Which units would you like to replace/add?

Some are humans (like Markel, for example). As for the units, I think the ghosts need to be toned down a bit, as they are too powerful...

Markel might be a human, or he might be a vampire, or even a Lich, since he was Sandro's student (if I'm not mistaken), and Sandro probably taught him how to disguise himself as a human; otherwise, Markel would have been banned. And ghosts are like Russian roulette – you either hit or miss :D