Because you like Captain Hook in Peter Pan
Victor Frankenstein can create life, so he's pretty awesome if he says so himself. See them in Frankenstein.
Gilderoy Lockhart's biggest idol is himself. See them in Harry Potter Series.
Buddy Pine is an unhinged superfan of superheroes using technology to take down his idols. See them in The Incredibles.
Born and raised in the darkness, Bane is determined to have the city totally under his control so that he can demolish it. See them in DC Extended Universe.
This cannibalistic villain may be a loner, but Killer Croc doesn't have problems with self-confidence. See them in Suicide Squad.
Billy Batson is a troublemaking teen grappling with a pretty weird superhero identity crisis See them in DC Extended Universe.
Ursula will oh-so-generously grant your wishes for a price. See them in The Little Mermaid.
Thanos is an intergalactic warlord, on the hunt for infinite power. See them in Marvel Cinematic Universe.
A smart, spunky, and incredibly skilled gamer, Art3mis has a revolutionary spirit. See them in Ready Player One.
Aladdin is a street-thief who is on his way up. Way, way up! See them in Aladdin.
Baloo is a fun-lovin' bear who just needs the bare necessities of life See them in The Jungle Book.
There's nothing "demi" about this demigod's massive ego. See them in Moana.