What If Mordekaiser Q was quicker version of Aatrox Q?
What if he could cast it 3 times with the first 2 being a cone shape and the last being a rectangle shape. Like Aatrox, the end of the hit box would deal extra damage plus an on-hit effect. The cast delay would be less as morde doesn't have a mini dash like Aatrox. Since he has no CC or mobility, the extra range from a skill shot Q would help.
I also think his ult should summon a predetermined unit like Yorick based on the type of champion he killed with it.
Ex. Kill an ADC and summon his own ADC.
Kill a mage and summon his own mage. Kill a tank and summon his own tank.
This would get ride of some of the bugs like 4th shot jhin ghost if he has his own units he can summon.