Big supporter of decloning Ganondorf and adding Black Shadow.
Would just like to elaborate on what could be done with Black Shadow.
He could be kept as close as possible to Ganondorf but still have unique animations.
Either Forward Smash or "Warlock Punch" should be him crouching down then headbutting forward (charging like a bull). Maybe "Wizard's foot" could be a forward dive as well. A charged up "punch" would still be true to the games though:
https://youtu.be/iEoIM6Vwonw?t=17 . Cover people grabbed by him with electricity to represent that cutscene.
Up Throw should definitely be a throw followed by a jumping headbutt (other characters have animations like that)
Any of the other throws could be a very weak throw with fixed knockack, followed by an explosion when the character stops moving, to represent the Story Mode Chapter 6 from F-Zero GX (go too slow and a bomb goes off).
Up Smash, Down Smash, Down Tilt, Neutral Air and Up Air could be "spinning" kicks (with the same trajectory as Ganondorf's current moves), with a red trail around his feet, to represent the spin attack from F-Zero X, GX and Climax.
The red trail could also be used for stationary moves to represent the "side attack". In general I imagine his attacks being very "flashy".
Like Captain Falcon, his attributes could represent his character just as well as his moves. Give him a very high dash speed (faster than Falcon) but noticeably slow acceleration. Long lasting grabs (including Up Special) could represent his "A" rated grip, as would better ledge characteristics (even things like how long he can hang on the ledge before he automatically drops). "Snaking" could even be represented somehow.
I always imagined him being the sort of character who'd use Landmines and Drone Cars as attacks, or even take the extradimensional elements of Deathborn, but it's not really necessary. Melee Ganondorf with a few subtle F-Zero nods would be enough.