Oh, totally. I have a whole sketchbook of stuff devoted to one of my characters. I drew her, her room, her with each of her love interests (from different stories! She always has a different name, a slightly different personality, and a different love interest. And she's usually a different age, like in my first RPs with her she was 5 going on 6, and now she's barely 14.) I write stories with her, because she's the only character I haven't scrapped completely in the last four years. So yeah. Whole sketchbook and notebook for one character. :)