Since I'm currently 1/2 way through watching Full Metal Alchemist, Ed and Al's mother comes to mind first of course. I like how she's shown so positively in their memories, like the time they make little statues for her. No wonder they are so devoted to her even after she died.
Kagome's mom on Inuyasha both amuses and annoys me. If my daughter came and said, "Hey I found this portal into the past, so I'll be hanging out there in my free time." I would be saying, "You're taking me with you 'cause I want an adventure too!"