If the Bates team are wanting a good all-rounder to take on the part, then Amanda Schull should definitely be in the running. Not only has she appeared in many top-rated shows across the board (such as One Tree Hill and Pretty Little Liars), she's also portrayed a variety of characters. Good grounding for Marion, who has a multi-faceted personality. Schull's versatility was demonstrated very recently, as she left overheated legal saga Suits and headed into twisted sci-fi territory for 12 Monkeys, where she became boffin Dr. Cassandra Reilly. She's as at home being glamorous in something disposable like Hawaii Five-0 as she is being up to her neck in test tubes for Monkeys. Her age would also be an intriguing factor. As a woman in her thirties she could easily fit into the category of "older" women that Norman has become involved with, at times fatally!