Poll Of The Week #38

Over the course of the shows 5 seasons and 6 years of episodes, we have seen many changes in the characters of the shows’ personalities and we have seen their progression as well. There are many points in the show where massive and small events have changed these characters in the past, present and maybe even in the future. So what character do you think has changed the most since their introduction into the show and maybe in the comments you can say why you think it is that character, and if they changed for better or for worse. P.S. I wish I could put more than 5 options in a poll; sorry for the inconvenience. :)