burning kick)
Dsmash: (Captain Falcon 64's Sweep kick to both sides)
Usmash: (Captain Falcon 64's Elbow smash)
Nair: (Sex kick)
Fair: (Heavier double kick)
Dair: (Quickdraw slash down)
Uair: (Reverse version of Captain Falcon's Uair, more similar to P:M Sonic's Fair)
Bair: (Quickdraw slash behind, slow start up, fast execute with much better range than Falcon's)
Grabs can work exactly like Captain Falcon's