If you created DMC4, how would you?

[DemonSlayer6]

Say for instance you got the opportunity to create everything in DMC4, how would you?
A few tips:
Vergils comeback
Neros relation with Dante
Lady

 

[Vergilissexy]

More Vergil, more Sparta, and more Eva. ^^

 

[UltDeadpool]

I would expand on Sparda's story, mostly fill in some plot holes.

 

[DemonSlayer6]

Me too.
I think that Sparda was the most powerful in the game... but is dead...
So I also guess that Spardas power should be in vane...