On the attacks:
Dtilt: Should have multiple button presses for multiple spins. Like, you press Down and A once, he spins once, but if you hold down and then hit A three times, he spins three times. If he spins more than once, he should fall down.
It's a good idea, is it necessary though? I like the falling down idea.
FSmash: Please don't make this Soul Siphon. I feel that would be much better as the move he does if you hot an attack button while grabbing an opponent. Forward smash should like his charged unblockable, <<B I believe. He holds the sword behind him, and then charges it. It's unblockable in the SC games. I think it would fit much better.
Do you know the exact name of the move? I don't want to change too much at the moment and I wanted the attack to be more original than just a sword slash.
USmash: There isn't one, unless I misread. Marth's USmash is probably pretty good as is for Yoshi.
Did I not do the Usmash? Oh well it is Crying Spirit Sword if you want to know, pretty much just Marth's Fsmash animation.
Throws:Except for Dthrow are all too powerful. They seem good, but their power is way too high.
I was going to give hima terrible grab range, but they might still be too powerful, would you suggest halving the damage?
Roll: If you could do this, it would be awesome. Have him able to teleport, but teleport 5-6 times before having to stop and then falling over. Each additional teleport should do 2-3% damage to Yoshi. I doubt this is possible though.
That would be so awesome, but I don't know. Would it be too good?
Dash: Ninja Blade Rush counter hit would be an incredible dash attack. If you're not sure what that is, it is where Yoshi basically goes through his opponent. It was one of my favorite moves in SCII.
I'll look it up in a sec.
Hope this helps, and I hope I can help some more in the future.