Dennis Reynolds is one of the owners of Paddy's in Always Sunny in Phildelphia.  Dennis owns the bar along with his childhood friends Mac and Charlie.  Dennis comes from a very privileged upbring thanks to his rich father Frank.  He definitely peaked in high school where he was considered popular.  Despite graduating from the University of Pennsylvania, he seems content to run Paddy's his whole life.

Dennis Reynolds Quotes

With real power comes real responsibility and I don't want any of that shit. I just want the money and the illusion of power. And puss.

Dennis

Dennis: I am having feelings again. Like some kind of fourteen year old kid. You remember, feelings right?
Mac: Yeah. I have feelings every single day of my life.
Dennis: Do you?
Mac: Are you saying you don't have feelings?
Dennis: What I'm saying is a built up a shell.. a shell around myself. A cold, calculated shell that couldn't be broken by anything but marriage.

It's Always Sunny Quotes

Mac: Bro, when you tack on mass, you sacrifice flexibility. That's just a straight up fact
Charlie: That's insane. Touch your toes.
Mac: What am I a gymnast?

No I don't eat dragon, cause, uh, it's not a meal for peasants, it's a meal for kings, and I'm sort of a common man. But they don't eat us, it's a common misconception. They actually eat gold and treasure -- that's why they're always sitting on a pile of it.

Charlie