Yes, in general, fictional books within a story are italicized. This helps to distinguish them from the rest of the text and shows that they are a specific work within the narrative.
Yes, italicizing is a very common way to denote the title of a graphic novel in modern writing. It gives a clean and professional look compared to underlining.
In MLA, comic book titles should be italicized. This helps to distinguish them from regular text and indicates that they are a distinct work. It's a standard formatting rule to make the citation clear and consistent.
It depends on the style guide you're following. Some style guides recommend italicizing short story titles, while others might have different rules. Generally, though, italicizing is a common way to set the title apart.