Robin is played by Lino Facioli, who has also starred in Get Him to the Greek. He was just 11 when first cast in GoT, and his last appearance on the series was season 6 episode 4. A lot has changed since then.
WARNING: This article contains Game of Thrones spoilers.
If there's one thing you should take away from the Game of Thrones finale, it's that Robin Arryn, Lord of the Eyrie, pulled a Neville Longbottom on us and had a serious glow-up in between seasons. Amongst the drama of the show's final episode, Twitter users noticed Lord Arryn - who once loved the moon door and was still being breastfed by his mother Lysa, was present at the council meeting where the nobles decided who would be the ruler of Westeros.
And he looks very different now!