Megalomaniac

n. one who suffers from megalomania (delusions of grandeur and power)

Megalomania (from the Greek word μεγαλομανία) is a psychopathological condition characterized by delusional fantasies of wealth, power, genius, or omnipotence - often generally termed as delusions of grandeur. The word is a collaboration of the word "mania" meaning madness and the Greek "megalo" meaning an obsession with grandiosity and extravagance, a common symptom of megalomania. It is sometimes symptomatic of manic or paranoid disorders.
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Noun
1. a pathological egotist
(hypernym) egotist, egoist, swellhead

megalomaniac /'megəlou'meiniæk/
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MEGALOMANE