Yes Yes Yes times 3679. I absolutely agree. This would be fantastic. I REALLY hope that Iron Galaxy does this. There has been a ninja shaped void in this game for too long. Although Jago is very cool, he does not really count, he is more of a monk with a face plate thing. Without that face plate there would be nothing about him that would make him a ninja. Sadira could possibly count, (that is, if she had her old design that I spoke of in this post) but an actual genuine shinobi would elevate this game to a higher plane of reality.
As for suggestions of mine, for appearance, I agree a more futuristic look would be cool, but a more normal style would work too. The peeps at Iron Galaxy are very good at making cool designs, so I have no doubt that whatever they decide on it would be cool.
For gameplay style, this hypothetical ninja should definitely have an izuna drop. (Spinning upside down pile driver) That is a token ninja move right there. Shuriken are a must, but not just the typical star shaped kind, there are dart needle nail shaped ones too, such as these.
Another cool tool that ninjas were known to use are caltrops.
They were thrown or placed on the ground to injure and slow down pursuers. I think Erron Black from Mortal Kombat X uses these. They could be used in a similar way to that.
And if this ninja did not use a sword, the weapon could be knives or kunai in a simmilar way to how Hazama uses them in Blazblue.
And maybe the ninja could use poison or something like that. Ninjas were known to use poison a lot. And a slash dash like Chipp Zannuf’s Alpha Blade would be nice.
But anyway, I do not think requests for specific moves would go that far. It is more the overall idea of adding a full on ninja that might convince Iron Galaxy to do this, if it is requested enough.