Rosa
She may be a terrible mother but I've always liked Rosa for some reason.
Eva
I tend to like characters that are a bit bitchy. I also love Itou Miki's voice acting.
Ange
I never use to like her because I found her weak, bitter and delusional, somewhere along the way I started liking her for that
Battler
In the VN, his always angry-mode is rather tiring in the anime.