I'm watching for the first time and find myself laughing more now than when Diane was in it, I also am one of the few who likes Carla, her barbed comments make me laugh, but my favourites are Norman and Woody.
I like Carla as well.
She's someone who has been dealt a tough hand in life, and had the misfortune to cross the path of Nick. She has a huge sex drive - hence the kids - and covers a lot of vunerability with a vey acerbic tongue.
Norm was, and remains, my favourite character. A man content to accept a life with simple pleasures - especially when he can afford them.