Charlie

Someone who claims to have done everything and thinks they know everything but is constantly wrong and annoys everyone.
Someone who thinks they've accomplished things and takes credit where no credit is due.
An assistant manager that is really just a glorified secretary.

Someone who thinks they are better than they are.

You built one Lego castle. That doesn't mean you have a background in mechanical engineering. You're such a Charlie.

Thomas Edison improved that light bulb, but he couldn't have done it without Charlie telling him how.

Guy thinks he's an alpha now. Bro, he's so beta he's a Charlie!