Stella Livret can usually be found in the school Library. It's her favorite place to research, and nobody bugs her there. She tends to disapprove of Zoo and his antics, but secretly kind-of likes him. Zoo is more than a little intimidated by her- she's a braniac! And she certainly won't stand for being called 'Livret'.
But he will come to appreciate her more than you can imagine.
And she has a dog who does tricks.