I heavily agree on the no spin, homing attacks.

You could probably just give him a gun and call it a day, this is Shadow.

While there's not much at the moment, he has a great deal of potential. You could find a lot of inspiration from his Battle movelist, such as his Divekick for a Down-aerial, his jab being the first three hits of his ground combo, his Side Special being the snap move that can function similarly to Din's Fire, etc. One of his smash attacks could even have Rouge assist him, like I've seen a Sonic do with Shadow and Knuckles.
Of course, there are other games he's been in. You could probably incorporate Chaos Spear as a Neutral Special projectile that does no knockback if you were to rapidly use it. The longer you charge, however, the farther it will travel and the stronger it will become.
If there are any sprites of his Sword from Black Knight out there, that could make for a great Smash or Aerial, but that's just me.
This is all I have to say on this Shadow for now, but I think this should provide some ideas.