Well if we were to go through every game

FFI we have garland who wants to live forever, FFII we have an emperor who wants to rule everything, FFIII I'm not really sure, the story was never completely clear to me when I played it, hopefully this will be fixed in the DS version, FFIV, honestly Zeromus was trying to clear the planet for his people to live because that was their original idea, FFV, the void to destroy everything, FFVI, insane and actually does rule over the world, FFVII, wants to clean the earth of the impure and restore it to the ancients and make the promise land, FFVIII, wanted to control everything including time and be all powerful

and blah blah.

If you want to truly go with evil, Zeromus is suppose to be evil like the actual spirit of evil. When you beat him he says as long as there is evil I will live in the hearts of people. And the point is that because he is pure evil, there has to be good in people. SO technically, Zeromus is the definition of evil, because he is the incarnation of evil.... that is all

THE JACKEL