My keep priority:
1- his E. To me, this is what I get the most mileage out of. His only sustain, and respectable damage.
2- his ult. He had it before sion. It's frequently misused in solo que, but skills that reward teamwork and communication benefit the game.
... although I would like to see his ult cast directly on enemies to punish enemies that rely too much on one hypercarry.
Neutral
1- Q, good staple skill. The speed boost would be a lot more helpful between activation and the attack rather than between when the attack lands and the ghoul dies.
2- passive. I like the current one, makes AD items more cost effective, and helps the ghouls last longer... but I'm open to something else. Without the HP from this, the ghouls would have to be rebalanced as well... maybe a set duration instead of being limited by degen?
Only thing I'd really like to see changed is his W. AoE slow is nice, but it doesn't seem cost effective to me. Maybe a ranged ghoul or a ghoul you cast on allies (or yourself) to act as a buff rather than primarily damage.