Azir change to passive

When you think of azir, what separates him from most, if not all, champions in the league? His soldiers that he commands! So, every skill he has are about his soldiers in some way. Q Lunging Soldiers, W Cast Soldiers, E Dash to Soldiers, and R soldiers that push back enemies. What's missing from his kit? His passive ability which at times can be really good but I believe it can be changed in a way to affect him or his soldiers. (which is what riot is going for, true champion identification and difference in play-style).

I still dont know what change would make azir, "azir, the emperor of sands"

Maybe...

Azir has 5% dmg reduction per soldier out? but this doesnt seem too specific in his kit.

or.

When azir has 3 soldiers out or maybe the fourth time he casts?, his next spell will be empowered? q lunge further and thickness widened, w attack range and cast range increased, e causes knock up but he goes through target, r causes soldiers to spear the area ahead of them causing aoe dmg?

What are your thoughts?