Well, it was kind of a stupid thing to show a toddler, and I only did so because I couldn't think of any other way to entertain her and it was the only dual-audio series I had on my hard drive at the time.
You'd be surprised at how perceptive they can be, though. She likes Big O and can sorta follow the plot of an episode, even if a lot of the character relations (e.g., Roger and Angel) go over her head. But being a kid, of course, she mostly likes the trite and simple "believe in friendship!" shonen stuff.