In theory I think it could go toe to toe with Potter (who'd have thunk we'd all want banshees on our shoulders?) except for maybe in the high end categories. Potter's style lends itself to ornate and intricate and expensive clothing items. Jewelry, hats, knit sweaters, etc...
I don't see that in Nintendo's portfolio. It would feel off brand. Like McD's doesn't offer real steak or sushi.