I liked Andrea more when she wasn't trying to be tough, but after Amy's death, she attempted to be a badass and fell majorly short. And I didn't think I would like Daryl when he first showed up in S1 because I just thought he'd replace Merle, but he quickly became my favorite. Michonne is pretty awesome, but I have to say I was kinda sad when she had to kill her walkers because I thought they were hilarious and a brilliant idea.
Also, a friend of mine sent me this and thought you all might find it amusing:
Click for T-Dog Memorial