Is there any figure in movies more familiar than the animated critter who talks like a human? From “Bambi” to “The Lion King” to “Ratatouille” to “Zootopia 2,” perky anthropomorphism is at the heart of most animated films. So when I say that the central character of the new Pixar movie, “Hoppers,” is a mouthy beaver named Mabel (voiced by Piper Curda), that may sound like the cuddly quintessence of animated business as usual. You could call Mabel an eager beaver — and you could also call her righteous, testy, impassioned and wonderstruck.