Marta Acosta, author of "The She-Hulk Diaries" and "Dark Companion," is not the Latina Terry McMillian. Nor is she able to perpetuate stereotypes or preconceptions concerning what it means to be a woman writer, a Latina writer or a woman of color. However, the humorist can astonish with compelling fiction, which touches upon everything from vampirism to the blue collar chip on her shoulder.