He is actually nothing like his TV character and was one of the most courteous people on set. Once the cameras stopped rolling, Gleeson would apologize to extras he had to berate while playing Joffrey.
Says costar Pedro Pascal (Oberyn Martell), “He is one of the most gentle, intelligent, courteous, thoughtful people that I have met, like in life. He’s a really, really special guy. He’s also really smart. He’s one of those people that, despite them being much younger than you, you’re like, ‘This guy’s smarter than me. Just accept it.’”
I enjoy that he’s a good-natured, humorous, kindly fellow. Especially because his character was pretty much satan incarnate.