While he won't say too much about his character's arc this season, fans "will definitely see more Greyjoy-ness" in season six. Season five ended with some redemption, as he and Sansa Stark jumped from the wall at Winterfell to escape from the evil Boltons.
Game of Thrones creators David Benioff and Dan Weiss have described the upcoming season as the hardest but best.
The showrunners were hesitant to describe season six as the best season yet, however, they did say there is not a single weak episode.
"We're always reluctant to say it's thebest season yet because so much of that is in the eyes of the beholder," Benioff told Entertainment Weekly.
"And Dan and I are so close to it that its impossible to be unbiased. But that's my sense - watching them all together now - this is the best one we've done."