I really, really like it the most when Isabelle sings a new town tune. She sounds awesome! If that doesn't count, I guess I like Reese the most. She sounds better than the villagers I had so far.
wolves sound like tribal percussions and I like it
I can't stand the wha wha sound of cats and the brass thing for gorillas
I love the pan flute for sheeps
and the old synth sounds for the deers (this one in particular it's really 70s) and crocodiles
I find cute the squirrels and monkeys percussions
oh and the weird distortion of Katrina it's interesting too