Well, Rowan still sees himself as a kingdom citizen, at least during the beginning and on the low corruption routes, hence why he is so hesitant and feels guilty all the stuff he does during these times, so in his own head he is acting as a villain as he is harming his fellow countrymen.
I guess I don't fully understand your point here, you mean you can only be a villain if you are fully in control? Rowan and Alexia are completely at the mercy of the twins, they just don't have the power to fight back yet, but are still doing messed up things that harm the ones they used to protect so in my book at least they are still acting as villains even if unwilling.
Yeah, by the end a large portion of the world will probably have been pretty much screwed a la Rastadel, and you taking over to rule over the demons or sabotaging them at a crucial moment to destroy them will be the very last moves we make, doubt we will have separate wholesome campaigns by then.
