Come on now, Paramount Pictures. If you're going to create an animated character which is so obviously based on Jack Gleeson, the very least you can do is ask him to play the role instead of handing the part to Chris Pine. That's very poor form! Jack Gleeson is, of course, famous for playing Joffrey in 'Game of Thrones,' who has to be considered one of the evillest characters in the history of television. Legend has it that when his character died, the cheers could be heard from space.
The character of Jack Frost in 'Rise of the Guardians' - which wasn't one of Paramount's finest hours - was ice cold from his control of the weather to his demeanor. With his fair hair and his thin, cruel smile, it looks like someone simply scanned Gleeson's head and put him in the film without paying him for it. Perhaps that's the real reason Gleeson has since walked away from the acting profession.