It's safe to say that all the Game of Thrones characters have been through a lot over the past few seasons, and some of those changes can be seen with side-by-side looks at the characters then and now. Some of the characters' evolutions are more obvious, like that of Arya and Sansa Stark, who have grown up since season one. For others, like Jon Snow and Jaime Lannister, it's a matter of what they've endured and the scars they've quite literally earned from facing battle after battle. Compare the Game of Thrones characters from season one and season four.
The Game of Thrones Characters, Then and Now