From Literature:
* Mr. Toad from Kenneth Grahame's "The Wind in the Willows": Toad is an impulsive, egotistical character with a constant need for excitement. He frequently pursues harebrained schemes, often with disastrous consequences.
* Wile E. Coyote from "Looney Tunes": A clever, but perpetually unlucky coyote who uses elaborate, overly complex inventions to catch the Road Runner. His schemes are always doomed to fail.
* The Red Queen from Lewis Carroll's "Alice's Adventures in Wonderland": An erratic and demanding ruler whose whims and bizarre pronouncements make her seem both childish and self-centered.
From Film and Television:
* Austin Powers from the "Austin Powers" franchise: A self-proclaimed international man of mystery with an eccentric personality and outdated catchphrases. He often relies on outlandish gadgets and ridiculous schemes.
* Bart Simpson from "The Simpsons": A mischievous and rebellious young boy who frequently gets into trouble with his outrageous antics and disregard for authority.
* Professor Farnsworth from "Futurama": A brilliant but absentminded and often selfish scientist who frequently invents bizarre and impractical inventions.
From Mythology and Folklore:
* Puck from William Shakespeare's "A Midsummer Night's Dream": A mischievous and pranksterish fairy who delights in causing chaos and meddling in the affairs of humans.
It's important to note that these characters are often portrayed as comedic figures, even when their actions are misguided or harmful. Their childishness and self-centeredness are played for laughs, but they can also be seen as a cautionary tale about the dangers of impulsivity and self-absorption.
Let me know if you have any other details or specific qualities you'd like me to consider!