Egomaniacs (also called narcissists) are individuals who suffer from narcissistic personality disorder. They have a delusional sence of self-worth and are NOT the same as an Arrogant Villain, though many people do confuse them - in simple terms an Egomaniac is obsessed with themselves and believes they should be the centre of attention, an object of worship/reverence and so forth. Many megalomaniacs are egomaniacal as they are certain attention-seekers.