Who is a childish and self-centered buffoon who brings various unusual schemes and contrivances to everyday tasks?

The description fits the character of Wile E. Coyote from the "Looney Tunes" series. He is known for his elaborate and often absurd schemes to catch the Road Runner, using a variety of contraptions that frequently backfire. His childish determination and self-centered nature often lead to humorous failures, highlighting his role as a comedic buffoon.