Gagalump
A person named Carter who thinks they're the most important person in the world, but everyone else just ignores them
Carter walked into class and said, 'I am the most important person.' No one even looked at him.
Carter said he was the most important person. I said, 'Yeah, and I'm the most important pizza.'
Carter kept telling everyone he was the most important person. I said, 'You're the most important failure.'