The Gryffindor Fat Lady guards the CR portal and sometimes walks out of her frame to visit various sections of the CR. Sometimes you will see the Gryffindor ghost, Sir Nick lamenting about his near-headlessness. Finally there is Apollyon Pringle who was the former caretaker of the Gryffindor Dorms. The dorms were demolished and the towers arose in their place. Mr. Pringle is cranky waiting for them to be finished and has taken up temporary residence in the CR. Just don't mess with his floors or hide illegal pineapples. That drives him crazy.