Yup, that’s the one I meant.
Main character snuff would be a tricky and controversial manoeuvre in any fandom. As for adherence to or departure from the canon... knowing precisely what is plausible or not, knowing what fictional characters would do or not do, knowing what is going on inside the fictional characters’ minds – those are exactly some factors that make someone a fan. Nobody will be surprised that fans don’t always agree.

Original characters give more creative freedom though.
Quite apart from the copyright isssue if it comes to publishing for profit.