"POWER! UN-LI-MI-TED POWER!"
— Emperor Palpatine's famous line (showing his intense megalomaniacal personality).
Megalomaniacs are evildoers who are obsessed with power and are similiar to Dark Lords and Evil Rulers in that they seek to dominate everything but are more concerned with power than actual conquest: despite having the word maniac in the name it does not mean they are always clinically insane. However a Megalomaniac will often commit outrageous acts such as hold cities for ransom, kidnap presidents etc in order to demand outrageous claims of power.