There is a character that, like Narcisuss in the ancient Greek story, has an excessive, lasting, and obsessive admiration their own self-image and/or other attributes.

Notes:
"Pride" themes like "attitude of superiority" involve a character comparing themselves to others. Such themes do not necessarily mean that narcissism is implied. It is possible for a character, rightly or wrongly, to believe themselves superior and take pride in that supposed fact, without them obsessively and lastingly admiring themselves. To judge whether we describe a character as "narcissistic" we inspect the character's self-admiring behavior and gauge whether we think that they, like Narcissus did, could have behaved the same way when alone. If a character admires themselves habitually but in a way that is not describable as "obsessive" then the theme "vanity" is applicable.

Examples:
Garth of Izar suffered from delusions of grandeur in tos3x16 "Whom Gods Destroy".

Aliases:
narcissistic personality disorder, megalomania

References:
https://en.wikipedia.org/wiki/Narcissistic_personality_disorder https://en.wikipedia.org/wiki/Narcissism